If you have a good TH-350 it will handle your 325 HP no problem. My 327 was at least 325 when I had it installed behind my junkyard TH-350 and I drove the crap out of it for 4 years before putting the truck in storage. It's a great transmission. The TH-400 is awsome too, but if you don't have a lot of HP you don't need it. Get the 400 rebuilt and have it as a spare or sell it. The drag racers love them. Just my 2 cents
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