Rotary Powah

iTrader: (1)

Just got my car done today, after putting a gsl rear end on it, and when I'm moving at any speed, and there's no load on the drivetrain, theres a vibrating noise that increases in frequency the faster you're moving. It was happening on my old axle too (hit a curb with that one) And I've tried two different driveshafts. Both of them with the same result. What could it be?

IanS

iTrader: (4)

Have you checked to make sure your wheels are in alignment and tires balanced?

Rotary Powah

iTrader: (1)

Yep. It even made the noise without the wheels when i had it jacked up. And it doesnt make the sound under load.

IanS

iTrader: (4)

OK what about wheel bearings?

Edit: Should say Axle bearings.

Edit 2: Have you checked for excessive play in the driveshafts? I suppose its possible to have 2 different ones and both with a bad U-joint.

Edit 3: I love my 82 GSL rear and driveshaft I have!!! Replaceable U-joints FTW

AcidAngel7477

iTrader: (16)

did you make sure it has gear oil in it?

:AA:

Rotary Powah

iTrader: (1)

It has oil in it and there isnt any play in the driveshaft

mazdaverx713b

iTrader: (91)

have you checked your transmission mount? check for cracks and seperation of the rubber insulator from the metal bracket.

Paradox

iTrader: (1)

is it coming from the rear end? might be the clutches are worn out.

DivinDriver

iTrader: (15)

+1

Also looseness or breakdown in the rubber isolators that mount the transmission rear mount to the frame. & just for safety sake, check your trans lube level.

AcidAngel7477

iTrader: (16)

true...i remember awhile back getting some noise and i replaced the trans mount..fixed it right up...but then again i did take a good look around and guessed.

:AA:

Rotary Powah

iTrader: (1)

That seems like it would be the case.. and I did hit a curb which might have jolted them out of place or something..

Devy55

iTrader: (2)

Mine was a wheel bearing going bad.

Try pulling each side rear axle and inspect the bearings for wear.

Rotary Powah

iTrader: (1)

I mean it's like a pretty loud noise like a thunk sound towards the back whenever load is taken off or put on and it sometimes does it, sometimes not. It almost seems like it depends on the weather

IanS

iTrader: (4)

I would check all links and bushings of said links to make sure that nothing is bent/broken or bushings missing or severely deteriorated. Also check (cant remember name) the links that hook to the body on the left and right sides. These are known to rust away and break off.

Edit: All the links and bushings I refer to are also connected to the rear end.

trochoid

iTrader: (6)

Control arms Ian, control arms.

If it's a slapping/thumping sound, then maybe one of the control arms has failed. Allowing the rear axle to rotated up/down and hit the body with the housing or driveshaft. Then there's the possibility one of the mounts for the sway bar failed too.

IanS

iTrader: (4)

YES control arms. Thanks man lol

datfast1

Replace the both Wheel Bearing. I had the same problem. First noise then vibration then the bearing freeze on me. Lucky it happen in the side street. It can also be the bearings in the diff too.

rxmadness

iTrader: (1)

well i also had that exact noise but when the rear end wasnt under load(clutch in or coasting) for me i used to have an open diff and the spider gears where worn into the casing and the thrust washers were slapping around lol fixed that by welding it all together till i got my GSL diff haha