I'm going to do one TH400 build this year even though I'm pretty much retired from all of that. It's for a good friend and customer and will end up in his FAST Class early Firebird.
The last time I did a TH400 it was just shy of $1000 parts and labor. This included a 4L80E drum with a 34 element sprag, spiral lock ring, and steel apply piston with molded seals on it. I also replaced all the bushings, thrust washers, torrington bearings in addition to steels/frictions, both bands, sealing rings, seals, gaskets and small parts.
I did notice that the price of parts has just about doubled post COVID, so that number will be considerably hiring on the next one.......
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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