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What's wrong with my Turbo 700R-4/4L60 Tranny - pics incl'd

Tech talk for GMH/Isuzu and Great Wall owners

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Posts: 27
Joined: Sun Apr 04, 2010 11:34 pm
Location: Brisbane

What's wrong with my Turbo 700R-4/4L60 Tranny - pics incl'd

Post by robertbruce »

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...

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Posts: 27
Joined: Sun Apr 04, 2010 11:34 pm
Location: Brisbane

Post by robertbruce »

got the final clutch pack out.... problem is lo-rev clutch's burnt out...doesnt seem to be much else bar a seal=kit...
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