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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 is engaged the RPMS are ramped up slightly, to about 1800.
Flushed system. Replaced fan clutch, thermostat, water pump. Water is circulating well.
There are no leaks I can find but I am loosing coolant. After it cool down and I open the radiator cap I've lost a lot of coolant.
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?
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