While you may or may not disagree, the money, time and effort required to put an allison behind a Cummins IS ultimately far more than building up the current tranny that is there, in terms of an automatic.
For example, it would cost me thousands to drop my 47re for even an Allison 1000. I would need the transmission, adapter plate, flex plate, converter, harness, custom shafts, just to start . I would be left with less torque capacity. Why? because a mildly modified 47re holds more torque than a stock Allison 1000.
Now if your starting from scratch, then maybe the Allison might be the way to go. But again, you'll be spending thousands of dollars more to get that transmission to do what a beefed up 47re will do.
My personal example is this: My modified cummins 12 valve puts out about 250hp@2500 rpms and 525ft-lbs@ 1600rpms. To get my stock 47re built to the level to hold more power than that was about $1200, work done myself. (Performance/towing valve body, a few beefy internals, and a Billet low stall converter)
One of the biggest misconceptions around is that a stock Allison is built for anything more than stock power.
There is a reason why there is a conversion kit to put a 47re/48re behind a Duramax. The Dodge trannys are the easiest and cheapest to build, by far.
This post was edited by PretendFarmer at 06:58:08 12/02/13 4 times.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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