oh that sucks, make sure to watch your coolant level closely and put a couple miles on the truck, if the level drops then you probably slipped the gaskets! If the level doesn't drop then you probably got some coolant into the exhaust thru the heads no big deal it'll burn off eventually! You did use the correct fel-pro gaskets right?? the MS98000T set with permadryplus gaskets?? Hopefully you did, the alternatives suck and will eventually leak again!!