The fluid and contents of the pan will tell you the condition of the internals. It a good portion of the transmission is in the pan, then it probably needs some attention.
You can perform and air test with the pan off to verify the function of the clutch packs, and detect any excessive leakage at the seals/sealing rings while the valve body is off the unit.
For the most part, if the trans works good and the pan isn't full of debri, fluid not burnt, it will respond fine to the installation of a "shift kit". Shift kits are not meant to save or extend the life of nearly worn out units!.......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
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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