View Full Version : Allison ????????
10-19-2007, 01:42 PM
Has anybody ever heard of an Allison transmission behind a Cummins? (in 1st, 2nd, or 3rd gens?) Does anybody make an a-dapter kit? What is the current consensus on the Allison? If money were no object would anybody choose it?
10-19-2007, 02:44 PM
they have an allison made for the cummins block i think, but someone on here, stated earlier that someone told him that id be cheaper to build a 47rh amd still have a better tranny
10-19-2007, 03:02 PM
^ Ditto. Another thing is they still haven't made a decent stand alone controller for it. It either needs to be a old one or you need the Dma'x harness and ECU. Also, they are huge trannys.
10-19-2007, 04:03 PM
Many times school buses had an Allie behind a first gen. I don't know the model. I had thoght about doing a 1000 conversion on my auto but it looks real expensive.They do handle the torque and shift firm.Ther was just a bus on ebay in the cummins engine search with this setup.
10-19-2007, 04:11 PM
I think a hillkiller 1000 + an atlas would be awsome! like the one on Extreme 4x4 on the SUBURBAN GORILLA! behind the Banks twin turbo D-max! [guitar]
Does anybody make a kit or is it so rare it would have to be custom?
10-19-2007, 05:19 PM
Also the Allison behind a DMax (which is what I am thinking you are referring to) like to defuel the engine before it shifts. That is another downfall
10-19-2007, 05:25 PM
1stgen545 has a medium duty Allison in his truck.
10-19-2007, 08:49 PM
My work truck has an Allison in it behind a CR motor. I tore it out at 9k mi. the first time & again at 80k.
10-19-2007, 10:01 PM
I'm too looking for the right combination to put behind the cummins. First I wanted to use the zf-5, I really like this tranny no problems/leaks or anything to worry about it will shift like butter in every gear towing or empty but it was too much $$$$ to adapt it to the cummins and many say it won't hold for long behind it. I thought the getrag could be a good option but it has many issues I don't think I like but it sure is cheaper to start.
Is there other real world options? The engine on this truck should last a long time so that gives Me time to pick the right tranny for My cummins but in case someone knows I'm not only interested in power (we all are) but in mpg and engine longevity. What else is out there?
10-20-2007, 12:16 AM
A fully built 47rh from BD Power is what I did and after having it you dont really need any other option. I figure I am around 350hp/750ftlbs and I can do full power take offs(ease into it a little but quickly to full throttle) and the trans shifts firm and fast while pulling my 28' enclosed trailer(4500lbs) with my chev lorider truck(4500lbs) in it. This trans is awsome but its a full build. Torque converter, valve body, internals, and presure loc kit(raises trans pressure). Probably my best mod so far. Much more performance then the gut-bag 5spd and I think I picked up 1-2 mpg.
10-20-2007, 12:20 PM
It was bolted to an 5.9 liter Cummins with a VP44 injection pump in a 2003 Freightliner. The truck was wrecked with 17k miles on it and I bought the drivetrain. This Allison was set up as six speed with double overdrive.
I thought about trying the allison in my first gen. Suncoast has a controller they are working on, but it isn't done yet. Just the controller was going to run $3K-$4k+ the cost of a built tranny(another $7k.) I had a 47rh built instead to replace my NV5600. I should have it back in another week or so. The gearing looks a little odd with the high 1st gear, but I don't hear many complaining unless towing heavy. The only weak link seems to be that there wasn't a billet output shaft available. I bought one of the new rh billet outputs from Suncoast in case I have problems with the stocker(probably won't need it). I don't see many complaining about breaking the output shafts. Still an expensive conversion, but will make it nice to take an occasional trip to the races and suprise an occasional city cowboy in his King Ranch Powerstroke.
10-20-2007, 02:20 PM
an allison is a great idea its better if u get the 6 speed one then tie it together with nice gears and then u will have sweeeet fuel econ
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