1999Transamman

iTrader: (18)

Lately while launching off a dead stop, I get a popping noise. Im not sure what it could be, I have checked the tranny fluid, filter ect... with nothing obvious, I also checked the diff and didnt notice anything wrong, no chipped gears ect... I did find a bad u joint and went ahead and changed both. however the noise is still there. I have played around with it to try and find a pattern, and can only get it to happed when I do a hard launch. I tried cruising down the highway and going WOT, and it acclerates great. Any suggestions would be great. Im at a loss at what it could be.

GregWS6&z28

iTrader: (8)

torn tranny mount? pipe hitting under the car? how loud is it, where does it sound like it's coming from?

1999Transamman

iTrader: (18)

Its not real loud, it sounds like its coming from the rear end but I am open to anything. The exhaust is pretty secure and doesnt really have alot of play in it so i dont think it could be that. Torn tranny mount you say, but wouldnt the noise happen during normal driving?

DanZ28

iTrader: (5)

Stock rear end?

I've heard some posi units with a popping noise. You added the GM additive right?

Dan

~RedLineLs1~

iTrader: (1)

I had the same problem you're describing. Except mine would also do it at a VERY slow creep, only sometimes though. It always did it when I launched. Turns out my tranny mount was bad. I replaced it and the popping went away.

TopFlite

Maybe your catback is loose?

brady346

iTrader: (13)

I have the exact same problem you described except mine does it randomly. I can just be creepin along and it does it or even at a hard launch. It is not constant though.

jimmyblue

iTrader: (11)

I have popping now (heavy) since putting a used
adjustable torque arm in there; enough play in the rod
ends I guess. Engine braking followed by acceleration
works the slop, stop-to-stop.

******* the lower control arms and torque arm mount
hardware down tight, would be a good start.

1999Transamman

iTrader: (18)

Its the stock rear end, and I do put the additive in. I played with the exhaust today and dont think it could be the cats hitting the car. I think I will try the tranny mount and see what happens, heck it wont hurt anything to change them.

DanZ28

iTrader: (5)

To check that you should be able to hold the brake, put it in gear and give it some throttle. if it's the tranny you should be able to hear it.

1999Transamman

iTrader: (18)

will it make a popping noise like it is shifting hard?