OREO Speedwagon

And no, it's not gas...

:nono:

Seriously, though... When I take a sharp turn and get on the gas a bit, I notice a clankish sound coming from the rear end. It only does it when I take a turn, and I've never noticed it when I'm on the straight aways.

Any ideas as to what this may be?

Desertdawg

Mine does this a little, it is the axel shafts slipping in and out of the diff.

I know there is a fix for it, but since I haven't done it yet, I haven't done any research....


I'm sure someone will chime in here for you. :seeya

Mystery Machine

Mine made a similar sound on hard right and left hand turns. I swapped U joints (all 6) and the sounds went away. :thumbs:

jerryp58

If you haven't done it already, a fresh fluid change (with posi-additive) is a good place to start.

If that doesn't do it, I'd hope for the U-joints versus a probelm in the diff itself.

Good Luck.

vettfixr

:iagree:
When I changed the fluid in my diff I didn't add the positraction additive and it did the same thing that your diff is doing. I drained a little of the lube out and put the posi additive in and haven't had a problem since.

OREO Speedwagon

Thanks everyone, I'm a newbie to DIY auto mechanics and haven't even considered changing the differential fluid.

I really appreciate all of your help and I'll let you know if it does the trick or not!

:)

Alwyn678

Good luck...You will really love the smell of the differential fluid :nonod: don't forget te Posi-Lube

jerryp58

"I'm a newbie to DIY auto mechanics "

You can search the archives, but in case you're not aware of the differential set-up; unless someone has installed an aftermarket differential drain plug, you have to pump the old fluid out through the fill hole before you can add the new fluid & posi additive.

Jerry

72GACRZR

After you get it changed , take the car to big empty parking lot and do several tight turns both ways and a few figure eights(all at low speed) to work the posi lube into/onto the plates.

mpettus

I had a problem with the rear end in my 68 making noise and it was cured by replacing the rubber mount in the front and retorquing. May not be the same problem as mine made a "clunk" under hard shifting, but it is another idea.

Matt

vettfixr

Not necessarily. I used a vacuum pump going into a jar to pull the old fluid out. I believe you can also get a vacuum pump for these kinds of fluids at auto stores. Beats dropping the diff.

jerryp58

you have to pump the old fluid out through the fill hole before you can add the new fluid & posi additive.

Jerry



...versus...

Not necessarily. I used a vacuum pump going into a jar to pull the old fluid out.

Are these two different :confused: :confused: :confused:

Jerry

vettfixr

There are two ways to remove the fluid. One is the remove the diff and drain the old fluid out of the fill hole. This is OK if you don't remind removing half of the rear end of the car or if you are already doing a diff rebuild. If you don't want to do this you can get a suction gun from one of the auto stores and draw the fluid out of the diff through the fill hole. Nothing has to be removed to do this. You can then fill it with the proper fluids and you should be OK.