I've looked at the allison as well. Even the 4L80E, because i believe that bolts up to the duramax as well, though the allison i think is probably a better design than the GM tranny. I've probably got a tough decision between the NV4500, Allison 1000 and the AW4. Decisions... I've thought about the 700R4, TH350 and 400, but those are almost a dime a dozen. But the Allison and NV4500 seem to be at the top of my list right now. Especially the allison because there has to be some guy out there with a duramax on nitrous, propane and some serious boost pushing some serious HP and torque numbers who will be wanting a beefed up tranny... Cause we all know how efficient those ISUZU designed duramax motors are.

Dan

92 Rodeo, 3.1 TB crank, custom bumpstop spacers, DOR shackles, Flipped ball joints, D44 Rear, 4.56s and new magnaflow cat and dynomax ultraflow muffler Since been replaced by a 2 door Explorer on 31's shackles, cranked torsion bars and full exhaust