two qeustions

two questions

1. What computer goes with a 347 stroker?

2. Since I got my rear gears done a few months ago I get a really hard "THUD" when ever I hit a dip in the road going at speed limit. It seems to be isolated to the RT rear. could the guy have screwed something up? I took the wheel off and I didn't mnotice anything except that when I grab the lug studs I can moved them slightly. with the tire on it doesnt move. any thoughts?:shrug: