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Chevy/GMC Trucks \  TH350 Transmission Problems

TH350 Transmission Problems

Chevy/GMC Trucks Make Specific
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NaviGangsta   +1y
The motor/transmission was fine when we took it out of the truck it was originally in. But sat in a corner for 3 years before we put it in an s10. It shifts into gear fine when I first crank the motor. But once the tranny warms up it just slips and wont move at all.We dumped the fluid and then refilled it with new, but didnt change the filter.Is there a chance that if I changed the filter and put one of those Lucas additives that it might work? Or does it flat need rebuilt. We already blew our budget on this project, so Im trying to decide what would be most cost effective.

Any help or opinions would be helpful.
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