What's wrong with my Turbo 700R-4/4L60 Tranny - pics incl'd
Posted: Tue Apr 20, 2010 11:50 am
I am rebuilding my THM700R-4 transmission.
It goes into a heavy 4x4 Coaster bus with 350chev engine
the symptons where...
No power in reverse, ie, would engage but slip then slip like crazy...
1-2-3-OD fine, not sure if lock-up was engaging...
First-gear overrun - ie, no engine braking...
Front pump seal may have fallen apart during removal, however, I am finding bits of it everywhere...
Valve body seals were perished on the out-side of the valve body.where they run out past the valve-body edges...inside seemed ok but the top one did tear easy during an unforced light removal
SunShell is fine, sunshell gear fine
the only thing i can notice amiss is the tang jutting out of an assembly plate, but it seems to have a key on the plate but not sure.. is first couple of pics
any assist muchly appreciated...
It goes into a heavy 4x4 Coaster bus with 350chev engine
the symptons where...
No power in reverse, ie, would engage but slip then slip like crazy...
1-2-3-OD fine, not sure if lock-up was engaging...
First-gear overrun - ie, no engine braking...
Front pump seal may have fallen apart during removal, however, I am finding bits of it everywhere...
Valve body seals were perished on the out-side of the valve body.where they run out past the valve-body edges...inside seemed ok but the top one did tear easy during an unforced light removal
SunShell is fine, sunshell gear fine
the only thing i can notice amiss is the tang jutting out of an assembly plate, but it seems to have a key on the plate but not sure.. is first couple of pics
any assist muchly appreciated...