Considering the cost to upgrade to an OD trans or Gear Vendors, you might consider upgrading the TH-400 with a low gear set and dropping the rear gear ratio back to 2.73-3.08. About the same on the starting line with lower rpm's for "normal" driving, etc.
A LOT less money and still excellent street performance with lower cruising RPM's....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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