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GMC Sierra 1990 no reverse


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GMC Sierra side step 5.7 auto. 700R4 tranny.

Not been run for a while suddenly lost reverse. All forward gears and neutral.

stripped the pump body, cleaned, rebuilt with new gasket and seals, replaced a broken spring in aux pump body. 

New fluid.....all forward gears, neutral but once agsin no reverse. Anyone any ideas?

thanks 

Mike

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