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Username Post: Need help finding correct 1995 tbi 454/4l80e harness pinout        (Topic#347411)
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
09-29-17 07:22 PM - Post#2709253    

i have google searched for weeks and no one seems to have the correct pinout for a 1995 tbi with the 454/4L80E, i have found the 305,350 pinouts and they are similar but not close enough.

I specifically need help with the transmission harness that comes down, i have 3 connectors for speed sensors and (after saturday) have 3 to plug into.

I know the general consensus is that gm did not have a ISS AND OSS on the 1995 4L80E, BUT i have both, and with them both connected as i do right now i was able to shift from 1st to 2nd but due to a bad 2-3 solenoid i never got past 2nd gear. I am ordering those solenoids tomorrow but im sure they wont arrive until late next week anyway.

I do have a DRAC module attached to my PCM bracket, but i did not know to get the connectors for it because i was under the impression at the time of purchase that it was only responsible for speedo and cruise control signal.

That being said I have followed the entire harness i recieved and cannot find the connectors so they must have still been in the truck, so i am assuming they pass through the firewall with the bundle of wires on the drivers side??? but not sure which ones.

I am to understand that the DRAC does the above functions but also converts the square wave from the VSS on the tcase to an AC sine wave for the PCM and helps it compute shift points and determine if there is any slipping in the trans that shouldnt be.


Now back to my issue, i have the following wires and connectors running to the trans (besides the 2 primary connectors, which ive already verified are working)

(pics are attached for reference of which connectors im talking about)

Coming out of the main wire loom for the transmission:

Red with black stripe and blue with white stripe, twisted pair, has 2 pin type "A" connector, and i believe this to be the ISS since i can follow these 2 wires directly to the PCM connectors.

Green with white stripe, and purple with black stripe, not stranded and used to have a 2 pin type B connector but now has the type A instead so i could connect it to the OSS.

Now there is a 2nd batch of wires coming down from the main harness, im not sure if they are even supposed to be down here or not

3 wire connector:

brown
tan w/black stripe
grenn

2 wire type B long enough to reach right next to the trans:
Green w/white stripe
purple w/black stripe

and lastly a 2pin type A and it is pretty far up there like only reaches a hair past the exhaust manifold

green w/white stripe
purple w/black stripe

the last one is really hard to see but im 90% sure those are the correct colors.


I am beginning to suspect the 2nd run of wires arent even supposed to be down there and just followed the trans loom when i put it in the truck, and the 2nd set of wires coming out of the transmission loom go up to the firewall and are supposed to go to the DRAC, but dont know how to wire that up, i previously traced something all the way back to the PCM but dont remember anymore and dont have any of my notes either.

2 Pin type "A"


2 Pin type "B"


and the 3 pin:



1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
09-30-17 06:38 PM - Post#2709319    
    In response to MuddiGGer25

busy weekend? lol usually i get one response overnight

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
stumppuller 
"7th Year" Gold Supporting Member
Posts: 819
stumppuller
Loc: Canada
Reg: 11-01-04
09-30-17 06:41 PM - Post#2709320    
    In response to MuddiGGer25

Now this is bringing back painful memories. I have a mountain of diagrams I used to figure this out. Just wish I had kept it organized.

My information is from converting an 81 K20 with a 350/Muncie 4spd to TBI fuel injection using everything from a 1992 C1500. I then installed a 4L80E using a 1994 4L60E harness which I converted to work, as well adding the wiring so I could use a 1996 K1500 gauge cluster.

Some background info...

The 4L80E was first used in 91. The 91-93 PCM received 2 speed inputs from the transmission, the ISS and the OSS. It also required a VSS which was supplied from the DRAC (yes, 1991 didn't yet have a DRAC, don't go there)

In 94, the PCM was changed and now only required an ISS and an VSS.

Now, here's where it begins to get fuzzy. After 93, on a 2WD, the 2 sensors on the transmission case are used. The fwd one is the ISS, and the aft one is the VSS. The VSS supplies the DRAC, which then provides the speed output for the PCM and Speedo.

