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Username Post: My 700R4 will not shift        (Topic#283795)
cware 
Forum Newbie
Posts: 20

Loc: Norman, Ok
Reg: 06-15-12
07-08-12 03:13 PM - Post#2245797    

I have a 66 Biscayne that I recently purchased. It has a 400 from a 75 Monte Carlo with double hump heads and .501 comp cam. It is bolted to a 700R4 that I was told was rebuilt with less than 100 miles on it.

I was driving the car around a few days ago and it stopped shifting from first. It just revs to about 3k rpm. If you let off the gas and then get back on it the car wont actually pull for about 1-2 seconds. Before this it seemed to shift fine with the only issue being in overdrive. While cruising in overdrive, when you give try to accelerate at part throttle the car would buck and shake but it would clear up only if you either let off the gas or gave it full throttle. I assumed it was the torque converter. I did some research and found that it was possibly te TV cable needing adjustment but after doing so it would still not shift. I even tried manually shifting it and that does not work either. Reverse works fine FYI. Is this tranny simply done?
1966 Biscayne 2 door


 
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Allan In NE 
Frequent Contributor
Posts: 1555

Reg: 12-27-11
07-08-12 04:27 PM - Post#2245817    
    In response to cware

Check the governor.

Allan
Lifelong GM automatic transmission specialist


 
cware 
Forum Newbie
Posts: 20

Loc: Norman, Ok
Reg: 06-15-12
07-08-12 05:13 PM - Post#2245832    
    In response to Allan In NE

Ok thanks. I'm not too great with transmissions. Can you give me a clue as to where the governor is? I'm assuming it'll be an internal item.
1966 Biscayne 2 door


 
Allan In NE 
Frequent Contributor
Posts: 1555

Reg: 12-27-11
07-08-12 06:00 PM - Post#2245850    
    In response to cware

Under the round cover near the back of the transmission, driver's side. Pop that cover off and yank out the governor.

See if the gear teeth are apple-cored.

Governor pressure works hand in hand with throttle pressure, but if ya can't even get a 2nd gear shift, I'd sure think governor.

Allan
Lifelong GM automatic transmission specialist


 
txturbo 
Valued Contributor
Posts: 3279
txturbo
Loc: Rosenberg,TX USA
Reg: 07-27-01
07-09-12 07:50 PM - Post#2246374    
    In response to cware

Did you check the fluid level?
1969 Camaro SS 396/T400
1966 Impala 283/PG/AC
1966 Impala SS 427/4 Speed
1948 Panel 1 Ton
1963 Cadillac
1940 Ford P/U
1954 Chevy 3100
1955 Chevy 3100 2nd series
1956 Cadillac Coupe de Ville PINK
1930 Model A hot rod


 
cware 
Forum Newbie
Posts: 20

Loc: Norman, Ok
Reg: 06-15-12
07-09-12 08:36 PM - Post#2246393    
    In response to txturbo

Yeah I did. Was hoping it'd be something that simple but the fluid level was fine. I'm going to try the governor wednesday and see if that solves the problem.
1966 Biscayne 2 door


 
nicke 
Contributor
Posts: 867
nicke
Age: 31
Loc: Spokane, Washington
Reg: 01-06-12
07-09-12 10:41 PM - Post#2246426    
    In response to cware

I know you said you did, but I would double and triple check the TV linkage again. Check by the carb as well as where it goes into the tranny.

-Nick
My 65' Impala SS LS Swap

6.2L LS ,4L80E, 3.73 gears, disc brakes


 
D.Mac 
Senior Member
Posts: 997

Loc: Ontario Canada
Reg: 03-22-03
07-10-12 05:15 AM - Post#2246467    
    In response to nicke

Stuck throttle valve?

Dave MacDonald
Ontario, Canada

'66 Impala LT1/C950-,EFI,700R4,(sold 07/2011)
'12 Sonic LTZ, Turbo, M6
'07 Pontiac Solstice GXP
'06 Caddy CTS-V


 
cware 
Forum Newbie
Posts: 20

Loc: Norman, Ok
Reg: 06-15-12
07-14-12 01:03 PM - Post#2248175    
    In response to D.Mac

Yeah I adjusted the tv cable and had a mechanic friend adjust it again to make sure it as correct. Had the governor installed but it didn't solve the issue. Still no shifting. The tranny fluid was burnt so I'm leaning more towards the tranny being broken and in need to be rebuilt.
1966 Biscayne 2 door


 
GottaSS 
Forum Newbie
Posts: 98

Reg: 07-16-12
07-16-12 07:34 AM - Post#2248692    
    In response to nicke

Here is a quote from the Holley tech manual for the 4150 and 4160 carbs:

GM APPLICATIONS
WARNING: If you are using this carburetor with a GM overdrive transmission TH700R4 or a TH200R4, you must use a transmission kickdown cable bracket (Holley® P/N 20-95) and stud (Holley® P/N 20-40). Otherwise, SEVERE transmission damage WILL result. This carburetor is not designed to work with ANY other automatic overdrive transmission.

