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I'm really looking forward to having this Allison 5 speed mated to the Cummins for the reasons Zaphod names. I installed a shift kit which meant dismantling almost the entire tranny, but I was able to reassemble it quite easily with a tranny book. It's a lot easier than I had ever imagined. If I needed to rebuild it, I now know I could do it myself. But I'd leave the older trannys and even the manuals to a professional rebuilder.
I think a torque shift behind a Cummins would be an outstanding option if the truck originally came with one, and I'm sure someone will do one sooner or later. Mine came with a 4R100, which I had BTS build, but I sold it because it has one less gear than the Allison. Also, if I change the valve body, I can bump my Allison up to a 6 speed (double overdrives).
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clam the powerstroke grinch
2000 Excursion LTD 4x4
Slightly tweaked HPCR 5.9 Cummins
Allison 1000 5 speed auto
Last edited by clamgulch; 07-05-2008 at 02:48 PM.
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