PUDman

does anyone know why automatic tranny fluid is used in a manual 5 speed 1986 gt? i'm the original owner and the tranny is stock and works fine, but i just want to know why this is.

mjr46

there are many small passages and tight tolerances within a t-5 where viscosity is the primary concern for lubrication..gear oil and it's thickness would not be able to penetrate such areas fast enough to provide the proper and adequate lubrication

HACKGT350

borge warner actually recomends gm syncromesh for the t5 but ford went with atf because its ford

stang8689

I use syncromesh

redpony88

like mjr said, they have tight passages and regular gear lube wouldnt work. i use rp syncromaxx, it's made for manual trannys that use atf

PUDman

thank you all for the info. i never would have guessed. it must work because my stang and stock tranny have 357,800 original miles

HACKGT350

wow and i thought i had a lot of miles