1994 GMC Vandura 3500 Questions

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i have a 1994 vandera 3500 6.5 diesel and there is no dash lights or glow plug lights the gauges tern signals arnt working it terns over but wont start iv checked the fuses and changed the glow plug controller i ...
When I start my truck in the morning it will not shift out of low gear. when it gets to 170 degrees I can shut the truck off and turn it back on and it will shift normally. But if I do not shut the truck off it will n...
when i goin the the hiway and is an slope , the speed go down drasticly from 65 to 35 mph., lus power..
i have a 1994 gmc vandura 3500 with a 5.7 engine i want to know what kind of trans mission it carries .
Our van will overheat frequently and VOMIT out anti-freeze through the overflow. Very annoying. I don't think it's the head gasket, as it doesn't do it constantly.... Thermostat? Water pump? Something else?