I'm a little worried about the (reportedly recently rebuilt) trans in my new '64 Dart. It shifts really late (impossible to hit 3rd gear below 35 mph) even under closed throttle and even with the (stock, correct) kickdown linkage adjusted all the way short. I can't remember what else causes late upshift on the dual-pump Torqueflites. Previous owner mentioned a shift kit having been installed (uh-oh; tricky to do this right on the pre-'66 transmissions) and the rear axle is now a 2.76 rather than the factory 2.93 ratio. Charrlie? Anyone?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

With a shift kit installed, they may have cranked up the line pressure too high. Might also be a stuck governor.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Thanks, Charrlie. Any easy way to discern one problem from the other? And without knowing what sort of a "shift kit" might've been installed, how likely is it that dialling down the line pressure will cause other shifting problems?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Run some pressure checks... (see the FSM)
All the test ports are accessable from the outside.
The only trick is to find a pressure gauge that goes up to at least 250 psi
DD