1991 Chevrolet G Series Van (G30) Questions

All 1991 Chevrolet G Series Van (G30) Questions

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It is a problem getting the 4wd to work, it just slips out of position.
I had to by pass valve cause no fluid went to rear brakes
Carpet cleaning van. Cleaning unit is van powered by a driveshaft engaged with an electric clutch. Van drives fine with no temperature issue. When I engage the system it will slowly go to overheat. When the system i...
broken wheel studs what do i do to fix this?
My transmission shift from 1st at 10mph and into 2 at 20mph but will not shift into overdrive. Is this controled by the computer module under the drivers seat?