88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto

[yjheep]

Im new to the forum but I have been browsing it for years. I thought I would share my project and build.

Its an 88 chevy crew cab. It is a Wrangler Corporation conversion truck. It started life as a 2 wheel drive dually with a big block, auto trans. It’s in the process of a 4x4 single wheel conversion with a 2002 Cummins diesel and Allison automatic trans. I’m about half way into the build. Look for updates to get you up to speed on it in the next week or so.

It is being built to the hilt with 2002 Cummins 12v Diesel (yes I said 2002 12v) and Allison auto. Dana 60 front with 4.56’s and a Dana track lock, 14 bolt rear with 4.56’s and a Detroit. Divorced NP205 with 1410 yokes. 12 inches of lift and 38” tires.

[yjheep]

I wanted a 4x4 crew cab but could not find one that was not a pile of **** so after a couple of years I ran across this clean 2 wheel drive crew, and the project began. I stripped out all of the front suspension along with all of the big block and trans. i started selling parts and collecting the things I needed slowly since this is a budget build, as much as a custom truck can be. I found a frame and cut off all of the 4x4 front end parts to use. the truck did not sit level with the weight of the Cummins so I decided to build custom hangers and shackles. I used half inch plate to build the hangers and made them an
1" ¾ longer. and i made the shackles 1" 3/4 longer as well

[yjheep]

Tacked in place, still need to gusset to the face of the frame and finish welding it in.

.

[yjheep]

After I got my lift installed, I noticed a big problem I did not foresee. Im using 8” rear springs and a 4 inch shackle flip for my 12” in the rear. The 2 wheel drive spring hangers on the rear are shorter than the 4x4 version, this caused my shackle flip to roll the springs and axle forward to an undesirable angle and short me out of several inches of lift. I got the new hangers and will get them installed with update pic’s as soon as this cold weather breaks.
Bear with me, this is going to be a slow build as the truck is too large to fit in a garage with heat.

[madcow75]

I hear that about the trucks being toooo big I had to take my cab of my frame just to get my truck in the garage just so I could get the rolling chasis in my garage. I have to re-assemble it outside.

[yjheep]

Well, I have this thing that a realtor called an oversize 2 car garage, that after I got all my shop tools in it. And a beer fridge and deep freeze. I would be lucky to get a geo metro in lol
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[NITRO1977]

Looks good......I want that interior for mine....especially the rear seat.

[nekkidhillbilly]

what kind of allison are you using the 1000 or what

[yjheep]

Well the original plan was a 6 speed Allison 1000 but I'm still waiting for a stand alone controller. So I guess for now I'm sticking A 545 ( I know it's a crap trans with no lockup or overdrive) but at least I'll be able to drive it till a stand alone is available
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[Pullin81]

Originally Posted by yjheep

Well the original plan was a 6 speed Allison 1000 but I'm still waiting for a stand alone controller. So I guess for now I'm sticking A 545 ( I know it's a crap trans with no lockup or overdrive) but at least I'll be able to drive it till a stand alone is available
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i would have to ask my buddy... but he own a mechanic shop in town and they put an allison behind a 07 dodge i dont remember where the stand alone computer had come from... ill ask him and let you know...

[yjheep]

It was probably a 5 speed Allison 1000. A couple places make the 5 speed controllers
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[Pullin81]

Originally Posted by yjheep

It was probably a 5 speed Allison 1000. A couple places make the 5 speed controllers
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actually yes come to think of it....it was 5 speed

[gtdownonit]

I did 6 inches of lift by springs with the added leaf to the front for the cummins. I also did a 1 inch body lift for a bit more room under the cab for the tranny. With the 6 inches The 37s fit great. I also have 4.56 gears and they need to be closer to 3.72. Top speed is 83 MPH with an NV4500.

[yjheep]

Originally Posted by gtdownonit

I did 6 inches of lift by springs with the added leaf to the front for the cummins. I also did a 1 inch body lift for a bit more room under the cab for the tranny. With the 6 inches The 37s fit great. I also have 4.56 gears and they need to be closer to 3.72. Top speed is 83 MPH with an NV4500.

