giosoccer20

okay so within the past 2 months I've had the entire rear end rebuilt. that requires the driveshaft to be removed, correct? and to remove the driveshaft, my slp loudmouth would have to be moved out of the way, right?

I'm asking because today, I got an expert mechanic at my jaguar dealership change the oil, and I told him about the vibration problem. He looked under the car, and instantly saw the fact that the resonator was rubbing against the driveshaft, and because of that, there is now a groove in it. He said that that is definitely the problem.

I want to put the blame on my mechanic who did the rear end job, because if in fact the exhaust is moved when taking apart the rear end, then he put it back together incorrectly, causing the rubbing, causing the wear on the driveshaft, causing the vibration that I've been feeling ever since that time period when I had the rear end done, and new wheels and tires put on. I've already had the wheels balanced twice and all that, so I'm 99% positive it's not wheel related anymore. what do you guys think? and it's not just a discoloration, it looked like my fingernail could catch on it (i haven't tried, however).

I will punch my mechanic in the head if he caused this, and demand a free replacement because I am 100% entitled to it

giosoccer20

could the fact that the exhaust is rubbing be the cause of the vibration, and not the groove?

PontiacFan

iTrader: (104)

Photos available?
Sure, it could have been the reason for the issue you felt/heard.

Sounds like you need to go visit your rear-end guy, & make him pay/do the fix.
And then give the old driveshaft to him, right up the rear, ...,.

giosoccer20

hahaha. Well I talked to him, he said that he never touched the exhaust when doing the job. I don't know if I believe him? Is it possible to swap out a differential without having to touch the exhaust?

He was also saying that he thinks the exhaust only touches when the car goes over bumps or stuff, because he said he was aware of it before. I know that stuff doesn't exactly sit the way it looks when it is on the lift, as when it's actually on the ground. the car had 18" wheels before, and I never felt the vibration. I now have 17" and maybe that effected the clearances? especially when going over bumps? I mean, I drove the car today, and I cannot - for the life of me - hear any rubbing sound or something similar to it.

I found this thread yesterday, and this is exactly what my problem is. It's the resonator. I'll be taking it to my mechanic so he can do that alteration to the exhaust to fix the clearance issue https://ls1tech.com/forums/general-m...r-heellpp.html

I have the jaguar mechanic and my friend speculating that it's the contact of the resonator to the driveshaft which is causing the vibration, not the groove. So I'll see what happens

jimmyblue

iTrader: (11)

I've seen this in some of my exhaust swappage, it
just needs you to shim the plumbing away from any
& all close stuff by about an inch with all the joints
loose, force the pipe up tight (given the shimming)
and then tighten it up in a no-contact position.

Wheel size does not alter body clearance or driveline
angles - that's entirely springs.

Last time, driveshaft only engaged the I-pipe under
hard braking, and only the balance weight was hitting.
May be that only an extreme squat puts the pieces
against each other.

giosoccer20

okay, interesting. When it was on the lift, the exhaust was in contact the entire time. Does this mean that when on the ground, it's touching the entire time also, or the opposite? I just want this damn vibration gone. My mechanic said it could be bad U-joints, but I had another mechanic check those a few weeks ago and he said they were okay. I don't even know which mechanic to believe anymore lol. I still have to get around to putting the 18's back on in the back to see if that changes anything. haven't been able to do that yet

and here's a noob question, what do you mean by shimming?

RPM WS6

iTrader: (3)

If the exhaust is contacting the driveshaft, and you have a vibration issue, then it only makes sense to fix the exhaust (move it....and if you can't, get an exhaust shop to do it) and see if that helps. Either way, it should be fixed.

giosoccer20

Yeah i will get on it asap. Cant until the weekend, unfortunately

01WS6/tamu

iTrader: (37)

Exhaust is not touched during rear axle overhaul or complete removal. It's not in the way nor does it need to be removed for any bolt or nut removal.

giosoccer20

That's what I was interested in. So my mechanic wasn't bs-ing me. Good. I'm just shocked why he chose not to do anything when he said he was aware of the problem...sorta baffling lol