armyed

Whenever I have someone in my backseat and I hit the gas hard a vibrating noise thats very loud comes from the back right side. But when noones in the backseat it doesnt make the noise. HELP[:@]

99saleen351r

Sounds like the tire is rubbing.Did you look around to see if you could notice anything(rub marks,loose parts,ect)

armyed

im going to put it on a lift today and inspect it to look for rub marks, ill post what i found

armyed

well I looked back there and didnt see any tire rub. Now, I have the Eibach lowering springs and KYB GR2 shocks on it. I checked the back right shock when my buddy got on it and saw no play or vibration on that so I know its not one of those. I also looked at the back of the car when I had someone in the back seat and it was really low with just one person in the back which is kinda odd to me. The noise is definitly coming from the back passanger side around where the shock tower is.Any idea what it could be?

wildstang87

this is a tricky one, a vibrating noise??? if it squats enough the driveshaft could be rubbing your exhaust. other than that, i cant think of nothing

armyed

Ok tommorow its going on the lift and im going to check every bolt and anything else it could be. Ill check the driveshaft as well cause I heard something about that today from my father. It does sit a lot more then you thought it should when someones in the back. Now if it is the driveshaft what can I do to fix that problem?

wildstang87

actually, im sorry, when you lift the back end the driveshaft gets closer, not the other way around, anyways, make sure the pinion snubber isnt all beat up like its been hitting alot. you might have to trim it down a little

wildstang87

make sure its a drive on lift, or the rear suspension will be sagging and you wont see any potential problems

armyed

ok well I found out what the problem is today, The driveshaft is hitting the bottom of the car when I get on it and the backend drops. I really dont know why it does it cause I put on the eibach springs that only lowered it like an inch in the back and the kyb GR2 shocks back there. I might go and get a bigger snubber for the pumpkin so it doesnt drop as much down when I hit it, right now it has the snubber that is really small that came with the Eibach springs. Is there anything else under there that could be causing this sage? does anyone have any other ideas on how to fix this without taking off the snubber that came with the springs.