sounds like a pump problem. In reverse the tranny generates twice the line pressure. so if the pump is going out it would take a while for the pressure to build up. If it has been this way for awhile I would suggest a rebuild as clutches have been slipping and creating heat which in turn kills trannies. check with your local tranny shop and see what they think though.
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1972 chevy super, long box, 402 big block (2,000 miles on rebuild) 2wd tach, tilt, tool box on bedside, a/c, sliding rear window, orange and white.
1972 Chevy Blazer 2wd, tach, tilt, a/c, my first engine overhauling experience, Orange, with white top
2006 Gmc Sierra, XM, Z-71, dark blue, onstar, leather, rear entertainment (audio only) heated seats, (the wife loves that feature) upgraded tires immediately after purchase to Goodyear Wrangler AT/S (hate those rock throwers that come from the factory)
BWC
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