what could cause white smoke comes up between the cab and bed?
No white smoke out of the exhaust? Maybe you have something leaking onto the exhaust. What does the smoke smell like? Water vapor or burning oil?
White smoke does come out of the exhaust but the smoke from under the cab smells like transmission fluid.
White smoke from exhaust pipe means coolant is getting into the combustion chambers, usually a blown head gasket. White smoke coming between cab and box means some type of oil is getting on a hot exhaust system, if it smell like trans fluid then it most likely is a tranny leak.
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