4 speed strength

rumblefish360 said

HP wise, these trannys give up or live a short life after a 550 HP mark and track use as a combo. The shock they recieve between the hi hp level and super grip of the track cause a big shock at launch and shorten the trannys life preety much down to months (If it's mint to begin with.)

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What all can you do to them to beef them up to handle the extra horsepower? I'm looking at dropping a 6.1 hemi in a 67 Dart that's got a 318 and 4 speed in it now. I expect a cam swap to start with and probably some boost down the road, but I'll deal with that when I get the money. I figure with the cam I'm looking at around 450 hp, and I do intend to weekend race the car, though I will be driving it on the street primarily. I probably won't be racing too terribly often, but I figure maybe a few times a month. I probably won't completely murder the car on launches, but I certainly won't be just rolling off the line (where's the fun in that =P). I'll probably drop some street slicks on it, maybe a backup pair of full race ones at some point, so I expect some fairly decent abuse.