That's why I'm waiting for the six speed it has 0.61 in the second overdrive (sixthed gear). I Like alot of room in the fenders over the tires the 12" over 38"s is the look I'm after. I'm going to keep my 8" springs I think under the truck for now since it's looking like I'm going to need a 3" body lift to clear the big ass 545. I'll make that decision after I get the motor and trams mocked up. I would rather not use a body lift. I guess I'll find out when I get the trans in.
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[rocking chevy]

How do you have a 2002 12v? Just wondering, i thought they ended in 1998.

[yjheep]

Originally Posted by rocking chevy

How do you have a 2002 12v? Just wondering, i thought they ended in 1998.

It's a Cummins!!! Not a pos dodge ram!! Just because dodge quit using them in 98 did not stop countless other company's from using them in thousands of other applications. It's my understanding that you can still purchase a new 12v for off highway applications. Anyhow my motor was a factory replacement for a 95, 2 ton truck. the I'd tag on the motor and p7100 have the stamped production date of 2002. Also I might add that this motor was purchased new from cummins in 2007, and installed at that time by a cummins dealer. It now has 67k miles on it.

I knew it was only a matter of time before some one asked. Thanks for not trying to tell me I had a 24v vp44 motor like most people, lol
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[rocking chevy]

Originally Posted by yjheep

It's a Cummins!!! Not a pos dodge ram!! Just because dodge quit using them in 98 did not stop countless other company's from using them in thousands of other applications. It's my understanding that you can still purchase a new 12v for off highway applications. Anyhow my motor was a factory replacement for a 95, 2 ton truck. the I'd tag on the motor and p7100 have the stamped production date of 2002. Also I might add that this motor was purchased new from cummins in 2007, and installed at that time by a cummins dealer. It now has 67k miles on it.

I knew it was only a matter of time before some one asked. Thanks for not trying to tell me I had a 24v vp44 motor like most people, lol
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I wasn't saying your wrong, I just didn't know what it came out of because They quit putting them in pickups in 98. Now I know, Thanks.

[yjheep]

Originally Posted by rocking chevy

I wasn't saying your wrong, I just didn't know what it came out of because They quit putting them in pickups in 98. Now I know, Thanks.

I know you were not saying that
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[yjheep]

Shackle flip with 2 wheel drive spring hangers is a no go. Since im going to have to use the 4 speed Allison I have, for now. I’m going to remove the flip and install my new 4x4 hangers with 8” springs. I’m worried that I will have to use a 3 inch body lift to fit the trans without serious firewall and tunnel modifications. I dont want to do all that work to put a different trans in down the road. At that point ill just install my flip and 12 inch front springs and remove the body lift.

[nekkidhillbilly]

last time i checked there is no stand alone for 6 speed just the 5

[yjheep]

Originally Posted by nekkidhillbilly

last time i checked there is no stand alone for 6 speed just the 5

You are right, but I did talk to fleece performance and they told me they are confident they can make the 6speed work. That they just have not had a truck to try it on yet. I kicked around the idea but that would be a long costly trip to trailer the truck out there. And I'm not a fan of Being the gueni pig when if I have problems with it I'm hours and hours away from them. they are just reprograming factory Allison controllers to work with a tps I think. And I would like the programable shift points like the 5 speed aftermarket controllers have. So I'll just wait around for what I want.
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[nekkidhillbilly]

you could use a 4l80e or the dodge overdrive too.

[yjheep]

4l80E and cummins is a bad idea and I could use a 47rh but I need the double od of the Allison to work my 4.56s at highway speeds
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[Dieselwrencher]

Great project! You can use a GM computer and wiring harness to use the Allison 6 speed. There's a guy in Mexico Mo that is doing one right now in a 78 Ford with a Perkins diesel. Dale is a great guy and will help you out with info if you'd want. I can get you his phone number.

[yjheep]

Originally Posted by Dieselwrencher

Great project! You can use a GM computer and wiring harness to use the Allison 6 speed. There's a guy in Mexico Mo that is doing one right now in a 78 Ford with a Perkins diesel. Dale is a great guy and will help you out with info if you'd want. I can get you his phone number.

I would love that. Mexico mo is only about 3 hours away
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