rear end grinding noise - Engine and Car Noises


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Auto Repair Home>> Automotive Repair>> Engine and Car Noises

tigerpaw
New User

Jul 28, 2009, 5:36 AM

Post #1 of 4 (4613 views)

rear end grinding noise	Sign In

To whom it may concern: This is my first post. I have a 1997 Trans Am WS6. The problem i have is around the rear end, that once i have driven the car for a while it sounds like loud popping, gears grinding together. it only does it when i am either turning left or right. if i drive straight, there is no sound and drives just fine. when i come to a stop and turn either left or right, it sounds like loud crackling, popping in and around the rear end. i have looked under car and can't find anything loose or cracked. i have replaced the rotors and brakes, also just put in 410.1 gears about a year ago. the whole rear axle has all new bearings. the weird thing is that when i first start driving the car it does just fine weather i turn left or right, no noise. it usually take about 20 to 30 miles before the noise starts and like i said only when i am making turns.

just a note, i have taken the tires of and the pumpkin cover. the gears look brand new and i could not find any wear on them, the axle's are tight and when i spin them everything is nice and quiet. no loose play. i also checked the drive shaft and it is solid with no loose play. I AM STUMPED. can you help.

Thank You,
Tigerpaw

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 28, 2009, 7:54 AM

Post #2 of 4 (4606 views)

Re: rear end grinding noise	Sign In

That's easy.
You have a limited slip differential and the clutches are chattering.

Drain all the gear oil and refill it again but add a bottle of differential friction modifier. You cqan get it at most any auto parts store.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

tigerpaw
New User

Jul 29, 2009, 1:41 AM

Post #3 of 4 (4595 views)

Re: rear end grinding noise	Sign In

Thank you very much. looks like that was the problem. Hard to believe that all that noise came from the wrong type of oil used.
Thanks again for your help, job well done.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 29, 2009, 2:32 AM

Post #4 of 4 (4591 views)

Re: rear end grinding noise	Sign In

Glad we could help

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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