Valv

My '99 transmission is broken (snapped bellhousing on a wreck), I am in the decision of getting another rebuilt or an option to install an Allison 1000 (same as Duramax) from a wrecked truck that had a Cummins ISB motor.
I am sure the bellhousing adapter will work, my question and debate is if possible to run the Allison in standalone mode, and reprogram my ECM to "forget" the old automatic transmission.
I was reading somewhere that there is an option for the tranny to have it's own computer.

Will transfer case installation be a problem ?

The thought of having a 1000 Allison on my truck is making me very interested in this whole deal, what do you guys think ?

BigBlue

Please do this and tell me how it went. I would kill for a DTT upgraded Allison.

juicedcummins

That 5.9 will shred a stock wannabe Allison in short order. An Allison upgraded by DTT has a good chance of survival.
Have DTT build you a proper 47re and you will be $ ahead with as good or better trans.

mkubacak

I believe if I remember correctly, that GM has the derate the power some in certain gears just to get the Allison to live behind a Duramax. I can't imagine what a properly tweaked Cummins would do to one.

Valv

Ok, after further study I found out the transmission is a 2000 not a 1000, I will go tomorrow to inspect truck and know exactly what we are talking about.
Also is a 2wd tranny adaptable to 4wd (just remove tail end) ?

If I will buy this and follow through this upgrade I will keep everybody updated.

I heard from my rebuilder too that the 47RE is not a bad transmission, especially if beefed up.

BigBlue

Yall are probably right about the strength of a DTT built 47, but I would kill for that extra gear. I wonder how a 5 spd auto cummins would do in the 1/4.

CTD NUT

When the 47RE is built by the right builder and does so with the correct parts to handle the enormous torque a properly bombed CTD will create, then yes, a 47RE will work very well.......this is not cheap, though.

If you have a 2WD tranny the output shaft will need to be changed to work in a 4WD application.....This can be done with factory GM parts on an Allison 1000 but there is a possibilty that the t-case input shaft may need to be changed also as I am not aware if the GM and DC NP241's share the same input shafts.

xcavater

The Allison trans has it's own ECU. You'll have to modify a wiring harness to use it.

j-fox

Does the Allison 2000 have an OD gear?
I was told by Allison Corp, that the 1000 was the only OD trans they make??

Mike D

http://www.turbodieselregistry.com/f...d.php?t=120126

It's not the 2000 Alli, but it's interesting reading.

Steven B.

If you are sure that this transmission is an Allison 2000 Series don't bother.

The 2000 Series Allison has no parking pawl - something that you will want/need.

A better choice would be the 1000 Series, which does have a parking pawl.
FedEx used the ISB/1000 Series combination for a while in their package cars.
Look carefully if you plan to try and get one from a wrecked FedEx vehicle. The
early package cars used the 6B/AT542NFE (Allison) transmission. The AT does not
have a parking pawl, lockup converter or overdrive, so it's not a great candidate.
Think of the AT as a GM Turbo 400 on steroids, with an extra gear "in the middle"
of the range.

Allison did install 1000 Series transmissions in a pair of pickup trucks for Dodge, in
an effort to "sell" the transmission to Dodge. This was done by Allison employees in
Indianapolis. They tell me that the only real physical obstacle was that the body of the truck
had to be lifted almost two inches.

Oh yeah, since someone will probably ask, a parking pawl is a mechanical device inside
the transmission that holds your vehicle still while in "park". "Park" is nothing more than a second neutral without the parking pawl. On commercial vehicles using the 2000 Series transmissions, a parking pawl is not needed, as most of these trucks are air brake equipped.

Allison does make the 2400 Series transmission, which is similar to the 2000 Series as far
as power ratings go, but the 2400 does have a parking pawl.

Also, 1000, 2000, and 2400 Series transmissions typically come with SAE# 3 converter housings. Again, be careful. The SAE# 2 housing is an option, and this housing will not fit
the flywheel housing of a Cummins as installed in a Dodge.

Finally, sometime or somewhere in the future, your potential Allison might need an overhaul.
The cost for this will make a DTT, Suncoast, (pick your favorite brand) modified tranmission look like small change.

How do I know all of this? I used to work for the Allison Dealer in Memphis who took care of FedEx with regard to their Allison warranty program. The Sales/Application of the Allison product line was my "specialty".

Good luck. I'm not trying to "rain on your parade". Just don't want you to waste your time and money.

Steven