Now 4wd. Nothing, and I mean NOTHING, seems to address the fact that the output speed is supplied from the transfer case sensor. The wiring diagrams seem to leave almost all details of this out. Basically, after 93, the ISS is still used to supply the PCM, the Transfer Case sensor is used as the VSS and supplies the DRAC, which then supplies the PCM and Speedo. The transmissions OSS is not used.

As for your questions, the type A connector is for the ISS. The Type B will either plug into the Transfer case VSS, or plugs into a short jumper harness that then reaches the VSS. The other connectors should plug into a shift sensor on the top of the transfer case, and a harness plug that exits the Transfer case "floor shifter" on the cab. If the truck has electronic shift transfer case, they may also be for that.

I have detailed info about the DRAC...somewhere . What would really help is if you can provide me with the PCM's number. Then I will know what pinouts are for what. Also, is this a transplant into your truck? A project? Just helps to know what it's from, and what it's going into.

-91 Sierra C2500, now K2500
-81 Chev K20


 
stumppuller 
"7th Year" Gold Supporting Member
Posts: 819
stumppuller
Loc: Canada
Reg: 11-01-04
09-30-17 06:44 PM - Post#2709321    
    In response to MuddiGGer25

  • MuddiGGer25 Said:
busy weekend? lol usually i get one response overnight



Hey, I can only type so fast. You logged off 3 minutes too early


-91 Sierra C2500, now K2500
-81 Chev K20


 
stumppuller 
"7th Year" Gold Supporting Member
Posts: 819
stumppuller
Loc: Canada
Reg: 11-01-04
09-30-17 08:23 PM - Post#2709334    
    In response to MuddiGGer25

And..... you have mail.

It was too much to post here, so I sent your e-mail a PDF for the DRAC, as well as everything for a 1994 7.4L

At quick glance it looks as if your harness wire colors may be different. As long as the PCM connectors are Red and Blue, just do a continuity check of the unknown wires back to the PCM connectors, then make the color corrections on pages 8A-24-9 and 8A-24-10 to match what you have. The PCM connector colors are specific to compatible PCM's.

I sent what I thought would be relevant, just let me know if there's anything else you need.



-91 Sierra C2500, now K2500
-81 Chev K20


 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
10-01-17 07:33 AM - Post#2709363    
    In response to stumppuller

  • stumppuller Said:
Now this is bringing back painful memories. I have a mountain of diagrams I used to figure this out. Just wish I had kept it organized.

My information is from converting an 81 K20 with a 350/Muncie 4spd to TBI fuel injection using everything from a 1992 C1500. I then installed a 4L80E using a 1994 4L60E harness which I converted to work, as well adding the wiring so I could use a 1996 K1500 gauge cluster.

Some background info...

The 4L80E was first used in 91. The 91-93 PCM received 2 speed inputs from the transmission, the ISS and the OSS. It also required a VSS which was supplied from the DRAC (yes, 1991 didn't yet have a DRAC, don't go there)

In 94, the PCM was changed and now only required an ISS and an VSS.

Now, here's where it begins to get fuzzy. After 93, on a 2WD, the 2 sensors on the transmission case are used. The fwd one is the ISS, and the aft one is the VSS. The VSS supplies the DRAC, which then provides the speed output for the PCM and Speedo.

Now 4wd. Nothing, and I mean NOTHING, seems to address the fact that the output speed is supplied from the transfer case sensor. The wiring diagrams seem to leave almost all details of this out. Basically, after 93, the ISS is still used to supply the PCM, the Transfer Case sensor is used as the VSS and supplies the DRAC, which then supplies the PCM and Speedo. The transmissions OSS is not used.

As for your questions, the type A connector is for the ISS. The Type B will either plug into the Transfer case VSS, or plugs into a short jumper harness that then reaches the VSS. The other connectors should plug into a shift sensor on the top of the transfer case, and a harness plug that exits the Transfer case "floor shifter" on the cab. If the truck has electronic shift transfer case, they may also be for that.

I have detailed info about the DRAC...somewhere . What would really help is if you can provide me with the PCM's number. Then I will know what pinouts are for what. Also, is this a transplant into your truck? A project? Just helps to know what it's from, and what it's going into.



