The exact items needed and course of action for rebuilding will depend on the year/model of the TH350. I would recomend having a FULL set of bushings and thrust washers installed, all new steels/frictions/new band, both roller clutches, modulator and shift kit. Use Raybestos or Borg Warner clutch material, avoid any relined frictions or band. Replace all the sealing rings and check the case lugs in the center support area for wear. The TH350 does not need a lot of tricks. I would not disable the accumulators or remove the springs as recomended in many shift kits. Do not remove the waved apply ring for the int clutch. Use the correct apply pistons for maximum clutch capacity in each drum. If you want to increase the strength of the low sprag you can install a center support/sprag from an 87-up 4L60 trans. I have TH350's behind 455's running well into the 10's without any troubles other than occassionally snapping off the case at the bellhousing area. They seem to be weak in that area, but no concerns behind the 350 engine.....Cliff
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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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