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Username Post: 1990 k1500 build.        (Topic#358711)
Capt. Tim 
Gold Supporting Member
Posts: 22
Capt. Tim
Loc: ID
Reg: 11-04-19
11-04-19 08:50 PM - Post#2779565    


https://drive.google.com/open?id=1uu_40BrRBjHN QklU...
OK here it goes. If this is not the spot to do this please let me know. I joined to document the rebuild of my 90 model k1500. As you will see there are going to be some big changes to this rig.
I had "X" dollars to put into a truck and found that I could afford a 2014 or 15 truck with 150000 miles on it and all of the problems that come with that. OR...I could put the same money into my current truck and end up with a unique truck that I know what all of the little quirks are and how to address them.
I have chosen the latter and hope to get tons of input and support throughout this build.

First a little history. I bought this truck a couple years ago and it came as you see it in the pic. 4 inch Pro Comp lift and 35-12.50-15 tires were about the only changes from stock. Someone had also switched from the automatic to a 5 speed tranny. 350 ci with .373 gears.

So far I have upgraded to Pitbull 37-12.50-15 Rocker tires, Added https://www.hannemannfiberglass.com/ fenders, hood and bed panels, Spicer gears front and rear. Went to a .456 gear ratio, New 4340 steel axles , Detroit locker in rearend.Can't remember the brand or actual name of device but Drivetrain shop recommended device to help speed up the 4wd engagement. Anyway added that to the hub engagement solenoid, added 2 inches to the lift and put on an Ali Ark Bumper.
So as of today that is as far as It has gone. What is to come? Here is the list of what should happen and the order it is planned.

undercoating
500 ci motor (1968 Caddy donor) (more info to come on motor)
4L80E SS Tranny from Monster Transmissions
NT 205 Transfer Case
driveshafts to match changes
Paint and body work
Electrical and Interior
Exterior rollcage

Well there you have it. The project has begun and I look forward to chatting about it and keeping myself accountable by posting here.
Im sure there are items missing but I will update this post via replies as I go along over the next 3-4 months.

Latest pics...
https://drive.google.com/open?id=1TZkhgJT9d5QA PQQu...

https://drive.google.com/open?id=1ArxlmVoEoWUz OsSU...

https://drive.google.com/open?id=1SpcEbzlA4-bn Kx36...

1990 K1500 Project TNKA TRK

Nampa Idaho


Edited by Capt Tim on 11-04-19 09:13 PM. Reason for edit: No reason given.

 
CowboyTrukr 
"8th Year" Silver Supporting Member
Posts: 4298
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
11-05-19 07:08 AM - Post#2779586    
    In response to Capt. Tim

Gonna be a fun truck when it’s done.

Keep the pics coming!

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
scrambldcj8 
Silver Supporting Member
Posts: 2517
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
11-05-19 05:26 PM - Post#2779634    
    In response to Capt. Tim

Not sure how that 8.25" IFS will like you.....Same with the locked up 10bolt rear. You're on borrowed time on both. Fairly heavy tire/wheel combo.

I love the idea of the 500 Caddy.....Tq!! Are you going to mod a 454 TBI for it?

The lower portion of your front bumper kills your approach angle....I'd hack that off.

Rethink the NP205, bulletproof yes, but it's only 1.96:1 low range. Consider a doubler instead.....NWF or Off Road Design has great doubler kits (NP203 low range mated to the NP205).

Oh, and you may plan for a D60 front axle swap too

http://offroaddesign.com/catalog/doubler.htm

http://www.northwestfab.com/NWF-BlackBox-Underdri v...

Not sure how mild or wild you wanna get with the truck, but with the option of the easy to find GM/Dodge D60. You could run a pass. drop NP205 (again crappy 1.96 low range) or find a pass. drop ('90-91 Blazer/Suburban IIRC) NP241 (2.72 low) as it will have the electric speed sensor....if that is even a concern for your' setup when you get to that point...?



 
Capt. Tim 
Gold Supporting Member
Posts: 22
Capt. Tim
Loc: ID
Reg: 11-04-19
11-06-19 07:38 PM - Post#2779701    
    In response to CowboyTrukr

Thanks and yes, I think it will be pretty fun ride.

1990 K1500 Project TNKA TRK

Nampa Idaho


 
Capt. Tim 
Gold Supporting Member
Posts: 22
Capt. Tim
Loc: ID
Reg: 11-04-19
11-06-19 07:42 PM - Post#2779702    
    In response to scrambldcj8

Not sure how that 8.25" IFS will like you.....
What should I watch for?

Are you going to mod a 454 TBI for it?
No, going with a Performer intake and have not decided on a carb yet...

The lower portion of your front bumper kills your approach angle....I'd hack that off.
lol yep. Hide and watch.

D60 front axle swap
lol Yeah I know...

Thanks for the input. Keep it coming

1990 K1500 Project TNKA TRK

Nampa Idaho


 
scrambldcj8 
Silver Supporting Member
Posts: 2517
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
11-10-19 01:14 PM - Post#2779914    
    In response to Capt. Tim

  • Capt. Tim Said:
Not sure how that 8.25" IFS will like you.....
What should I watch for?





Shrapnel....LOL, you'll be eating steering components and once you apply the 500lb/ft Tq from the caddy motor and the strain of pushing 37's it wouldn't surprise me if the case goes. All depends on how much abuse you give I suppose.



 
Capt. Tim 
Gold Supporting Member
Posts: 22
Capt. Tim
Loc: ID
Reg: 11-04-19
11-18-19 06:05 PM - Post#2780460    
    In response to scrambldcj8

So, stage 1 is done. Tires, regearing, axles around, undercoat, fenders and bed skins, and lift (Didn't want to but went to the 6" Fabtec).

