I cant seem to figure out why my truck doesnt want to start from a stop smoothly!!! (Its an 87 with 350 SM465 6"lift and 35's 8lug 4.10) The symtoms are - once the truck gets hot I cant seem to feather the clutch to keep the truck from bucking. Its like the clutch doesnt slip at all, it bangs hard between grab and let go, grab and let go. Its terrible and it makes driving the truck a pain in the ass not to mention I look like a jackass. So here are my diagnosis: The clutch is only about a year old and I didnt clean the packing oil off of the pressure plate when it was new and maybe the oil has impregnated the fibrous clutch disc causing this problem. Bad motor mounts. If the mounts are not strong enough to hold the motor down, maybe it would amplify the vibration. Any ideas here guys? this is making me crazy!