My truck has a new motor and rebuilt transmission but it's not moving replaced transmission with a new one still no movement both transmissions go in to gear . They only work in high rpm. I replaced governor gear, module, flushed lines , changed filters, I have a new vacuum line hooked up new coolant lines. I took off the differential cover no metal shavings. I put my truck on blocks dropped drive shaft transmission changes gears fine I put the shaft back on no movement. Drive shaft does have about 3-4 inches of play maybe to short
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