As for 700R4's not holding up I have a friend that has one behind a 585hp 383 with 4.09 gears in the rear. The motor had like 10 pulls on the dyno after being built and that is the average at the flywheel, the trans is having no probs. A recent 700R4 install was done on an old Chevelle along with a 550hp BB by him also, doing quite well. Another thing to note is that this auto is pretty much the trans of choice by rockcrawlers because of the low first gear. These rigs have low gear ratios, big tires and lots of hp. The rigs are almost always moving slowly in the lower gears at high RPM's generating much higher operating temps and stresses than normal driving will ever do. Never hear of trannys breaking it is usually other drivetrain parts like the axle. The 700R4 is a good trans if built and installed correctly, it will live as long as any other if properly maintained. Hope this eases some concerns.
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Richard
1972 K10 Custom Deluxe SWB Fleetside
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