Hey...New here Just bought a 79 Chevy 1/2 short box from a buddy of mine. He sold it to me thinking that the tanny was out. After lookin it over found out there was a vaccum hose on the tranny with a hole in it. I replaced the line and the part? ($10 fix) great...... Well started it up, let it warm up topped off the tranny fluid and took off. 1st, 2nd, and 3rd shifted like it was new. Drove it about 10 miles, put it back to the shop to tweek some minor crap (shocks, rims & tires). Took it out. Only get about a mile sounded like it shifted to low. Blue/white?smoke out the dual exhaust. Would hardly run. Cripple home, oil had water or tranny fluid in it? Is this a head gasket issue? Vaccum issue? Any ideas I have not dug into into it yet. Worried!! Really strange, cause like I say it was fine for 10-15 miles with the new vaccum and hose? Any help would be much appreciated!!