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Just a side note: the Frito Lay trucks with the autos came with the TH475 which is a heavier duty version of the TH400. there is also a webcast auction on Dovebid in Pomona CA coming up on Feb 7th that has a lot of 4bt trucks.

4bt swap I would also recommend the 4bt, it weighs less, shorter also. Unless you plan on towing very big loads, the 4bt should do fine. You can turn up the fuel and make other adjustments to get the power and torque you need. Here is a website that might help you...