Edited by GottaSS on 07-16-12 07:36 AM. Reason for edit: No reason given.

 
cware 
Forum Newbie
Posts: 20

Loc: Norman, Ok
Reg: 06-15-12
07-16-12 03:39 PM - Post#2248844    
    In response to GottaSS

My carb is an Edelbrock. Not sure if that makes a difference. I'm really not sure what type of bracket it has on it right now. I have a picture of it so I'll see if I can post it.
1966 Biscayne 2 door


 
nicke 
Contributor
Posts: 867
nicke
Age: 31
Loc: Spokane, Washington
Reg: 01-06-12
07-16-12 04:03 PM - Post#2248851    
    In response to cware

I would be interested to see the bracket. You can't really tell by looking at the bracket if it is "right" as the geometry needs to be correct, and the amount of sweep is different than what most people use (an old kickdown bracket).
My 65' Impala SS LS Swap

6.2L LS ,4L80E, 3.73 gears, disc brakes


 
gm_fan 
Forum Newbie
Posts: 87

Age: 57
Loc: Murray, Kentucky
Reg: 12-13-09
07-18-12 06:15 AM - Post#2249375    
    In response to nicke

You more than likely have an issue with the 2-4 band since you had 4 gear problems first..The servo is on the side that applies the band in both second and fourth gear..The trans takes off in first on the forward clutches, the band comes on for second gear, then adds the 3-4 clutches on with the forward clutches for third gear, and then finally the band comes back on again for fourth gear,,hope this helps,,Mark

 
cware 
Forum Newbie
Posts: 20

Loc: Norman, Ok
Reg: 06-15-12
07-20-12 10:13 AM - Post#2250253    
    In response to gm_fan

I will send pics of the bracket to anyone who can assist me with posting a pic of it.
1966 Biscayne 2 door


 
wagonsouth 
"2nd Year" Silver Supporting Member
Posts: 840
wagonsouth
Age: 53
Loc: south AL
Reg: 10-25-09
07-21-12 06:22 AM - Post#2250520    
    In response to cware

I'm currently using an Edelbrock on the wagon (with 700R4), I had a Holley with a universal adjustment bracket. When I switched to the Edelbrock with the 396, I thought I had to have a bracket that would be correct for the Edelbrock...uses the same bracket. I went round with Summit about getting the right bracket, every time I would order a bracket it was the same as what was already installed.

Have you changed the trans fluid and filter? If the fluid looks "burned", possibly the filter may be old/clogged?
Brian B.
1965 Bel Air wagon
cashmere gold over sunburst orange metallic
396, Comp Cams "small thumper"/700R4 w/2200 stall
2006 & 2012, 2013, 2014... Hot Rod power tour long hauler
2008 HHR "sunburst orange metallic"


 
cware 
Forum Newbie
Posts: 20

Loc: Norman, Ok
Reg: 06-15-12
07-24-12 04:13 PM - Post#2251762    
    In response to wagonsouth

No i haven't changed the fluid. I finally took the car to a trasnmision shop and was told almost immediately that the bracket for the TV/Detent cable was wrong. He said it needed to move the TV cable out so that it would be aligned with the linkage from the carberator. So now I'm trying to get the corrct bracket and linkage from the carberator to see if that will fix the problem. Which part number did you end up getting from summit that was actually the right one for your carb?
1966 Biscayne 2 door


 
gm_fan 
Forum Newbie
Posts: 87

Age: 57
Loc: Murray, Kentucky
Reg: 12-13-09
07-24-12 09:00 PM - Post#2251892    
    In response to cware

IF you are wanting to check to see if the tv cable is the problem ,simply unhook it from the carb and drive it. IF the problem is the cable it will shift too quickly when you unhook it, but it will shift as there will be no line rise at this point..dont drive it far as it will damage it .if the fluid smells burnt it will be the 3-4 clutches ,Mark

 
wagonsouth 
"2nd Year" Silver Supporting Member
Posts: 840
wagonsouth
Age: 53
Loc: south AL
Reg: 10-25-09
07-25-12 03:46 PM - Post#2252131    
    In response to cware

the part number Summit sent me is TCI 376705, supposed to be universal fit....which led me to keep the universal fit one I had in place from my Holley....(below is the link to the TCI part).

http://www.summitracing.com/parts/TCI-376705/
Brian B.
1965 Bel Air wagon
cashmere gold over sunburst orange metallic
396, Comp Cams "small thumper"/700R4 w/2200 stall
2006 & 2012, 2013, 2014... Hot Rod power tour long hauler
2008 HHR "sunburst orange metallic"


 
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