1987 CHEVROLET V20 PICKUP, THM700-R4/4L60/MD8

By: Christopher Hinkle On: 02/27/11

9 comments

Vehicle

1987 CHEVROLET V20 PICKUP, THM700-R4/4L60/MD8

Vehicle Information

200000 Miles
6.2 L
8
Automatic
4 X 4
Snap On

Problem Information

1-2 bind, lost reverse
smoked lo-rev clutch after overhaul
all hard parts replaced
I built trans with SK senior, so lock would come on regardless and stay cooler, trans was an early 83, so I transfered all the guts(pump to output shaft) from a '90, pluged the aux passage in the pump where the tube went into. used 83 valvebody with SK senior and SK gaskets on a 83 case, after rebuild line psi in park and nuetral was 135, had very harsh forward engagment, psi in drive 80 with good line rise, rev was 90

Problem

smoked lo-rev clutch on first test drive, felt like LR clutch was not releasing in 2nd or 3rd, then lost rev and no hold back in man1, I have made so many mods and changes and extra time into this trans so it would hold up behind the 3/4 ton & diesel, please help!!!
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Vehicle Data
1987 CHEVROLET V20 PICKUP

Mileage 200000 Miles
Engine 6.2 L
Trans Automatic
Trans Type THM700-R4/4L60/MD8
Drive 4 X 4
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