Rear axel-differential whining

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Joeype70
Posts: 65
Joined: Fri Aug 18, 2017 2:27 pm
Your car is a: 1979 Pininfarina

Rear axel-differential whining

Postby Joeype70 » Mon Sep 25, 2017 7:04 pm

Hi all, I changed the rear axel oil and boy what sludge came out. She's whining still and my question is, will it get better now that its filled with fresh fluid? It also has a bit of a leak on the seal where the drive shaft meets the rear axel, whats the best way to stop this? A few people mentioned adding Blue Devil or Bars leak? Any feedback would be greatly appreciated. By the way the car runs great!!!
Last edited by Joeype70 on Thu Sep 28, 2017 7:19 pm, edited 2 times in total.

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RRoller123
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Posts: 8179
Joined: Sun Nov 13, 2011 2:04 pm
Your car is a: 1980 FI SPIDER 2000
Location: SAGAMORE BEACH, MA USA

Re: Rear axel-differential winding

Postby RRoller123 » Mon Sep 25, 2017 8:28 pm

There was a really good write up someone did here a while back on replacing that differential oil seal. Very detailed and well written. It should be able to be found with the search function.
'80 FI Spider 2000
'74 and '79 X1/9 (past)
'75 BMW R75/6
2011 Chevy Malibu (daily driver)
2010 Chevy Silverado 2500HD Ext Cab 4WD/STD BED
2002 Edgewater 175CC 80HP 4-Stroke Yamaha
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Joeype70
Posts: 65
Joined: Fri Aug 18, 2017 2:27 pm
Your car is a: 1979 Pininfarina

Re: Rear axel-differential winding

Postby Joeype70 » Tue Sep 26, 2017 2:49 pm

Thank you!

bluespider262
Posts: 160
Joined: Mon May 25, 2015 11:14 am
Your car is a: 1979 Spider

Re: Rear axel-differential winding

Postby bluespider262 » Tue Sep 26, 2017 4:48 pm

If winding = whining and excessive noise, that's a bad sign but not necessarily rebuild time. Its certainly not going to get better with a fluid change alone though.

I would disconnect the drive shaft from the pinion yoke and make sure that yoke has no side-to-side play. Not rotational play but lateral play, so try to move the yoke either up and down and towards/away from the wheels/tires and see if it moves a bit.

Reason I say this is that if the pinion seal is leaking, odds are good that its because the pinion itself has too much play, esp. on a 79 or newer rear end.

Check that and report back.

Joeype70
Posts: 65
Joined: Fri Aug 18, 2017 2:27 pm
Your car is a: 1979 Pininfarina

Re: Rear axel-differential winding

Postby Joeype70 » Tue Sep 26, 2017 9:32 pm

Thanks for the guidance


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