BANG in the rear end

[Inferno]

Before I start, I had 2 amazing kills this weekend. I took down an 03 cobra with 500rwhp and a RX7 putting down about 440rwhp. Both were clean wins by more than 2 car lengths from 40mph till about 1/2way through 4th. My car and I helped some people realize why the Viper has a killer rep. Anyway, that's off topic. My question is this; in one of my runs I downshifted on a roll, the shift caused the revs to go up to mid/high 4000's. I have done this before with no problem,( not very often at all because I don't normally drive the car that hard), but this time I heard a fairly loud bang from the rear end. The car drives normally, and this is good because I thought I may have damaged that halfshaft thing I have heard folks talk about. Any ideas what this sound was, just the car letting me know I'm driving a little too hard?

 

[Ulysses]

You hit the rev limiter.

 

[Inferno]

You hit the rev limiter.

The rev limiter just cuts out the engine doesn't it? Even though it made a thud, it still kicked in and I took it up to almost 6000 before I shifted.

 

[Cal Cobra]

I've had this happen before too when jumping on it going from 3rd gear to 2nd....sounds a little scary, but everything seems fine afterwards.

Is it just the rear end binding up to grab traction?

It's definitely not the rev limiter.

Cal

 

[carguy07]

If you don't match the revs well with your speed you can get wheel hop. More from engine braking for a second than from spinning from power. A lot of people think that they are getting rubber between gears when they hear the chirp. A lot of times it is just the wheels spinning SLOWER than the car. Just a guess.

 

[1TONY1]

BANG in the rear end

Oh......I must have a dirty mind sorry

 

[AviP]

It happened to me twice way back in 97 or 98. Sounded exactly like you described it "BANG in the rear end". Both times it was while moving from a light. Each time it happened, I got out and checked under for any signs of damage but found nothing. All I could guess was that it was due to some gear not meshing in properly or the u-joints locking up and releasing suddenly. It has never happened since.

 

[Cal Cobra]

BANG in the rear end

Oh......I must have a dirty mind sorry

Oh $hit here come the Richard Simmons pictures . . .

On a serious note, it would be really nice to know about this... doesn't seem to hurt anything, but scares the heck out of ya when it happens.

 

[Tom Sessions]

Does it sound like someone hit the frame with a sledge hammer whe it makes the noise?If so you will need to check the diff mounting bolts.There are 4 that hold the rear diff in the car.They al torque to 100 ft/lbs.I has seen quite a few cars that do this sometime on a hard upshift or on a down shift at a hi rate of speed.Hope this helps.

 

[Cal Cobra]

Tom that is exactly what it sounds like. Thanks for the tip, I will definitely check this out. I assume you're saying that we should be looking for a loose diff mounting bolt?

Thanks,
Cal

 

[Inferno]

Does it sound like someone hit the frame with a sledge hammer whe it makes the noise?If so you will need to check the diff mounting bolts.There are 4 that hold the rear diff in the car.They al torque to 100 ft/lbs.I has seen quite a few cars that do this sometime on a hard upshift or on a down shift at a hi rate of speed.Hope this helps.

I will check these bolts, thanks for the tip bro.