I will have a link to my public facebook photo album for this project, it will be the last few photos in there with the PCM and DRAC numbers, and you can see most of the wire colors to compare to your notes.

Its a 1988 V20 suburban that used to have the 6.2L J-code, I pulled that due to lack of torque for what i needed because i got a heck of a deal on a 1995 454 TBI and 4L80E with harness and PCM all for $350 (sold the 6.2 and th400 for $300)

the donor truck was a 1995 K2500HD 4x4. had a np241c (drivers drop) but i didnt buy it because it wouldnt work for a squarebody.

I "Was" using an NP208 but something broke internally when my GCW was somewhere around 20K-22K lbs.

I pulled a NP241 passenger drop from a 1991 V1500 and just spent yesterday swapping to a 32 spline input shaft so it can go on the 4L80E.

Also the 80E has a GM rebuild metal label thing showing a rebuild in 04 IIRC.



  • stumppuller Said:
  • MuddiGGer25 Said:
busy weekend? lol usually i get one response overnight



Hey, I can only type so fast. You logged off 3 minutes too early




lol sorry had a looooooooong day could barely walk by the time i logged on so i just bumped it and logged off lol

  • stumppuller Said:
And..... you have mail.

It was too much to post here, so I sent your e-mail a PDF for the DRAC, as well as everything for a 1994 7.4L

At quick glance it looks as if your harness wire colors may be different. As long as the PCM connectors are Red and Blue, just do a continuity check of the unknown wires back to the PCM connectors, then make the color corrections on pages 8A-24-9 and 8A-24-10 to match what you have. The PCM connector colors are specific to compatible PCM's.

I sent what I thought would be relevant, just let me know if there's anything else you need.





I did get your email, i replied, and i will definitely let you know if i need any other diagrams, but since i already had it running and driving and averaging 8mpg towing 12,000lbs in 2nd gear ( 2-3 shift solenoid is bad) i think everything except the o2 sensors is working correctly. might even hook up the electronic cruise control now that i have a VSS and know how to wire the DRAC


the pcm number is 16197427 and the DRAC is PYH

https://www.facebook.com/MudiGGer25/posts/1021 2260...

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
10-16-17 07:05 PM - Post#2711068    
    In response to MuddiGGer25

Alright, so i ohmed out my wires, of the 2 stranded pairs one ran directly to the PCM which im sure is the TISS, my TOSS is currently disconnected, idk if it even puts out a signal but its there, no wires to connect to anyway.

The second pair of stranded wires went up to the firewall connector on the drivers side, i snipped them and spliced it into the DRAC, and the other end into the VSS on the TCASE which was working 100% when removed from the donor 91.

i used several pinout pictures and PDF's i found online to determine which pins are which and used 4pin CPU fan connectors in lieu of the $60 GM pigtail.
Tcase needs to be topped off but here are my results.

(its on jackstands for these tests)

In N the tires spin slowly, as if partially engaged.

I move the selector to OD then you feel and hear the engine bog for a second as it engages, i tried D position also but no change.

Brought the engine up to 4,000RPM (on my 6" supertach3) and switched between OD and D but did not feel a shift nor did the tires visually speed up.


My current shifter linkage only allows me to do P R N OD and D, it wont go far enough to get to 2 or L.

I can hear the solenoid click if i leave the IGN on and manually ground out the wire for the A or B shift solenoids.

I was considering disconnecting the linkage and try shifting to L and up one gear at a time because i read that if you start in L you can override the PCM and force shifts when the VSS is malfunctioning.

After work tomorrow I am going to figure out which pins are for the CEL and for the ALDL connector (im pretty sure its there under my dash) and try and check for codes but im sure that will be limited due to it being OBD1 in 1995.



Anyone have troubleshooting pages or steps to check the outputs from the VSS, DRAC, and TOSS?

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
10-17-17 05:35 AM - Post#2711108    
    In response to MuddiGGer25

also i will be biting the bullet and buying a usb to aldl cable from reddevilriver on his ebay page: http://www.ebay.com/itm/GM-OBD1-Scanner-C able-Soft...

i will probably have to just swipe the data port from the 1991 v1500 burb and wire it in myself, no biggie.