Next phase is in prep. Engine swap to 472 ci Caddy, exhaust, Tranny 4l80e ss from Monster, and np205 tc, driveshafts and dash (to accommodate gauges and lcd screen from the trans. shift module). Will also do the wiring harness and paint engine compartment.
Goal is to have everything ready by Friday and finish stage 2 in 2 weeks.

1990 K1500 Project TNKA TRK

Nampa Idaho


 
Capt. Tim 
Gold Supporting Member
Posts: 22
Capt. Tim
Loc: ID
Reg: 11-04-19
11-18-19 06:06 PM - Post#2780461    
    In response to Capt. Tim

So, stage 1 is done. Tires, regearing, axles around, undercoat, fenders and bed skins, and lift (Didn't want to but went to the 6" Fabtec).

Next phase is in prep. Engine swap to 472 ci Caddy, exhaust, Tranny 4l80e ss from Monster, and np205 tc, driveshafts and dash (to accommodate gauges and lcd screen from the trans. shift module). Will also do the wiring harness and paint engine compartment.
Goal is to have everything ready by Friday and finish stage 2 in 2 weeks.

1990 K1500 Project TNKA TRK

Nampa Idaho


 
scrambldcj8 
Silver Supporting Member
Posts: 2517
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
11-19-19 04:23 AM - Post#2780481    
    In response to Capt. Tim

  • Capt. Tim Said:
Engine swap to 472 ci Caddy, .




Darn, what happened to the 500cid Caddy? That would've been a beast.

What "axles around" were changed to...?

What gears did you swap to? Above you already had 4.56. I'd hope for 4.88 at a minimum but 5.13 would be perfect (you have OD and that crappy low range ratio with the 205, and a higher 1st gear (2.48) in the trans vs. the 5spd). Do you happen to know what 5spd was swapped in when you got it?



 
1983G20Van 
Super Senior Member
Posts: 3794

Loc: Bedford, Texas, USA
Reg: 11-13-02
11-19-19 07:57 AM - Post#2780503    
    In response to scrambldcj8

  • scrambldcj8 Said:
  • Capt. Tim Said:
Engine swap to 472 ci Caddy, .




Darn, what happened to the 500cid Caddy? That would've been a beast.

What "axles around" were changed to...?

What gears did you swap to? Above you already had 4.56. I'd hope for 4.88 at a minimum but 5.13 would be perfect (you have OD and that crappy low range ratio with the 205, and a higher 1st gear (2.48) in the trans vs. the 5spd). Do you happen to know what 5spd was swapped in when you got it?



He said in his first post it was a 68 Cadillac. The 500 did not come out until 1970 in the Eldarado only. Prior to 1971 everything else had a 472. Not like the 472 isn't a torquey engine itself.

Also FWIW those Cadillac engines do not need or want to turn RPM. They came with 2.53 gears and the TH400. 4.56 and 37s would still be plenty of gear.

My cammed 8.1 Tahoe has 3.42 gears and 32" tall tires with the 4L80E. With the mercruiser marine HO cam that is in it the thing still has more than 400 ft/lbs @ 1,200 rpm. I have the 4L80E programmed to hold 4th gear and lockup down to 1,000 rpm. Even at 800 rpm the marine spec 8.1 has more torque than the 350 Vortec made at peak torque.


1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 11-19-19 08:04 AM. Reason for edit: No reason given.

 
scrambldcj8 
Silver Supporting Member
Posts: 2517
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
11-19-19 12:04 PM - Post#2780522    
    In response to 1983G20Van

On-road vs. Off-road = Apples an Oranges

He intends to DD, hunt, camp, and heavy off-road this truck <<< heavy off-road is subjective.

22:1 1st gear low range is pretty weak (high)... (that's before tire height compensation). Just about everything he encounters off-road will be in low range...he essentially won't have a low range in reserve. Gearing is used to slow the vehicle and keep the vehicle in control.

Off-road it is not all about power/Tq it is about proper gearing...and choice of gearing to use in certain situations. Does a Unimog have a 400lb/ft motor? No, but it does have 20ish forward gears to choose from. Hell, a Humvee runs a 2.73 diff, 2.48 trans, 2.72 Tcase, and 1.92 geared hubs (final axle end ratio 5.24:1) and 37's comes in at 35:1 crawl ratio....not stellar for a 7000lb rig.

That 8.25 won't like hitting things at speed for long.....Keep in mind tire weight alone is 88lbs per tire.

He has O.D....why not take advantage of it with gearing.....Or as mentioned earlier, use a doubler.

Regarding the Caddy 500...you're right....I skipped right over the year.

PS: Besides these trucks just look so good on 40's....OP it won't be long …

PPS: Truck in pics compliments of pirate4x4 (DMANSbluesfreak) and showcased in 4W&OR. Yes runs 40's w/4.56 (states he will be swapping to 5.13) and a 5.3/4L80 BUT runs a NWF EcoBox (2.72 reduction) mated to an NP205 (1.96 reduction for a combined 5.33:1 Lo-range)….60:1 ratio. OP, your 22:1 will get old fast.

Attachment: IMG_20190926_171924928_HDR.jpg (266.68 KB) 6 View(s)






 
Capt. Tim 
Gold Supporting Member
Posts: 22
Capt. Tim
Loc: ID
Reg: 11-04-19
11-24-19 06:10 PM - Post#2780895    
    In response to scrambldcj8

Just adding to the list for stage one with the gears. Staying with the 456. went with the 4340 moly in the rear for axles. TRQ on the front. cant remember the 5 spd model. wil grab it during the swap this week though.

1990 K1500 Project TNKA TRK

Nampa Idaho


 
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