hi, got my engine put in saterday and took my sammi out sat night and sunday in the local river bed. 2 foot high whoops and a couple jumps for 10 hours. toward the end when i would go up a whoop de doo and then come down the front end made a noize i thought for sure was one of the moter mounts that had busted but i looked today and there seems to be nothing wrong with them. when i come down i get a ka dunk sound like if the moter was lifting an inch then falling. could this be something on my front drive shaft or my tranny mount or does anyone have a suggestion? thanks in advance, 6feet