Ok, for some of you, it may sound simple. Just toss the TH350 and get a TH400. The problems are: <font color=blue> 1) I want to keep my NP203, so I'd need a $400 adapter for the TH400. 2) The only 4wd TH400 I've found in a junkyard is mated to a NP208 and the guy wants $500 for the combo with no warranty on the tranny's condition. 3) TH350 and TH400 are different lenghts, which would mean different driveshafts, more $$$ 4) I'm in Guatemala, Central America, so shipping something as heavy as a tranny is not an option. </font color=blue> Now someone mentioned that a STOCK TH400 is stronger than a STOCK TH350, but you can make the TH350 handle more power than a STOCK TH400 if you build it right. Is this true? What is the most torque and hp a TH350 can handle with all necessary mods? My 454 was mildly rebuild a few years ago, so maybe 350 ft/lbs of torque and 200hp is a down to earth figure, and I'm not planning on rebuilding this engine for about 2-3 years, but I need to think about the future and have a tranny that's ready for something like 500 ft/lbs of torque and 400 hp. Will my TH350 hold to this kind of power? Aren't drag racers using TH350s? I promise to change my ATF once every two oil changes. The guys at transmissioncenter.net rate their TH350 at 400hp max. They install a Transgo kit (about $70 form summit), replace a race which they sell for $29, and use a 700R4 low clutch instead of the TH350 one. A local tranny shop charges about $120 for labor. That's $219 vrs $650 of the TH400+NP208+New Driveshafts combo, or about $700 for a TH400 and an adapter for my NP203. I can blow my tranny 2-3 times and still have spare for towing. And still, there's a chance that the TH400 I find might still need $200 to rebuild. Am I crazy or does it make more sense to keep the TH350? Please feel free to post all of your opinions, good or bad, they are welcome. Thanks. PD Sorry for the long post.