I just put in a TKX 5 speed with 3:27 gears (9 bolt BW). I have the .64 overdrive and 2.87 first gear. Love this combo. At 70mph just a hair over 2000rpm. The TKX is physically smaller than the TKO with same torque rating plus they upgraded the shifting mechanisms for 7500 rpm shifting , not really applicable for Pontiac’s. I did a lot of research on the 6 speeds and decided wasn’t going to use the 2 overdrives as much.
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