T-400 tranny
 

What's the difference between a th400 and thm400 valve body's? And if there is any, would it take the same rebuilt kit? Thanks

th and thm stand for turbo hydromatic not many changes threw the yrs
64 was single range 65-66 had a varible stall speed converter
then in 87 they added a extra check ball but for the most part there the same from 67-87 some shift firmess calibration was diffrent from vehicals
87 -90 had a difrent valve body and seperator plate

So, can the th400 and thm400, use the same valve body kit? As a regular th400. Thanks

what kit are u looking at band m goes from 87 back i think trans go is for all yrs

TCI GM TH400 REVERSE SHIFT PATTERN FULL MANUAL VALVE BODY with Engine Braking

any thing from 67 to 87 will keep u on the safe side