Quote:
Originally Posted by minimonster17
the 4R100 is good up to 1000 ft lbs of torque, while the 4R70W is good up to abouut 700 ft lbs. your stock transfer case is the Borg Warner 4406. Swapping to the 4R100 is not an easy swap. You would also need a new computer, and torsion bars that are about 6'' longer so that they will clear the longer transmission. There are other many other little pitfalls as well. You would be best to beef up your existing transmission. The only 97-03 trucks that came stock w/ the 4R100 were the 7700 package (4WD version) and the Lightning (2WD version) no supercrews came equipped w/ the 4R100.
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My supercrew had a 4R100 in it from the factory, no question about it. As for your number of what they can take, I'd be hard pressed to find anyone who would agree with your torque ratings. A 4R100 in stock form would maybe handle 550. Just look at all the diesels that fry them with just a tuner. Add some hp to a lightning and you've toasted it. 550 is the max i'd say it could take. a 4R70W is much worse off then that. I'd say it could take 400 or a bit more. the 4R70W is a light duty car trans that for sapped in their 1/2 tons. It's not a great trans or even a good one for towing. I can tell you most people would agree so would ford since they went to a 4R75W in their 1/2 tons.