Mechanics

DIFFICULT SHIFTS

1984 GMC S15

Transmission problem
1984 GMC S15 6 cyl Two Wheel Drive Automatic 140000 miles

I have a 1984 G. MC. 2WD S-15 2.8L V-6 pick up.I just got it and don't know wether it has the 700R4 or the 4L60 trans. When I put it in OD its like being in neutral. In D it drives but has difficulty upshifting but its not slipping. At around 25 mph when it downshifts into first it does it hard. The fluid is up to level and clean.I read in a manual both trans's have a internal electric control selenoid do you think that could be the cause?I am planning to drop the pan and replace the fluid and filter when it warms up here. Do you think it could be something else that I may be able to fix myself?I have worked on cars for yrs but never have done any extensive work on an auto trans.I really don't have the money to have it re-built. Thank you I appreciate your time and knowledge.
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Bill Sobjack
March 21, 2008.



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