Atleast now i can datalog on this truck, and my wifes 95' and my 94 gmc mini-jimmy.

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
stumppuller 
"7th Year" Gold Supporting Member
Posts: 819
stumppuller
Loc: Canada
Reg: 11-01-04
10-17-17 11:12 AM - Post#2711150    
    In response to MuddiGGer25



Attachment: DTC_72_-_VSS_Circuit_Loss_Pg1.jpg (329.93 KB) 8 View(s)




Attachment: DTC_72_-_VSS_Circuit_Loss_Pg2.jpg (275.61 KB) 8 View(s)




Attachment: DTC_74_-_TIS_Circuit_Pg1.jpg (213.91 KB) 10 View(s)




Attachment: DTC_74_-_TIS_Circuit_Pg2.jpg (227.46 KB) 8 View(s)




Attachment: DTC_81_-_2-3_Shift_Solenoid_Pg1.jpg (281.02 KB) 7 View(s)




-91 Sierra C2500, now K2500
-81 Chev K20


 
stumppuller 
"7th Year" Gold Supporting Member
Posts: 819
stumppuller
Loc: Canada
Reg: 11-01-04
10-17-17 11:14 AM - Post#2711151    
    In response to stumppuller



Attachment: DTC_81_-_2-3_Shift_Solenoid_Pg2.jpg (266.87 KB) 8 View(s)




Attachment: DTC_82_-_1-2_Shift_Solenoid_Pg1.jpg (275.56 KB) 7 View(s)




Attachment: DTC_82_-_1-2_Shift_Solenoid_Pg2.jpg (261.2 KB) 7 View(s)




Attachment: Range_Switch_Circuit_Check_Pg1.jpg (296.24 KB) 7 View(s)




Attachment: Range_Switch_Circuit_Check_Pg2.jpg (262.45 KB) 7 View(s)




-91 Sierra C2500, now K2500
-81 Chev K20


 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
10-17-17 06:33 PM - Post#2711179    
    In response to stumppuller

thanks for those, ill get em printed off. ended up running errands and got distracted and it was way dark by the time i got out there.


I did remove the shift linkage and put it manually into L and it most definitely shifted down to 1st, and back to 2nd when selected but the tire/driveshaft speed did not increase when put into 3rd or OD with engine speed roughly 2,000-3,000 ( varying with my foot) regardless if it was functioning properly it would have grabbed 3rd if possible. I will check for the incoming A/C voltage from the VSS on the tcase and check the power and ground too.

I could manually get it into L/1st gear as many times as i wanted so it does not appear to be in "limp" mode as that is supposed to force it into 2nd gear only. i will obviously know more once i get the SES light wired in tomorrow and follow the flow chart.

I still will order the ALDL to usb cable so i can see real time data too

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
stumppuller 
"7th Year" Gold Supporting Member
Posts: 819
stumppuller
Loc: Canada
Reg: 11-01-04
10-17-17 06:51 PM - Post#2711180    
    In response to MuddiGGer25

  • MuddiGGer25 Said:
definitely shifted down to 1st, and back to 2nd when selected but the tire/driveshaft speed did not increase when put into 3rd or OD




Getting the SES light working will make your life a lot easier. But, with that additional information, here's another chart for you to look at...


Attachment: ATSG_Troubleshooting_4L80E.jpg (322.79 KB) 7 View(s)




-91 Sierra C2500, now K2500
-81 Chev K20


 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
10-17-17 07:10 PM - Post#2711183    
    In response to stumppuller

Well i was impatient and went out and checked all the new wiring for the DRAC and lo and behold i was only getting 1.1V DC on the switched power wire i chose (it had full 13.8V yesterday, so ill have to figure that out)

I got around 5-6V AC on the TISS at idle and bringing it up to around 1500rpm brought it to around 9V AC i also checked the VSS on the Tcase going into the DRAC and i got about 11V AC at idle and it increase when i brought the RPM up (both test done with truck in gear.

I then checked the ground. good.

