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

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.

http://i881.photobucket.com/albums/a...v/8d154ef9.jpg

http://i881.photobucket.com/albums/a...1328830437.jpg

http://i881.photobucket.com/albums/a...1328830403.jpg

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

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

http://i881.photobucket.com/albums/a...1328830080.jpg

http://i881.photobucket.com/albums/a...1328830171.jpg

http://i881.photobucket.com/albums/a...1328829997.jpg

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

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

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

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

http://i881.photobucket.com/albums/a...1329003323.jpg.

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

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.

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

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.

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

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

what kind of allison are you using the 1000 or what

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

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

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.

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

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...

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

It was probably a 5 speed Allison 1000. A couple places make the 5 speed controllers
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

actually yes come to think of it....it was 5 speed

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

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

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

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

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

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.

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

I know you were not saying that
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

http://i881.photobucket.com/albums/a...1329150382.jpg

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.

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

Awesome project. You have good taste in trucks, engines, and transmissions! I would definitely hold out for the 6spd allison. The .61 OD is awesome if you like to tote the mail on the highway. My 06 DMAX / 6spd Allison / 3.73s / 33s will run 1800rpm at 80mph! I think 2100rmp is 90mph. Good luck with the build!

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

Thanks, been building this truck for years in my head and on paper just finally get to put it together. I did the calculation on 4.56 and 37" tires with the .61 ood and it works out great for the Cummins power band and fuel milage.
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

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

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

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

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

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

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

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.

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

I would love that. Mexico mo is only about 3 hours away
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

Mexico is only about 20 minutes from me if you get up that way. I like to shift gears but need another OD in my 84 with Cummins/NV4500/4:56 gears

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

Me too, I like to lug em and roll coal too but, you do need that second OD with 456's looked into the gear vendors but there over priced and would be a week link in my drivetrain
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

Nice build!

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

A built 80e will hold a pretty mean cummins actually not really enough overdrive though. You can do the suncoast 6 speed conversion to the 5 speed. It ain't cheap. What about a newer dodge trans I've not fooled with one but there 6 speed and hand in hand in strength as the Allison. Since I'm a dmax owner I'm not as keen on dodges.
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

80e or the 47 with a gear vendors is another option cost is about same as Allison with stand alone though.
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

As for using tcm from the gm truck idk how it would work without pcm from a gm and bcm to. It requires input from the pcm to work and the bcm to control like tow haul and all.
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

A built 4l80e will hold a stock Cummins, not even a mild built Cummins. We got about 4 months out of a full race monster 4l80e and as I have stated many times I need the double over drive.
As for the sun coast 6 speed kit, it still requires the six speed controller, your better of just starting with a newer 6 speed its cheaper.
The new 6 speed dodge is too new for me to mess with because of lack aftermarket support at this time, also it requires a standalone
Also I discussed the Gear vendors unit a couple of posts ago, it is overpriced and a weak link in my drivetrain. I am running large diameter and thick wall tubing with 1410 yokes all around since my goal is to break the 1,500 foot pounds of torque mark.

Fleece as well as the guy in mexico Mo. I would assume is removing that part of the programing from the TCM, and it is only getting its incoming information from the speedo and TPS.

Please read ALL of my posts and do not overlap topics I have already covered, I would like to keep my build thread exactly that, and not a discussion forum. Thanks.

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

I was going to add some info about the GV unit, but you already have your mind made about them............. Carry on. Good luck keeping that 545 in there with much power. I've seen 353 non turbo detroits kill them with ease. PM me for Dale's number when you're ready.

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

It won't last, I do know that. it's going to stay at the 190hp stock till the 6 speed is doable. Also know my top speed is going to be around 60mph with the pos 545.
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

Sorry just trying to help
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Re: 88 crew cab 4x4 single wheel conversion with 02 Cummins/allison auto
 

http://i881.photobucket.com/albums/a...1332514313.jpg

got my tires and wheels in today.

http://i881.photobucket.com/albums/a...1332514226.jpg

I’m happy with the lift and tires size, looks just about right. after i get the Cummins and Allison it its going to settle a couple inches or so, but i still need to install a 2 inch body lift to clear my sae bell housing so it should sit about where it is now.

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

Please tell me you're keeping the air horns, visor, cab lights, and if there is a god the awesome striped paint!! :)

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

I wish I was keeping the paint! I had to get a different bed to go single wheel. So that's too much custom work and they said with no paint codes there is no way they could match the 4 colors of brown in the sripes. It's going to be hugger orange with white down the center. But everything else is staying
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