How To: Allison 1000 Swap Using OE Parts

swamp_ratt

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Please make this a sticky!

Here is what to do! You will need to find a t444e that had an auto trans behind it. You will need to grab the flywheel housing, starter, SAE2 to SAE1 adapter ring, flexplate, hub spacer, torque conveter plate and lock ring. Of course all bolts with such pieces will need to be retained. You can buy all of this on ebay for around 600 or less total, but going to your local junkyard is much cheeper. I picked all this up for 40 bucks! Install all onto your motor after removing the original psd aluminum trans spacer.

However i have not yet been able to confirm if the allison 1000 torque converter will bolt to the plate in this setup. If not it would be easy enough to make a new one. Will know possibly this weekend! This setup however does utilize an allison at545 so i cant see it being much different if at all.

On your allison 1000 series transmission remove and sell the OE gm bellhousing and go buy an OE allison 2000 SAE bellhousing. A new one can be had off ebay for about 100 bucks! Bolt the SAE allison 2000 bellhousing to your allison 1000! They use the exact same case so no modifications needed! Bolt up to your motor and go!

For 4x4 applications either figure out how to wire in an electronic transfer case gear selector, try to find a manual shift transfer case that bolts to the allison, or go divorced. I myself am going divorced np205.

The wiring is a little bit different story. PPE makes a stand-alone harness but does NOT advertise it. Tune you tcm with efi live or leave in stock form!

Here are the pics of the required pieces needed from the t444e! Yes it has to be a t444e and not an idi model! I do not have a picture on hand of an allison 2000 SAE bellhousing but you get the idea! Enjoy!

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weareweird69

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I dont know if that thing would fit between the frame rails, and its freaking heavy, I have one sitting here, its going to scrap unless someone wants it.
 

swamp_ratt

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Inside of frame rails is 34.5 inches at back of motor. Flywheel housing with engine mounts on is 30 inches. Nice way to have more mounts holding the motor. Work great for dropping trannies. Wont need to support back of motor. And yes... freakin heavy!
 

swamp_ratt

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For those of you doing this in your pickup please understand you will either need a body lift, or, if you are like me and hate body lifts, will need to do floor pan/firewall modifications to get this set up to fit. You could always use a t444e block and use the front motor mount on those, remove engine cross member and set the motor and trans lower in your frame
 

Hotrodtractor

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Why are you going to all the trouble to swap in an Allison 1000 transmission - just to put a divorced NP205 Tcase behind it? Going to a NP261/263 out of a Chevy would be a cakewalk and be stronger - and even better yet going to an NP271/273 out of a Ford or a Dodge is not that much more difficult considering it just takes the correct input shaft (the one from a manual trans Dodge if IIRC...), adding a speed sensor to the output of the trans/input of the tcase, and elongating one mounting hole.

I do agree the Allison is a much better trans for daily driving, towing, and even sled pulling than the E4OD/4R100 - now I better put my flame suit on and be prepared to justify myself with two words: Gear ratios.
 

swamp_ratt

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Is a np261/263 manual shift? The only reason i was thinking np205 was because id rather not play with wiring up the shift selector for the electronics. Not that i cant, just really dont feel like it as well as dont feel like finding a place to put the shift selector
 

Hotrodtractor

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Is a np261/263 manual shift? The only reason i was thinking np205 was because id rather not play with wiring up the shift selector for the electronics. Not that i cant, just really dont feel like it as well as dont feel like finding a place to put the shift selector

The NP261 is the manual shift tcase that comes in the Chevy's with the Allison transmission. The NP263 is electronic shift. The NP271 is the manual tcase that comes in the Fords (Superduties) and Dodges (Not sure exactly when they started until present...). The NP273 is the electronic version.

The NP261 is literally a complete bolt on ordeal because that is what was attached to the Allison from the factory in its 4x4 configuration. Swapping a 2wd to a 4wd is a rear case and output on the Allison.
 

swamp_ratt

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Ok. I never knew a manual t-case came behind the ally. Yeah i know whats different between the 2 and 4 wheel applications on the ally. Thanks for the info though
 

swamp_ratt

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Note, this same idea will work for the cummins as long as you have all the oe parts used to put the at545 behind the cummins
 

swamp_ratt

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To have an allison behind your 7.3 using oe parts rather than the 1500 dollar parts from destroked. That and some people want the allison. It gets a bad rep from from crappy tuners like edge or bully dog, but in truth properly tuned will hold quite large numbers. I had mine last 80k miles of straight abuse stock behind an lbz that put 1409 tq and 837 hp to the ground. This abuse consisted of drag racing, sled pulling, burnouts and harsh towing. When i got rid a the truck the trans shifted like new. The torque converter was a different story though. Who can complain about that kind of tolerance?
 

slowngreen

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Oh right on. I guess if an allison can handle 100hp over stock (duramax), then thats pretty big hp numbers to get the 7.3 up to without worry...Isnt it?
 

lincolnlocker

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Why are you going to all the trouble to swap in an Allison 1000 transmission - just to put a divorced NP205 Tcase behind it? Going to a NP261/263 out of a Chevy would be a cakewalk and be stronger - and even better yet going to an NP271/273 out of a Ford or a Dodge is not that much more difficult considering it just takes the correct input shaft (the one from a manual trans Dodge if IIRC...), adding a speed sensor to the output of the trans/input of the tcase, and elongating one mounting hole.

I do agree the Allison is a much better trans for daily driving, towing, and even sled pulling than the E4OD/4R100 - now I better put my flame suit on and be prepared to justify myself with two words: Gear ratios.

6sp rite?
 

swamp_ratt

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Alright guys, a little update. I went to my local Allison dealer and bought this bell housing as I am going to run a gm duramax allIso. Behind my dt360 using the original dt flywheel housing. The part number for the bell housing is 001AT29547463 and I recommend a new gasket part number 001AT29536478. I'll post a few pics when its in the truck!
 

swamp_ratt

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Oh yeah, price on the bell housing is 236 dollars and the gasket is 12 bucks. Beats buying the custom adapters from destroked!!
 

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