Originally Posted by k1DBLITZ
I have a similar problem, but I have a manual tranny.
My car came with gears from the factory, and I don't notice any clunking when engaging forward moving gears or reverse. Like c_rizzle said, in fact it got rid of the clunk that occurred when shifting gears.
However.... I did obtain a NEW clunk that wasn' t there before. I believe it's the same one you're describing when you hit a "certain bump". I've only heard it maybe 4-5 times in 11-12 months... but since it happened the first time I've been very cautious about avoiding the bumps that cause the noise to occur. The type of bumps that cause it to occur are bumps that compress the suspension, or entering into a steep incline quickly.
I'm not sure if it's the driveshaft, or the exhaust making contact with something because I installed the following mods in relatively close succession:
4/5/2014 - Magnaflow Catback Exhaust - 3800 miles
4/18/2014 - Magnaflow X Pipe & Aluminum Driveshaft - 3900 miles
When I hear the noise, It sounds like it's coming from under the shifter just like you described. Do you have an aftermarket mid pipe installed?
I'm wondering if it's the e-brake mount? I've read that if the car is lowered you need to move the ebrake mount out of the way to avoid contact with the driveshaft.
My car isn't lowered yet... but I wonder if it's still making contact when the suspension is compressed? Dunno.. just a theory....
The way the whole exhaust system kind of floats in those hangers (not tightly held) I'm wondering if there's some movement going with the exhaust. A lot of aftermarket exhausts don't use all 3 hanger points either on each side which would allow more movement of everything.
So many variables....
Also, could be suspension related.
Have you checked your pinion angle?
Driveshaft & gear noise (problems) should be most noticeable when changing speed/acceleration.... hitting the gas, then letting off completely, etc... where there's going to be forward & backward.