Well.....Here goes.... I was driving down the interstate all by my lonesome and wanted to do a 6th to 3rd pull at 75 MPH. Shifted smoothly, let the clutch out/dropped the hammer at the same time and heard a single lound knock/bang/slam under the car that sounds like it comes right behind the front seats. I thought maybe I hit something. Then yesterday I did a second to third "hard" pull and the same slam came back. No driveability issues, no vibes, wont make a sound unless under hard shift. I got under the car and looked at all rear end connection points, nothing. Looked at the trans attach points, nothing. Everything looks fine. I was extremely disgusted when I seen the driveshaft and the way it designed. With it having a carrier bearing and the new style joints....Is it possible that the drive shaft hit the tunnel? Any advice is greatly appreciated.
Loud Bang after shifting HELP
- Thread starter yosemiddysam
- Start date
Keep in mind this was my 2012 GT500.
Drive Shaft. Lowered? 1 piece Shaft?
Not lowered and it is the factory driveshaft that looks to be 3 pieces.
Hmm. Wouldn't think stock shaft would hit at stock ride height.
Any vibration?
No Vibration. I was counting the carrier bearing as the 3rd peice. The shaft is two. No marks that I could tell during a very quick look. I hate to take it to the dealer and say "It only does it when you shift hard" Then some snot nosed kid will have a reason to hot rod my car. I plan on doing the relocation brackets, upper and lower control arms soon. Will not do it under moderate shift/acceleration. No noises while going over bumps either.
Car has 15000 miles on it. I bought it with 12,500 on it. I would sure hope that the bushings would not be bad already. This bang it makes about made me piss down my leg the first time I heard it.
It definitely sounds like a drive shaft issue. U joints could be bad. My best recommendation is take the car to the deal and have a tech go for a drive with you and 9 times out of 10 they don't let any dip shit drive or work on the GT500s. Or pull the DS and have it inspected.
I looked and it is the stock Upper and bracket. Just hope they dont find reasons to deny warrantee. We have some shady ass Stealerships here in Florida. Car is pullied, Tuned, and has an aftermarket uncatted X Pipe.
Is a 6th to 3rd at 75 too much to ask out of the car? My 03 Cobra did it for years and loved every second of it.........
It's your stock lower control arms. The soft rubber bushings compress under high instant load as in shifting really hard. What happens is the bushing will compress and there will be some contact between the arm itself and the center of the bushing where the bolt goes through to mount to the body.
Thats what I was thinking too. If I replace them do I have to buy the reloaction brackets as well? What is the best kit?
Sounds like the same problem I had in my '07. When downshifting and hitting it hard there would be a loud bang. I had tune, CAI, 2.6" pulley & tune. Also had the DSS one piece driveshaft. Took it to the dealership and they told me it the upper control arm couldn't handle the extra torque. I replaced the upper and lower with all BMR stuff and it seemed to make it better but the sound didn't go away completely.
Here is pretty much the setup I went with(adj. for a 2012):
BMR Upper Control Arm Mount (2011 - 2014) - Revan Racing, Inc.
BMR Upper Control Arm, DOM, On-car Adjustable, Poly Bushing (2011 - 2014) - Revan Racing, Inc.
BMR Bolt-in Control Arm Relocation Brackets (2005-2014) - Revan Racing, Inc.
BMR Lower Control Arms, Billet Aluminum, Polyurethane Bushings (2005-2014) - Revan Racing, Inc.
I upgraded my panhard rod as well since i was doing all the other stuff down there:
BMR Panhard Rod, DOM, On-car Adjustable, Polyurethane Bushings (2005-2014) - Revan Racing, Inc.
^^Agree with everything but the LCAs, get the Bob's, more or less the same, but much better price point 
Bob's Auto Sports Billet Lower Control Arms - Revan Racing, Inc.
Bob's Auto Sports Billet Lower Control Arms - Revan Racing, Inc.I had the same noise on mine when I banged 2nd real hard. That was with the stock suspension. After I changed to Roush w/spherical ends it never happend again.
Look at the very front of your lower control arm, at the apex of the curved part. There is a bolt that holds the parking brake cable bracket to the front of the bracket that the LCA mounts too. Some of the bushings get soft and when you get on it hard, the LCA moves forward and hits that bolt end (I think it's a pointed bolt).
If I remember correctly, it's the LCA on the right side that hits first.
It scared the CRAP out of me the first time it happened. It's LOUD, I thought I popped the rear window out from body flex.
Phill
Look at the very front of your lower control arm, at the apex of the curved part. There is a bolt that holds the parking brake cable bracket to the front of the bracket that the LCA mounts too. Some of the bushings get soft and when you get on it hard, the LCA moves forward and hits that bolt end (I think it's a pointed bolt).
If I remember correctly, it's the LCA on the right side that hits first.
It scared the CRAP out of me the first time it happened. It's LOUD, I thought I popped the rear window out from body flex.
Phill
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