Does your truck have an automatic Trans ? A vacuum modulator that is bad will suck the trans oil out of the pan and smoke like a steam train.If It's a stick shift,do what Wrenchbender Ret. suggested.

Wanted Good Woman:
Must be able to cook , clean , sew , tune engines and polish trucks. Must have old Stovebolt and garage. Please send picture of old Stovebolt and garage.