When i found that i was only getting 1.1V on the DRAC power feed, i ran a quick jumper to the alternator output (i know not the smartest idea) and the idle came up as soon as that was connected. i tried disconnecting it and the idle dropped, then reconnected it and the idle went up again.


I know my shift linkage only will go to 2nd gear right now because its about 2" too short, but that being said i brought the engine up to around 4000rpm just for a moment (didnt want to piss off the neighbors) and then back down to idle and i moved the shifter to 2nd gear and it most definitly shifted back to 2nd and slowed the wheels down. I was able to repeat this 2 times before i shut off the engine.

Tomorrow I will clean up my wiring mess with weatherpack butt connectors now that i know i have the right wires connected, then fix that low voltage issue, and get the SES and data connector wired up. then i will probably take it for a spin up the block, its a 35mph road so that should get me to 3rd gear for sure if its working.

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
10-26-17 10:57 AM - Post#2712237    
    In response to MuddiGGer25

well as my other post says, i must have wired something wrong since it wants kill the engine every 5 seconds only when in gear, but runs normal when the DRAC is disconnected or in P & N.


I gotta replace the oil sender which has to wait until payday next week, because it wants to piss oil all over the driveway. right now just doing more research and gonna give it another go next weekend.

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
10-29-17 09:31 PM - Post#2712649    
    In response to MuddiGGer25

well i made a discovery, as i was finishing parting out the 1991 V1500 suburban i discovered a DRAC module near the steering column, basically directly below the radio location. i unbolted it and saved as much of the wires as possible (almost 2 feet worth)

Now i am partially confused because everything i have ever read says that the buffer should have been built into the speedo in the cluster. albiet its been removed and sold so i cannot verify, but i do know its a MN V1500 with a 5.7L/700r4/np241 combo. 3.73 axles so might just use the DRAC i pulled out because according to this chart: https://www.4wheelparts.com/off-road/gear-ratio-t i...

3.73 with 235/75r15 (stock size) 29" tires is 2809RPM.

4.11 with 265/75r16 (current size on v20) 32.5" tires is around 2805RPM, which would make the calculations near perfect for shift points.


I just need to find a correct pinout for the 1991 speed buffer so i know absolutely for sure which pins need to go where and my V20 should be ready for a oil pressure sender and for a drive down the street.

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
10-29-17 09:41 PM - Post#2712650    
    In response to MuddiGGer25

well i think i found what i needed after a couple google searchesL i downloaded this PDF and on page 88 has the pinout for RV chassis DRAC module: http://www.73-87chevytrucks.com/techinfo/7387CKMan...


Ill check the colors and pins from the harness and donor DRAC and post back

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
10-31-17 07:17 PM - Post#2712881    
    In response to MuddiGGer25

well update, wire colors matched and only connected 1 of the 2 speed buffer inputs to the pcm, but it doesnt try to cut out when put into gear anymore.

I got a line on a 1996 extcab k3500 with a 6.5l and 198,000 for under $1500 but needs some work and its been bedlined so i lined up a buyer for tomorrow to buy my 88v20 project and finish it and a bunch of extra parts for his other squares.

making a new post for the 96'

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
MuddiGGer25 
Contributor
Posts: 191

Age: 27
Loc: Fargo ND
Reg: 01-25-16
12-26-17 09:40 PM - Post#2719074    
    In response to MuddiGGer25

update, buyer backed out, seller wanted to trade, changed his mind, so i bought the 96 on payments and waiting for warmer weather to play with the 88. might be pulling it to replace the 6.5l though not sure yet. but last time i messed with it, i still only get it to shift 1st and 2nd gear manually, no 3rd or OD but cannot verify anything until the SES is wired up and the ALDL connector for data stream

1994 T15 Jimmy 4.3LCPI/4L60E 170K 3.42s (DD)
1988 V20 Suburban W/1995 454TBI(32PSI)/4L80E/NP241 CA truck, 125K G80 14SF/ GM10 4.10's
1995 K1500 ECSB 5.7 TBI/4L60E, 3.73s 269K(wifes)
1996 K3500 ECLB DRW 6.5L TD 3.73's 198K (new project)



 
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