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FE Power Forums => FE Technical Forum => Topic started by: 2ndgear on August 13, 2017, 02:07:52 PM

Title: 9inch. whine noise after 8 miles of driving?
Post by: 2ndgear on August 13, 2017, 02:07:52 PM

389 gear,locker. It seems after I drive the car for 8-10 miles the rear end starts to whine on acceleration and not on deacceleration.  Last time checked, the pattern and lash was good. Any thoughts? It seems like something is growing with the heat. Bearings,lash? Thanks for your suggestions.

Title: Re: 9inch. whine noise after 8 miles of driving?
Post by: Heo on August 13, 2017, 04:29:09 PM

I had the same problem on a Mercedes 500 SEC
10 -12 Miles it started to wine from what soundet
Just like the diferential..... It was the tear tires

Title: Re: 9inch. whine noise after 8 miles of driving?
Post by: 2ndgear on August 13, 2017, 08:05:45 PM

Thanks Heo for the thought but I did switch tire this spring to M/t street radials noise still there. Could it be a axle bearing? They are Williams axles in there. About 8 years old but only maybe 2000 miles on them. Well maybe this winter I will pull the 9 inch. apart and see whats up with it. Something to do. In Wi. the winters can be long.

Title: Re: 9inch. whine noise after 8 miles of driving?
Post by: Lowrider on August 14, 2017, 08:21:01 AM

Usually when you can change the noise by accelerating or deaccelerating it's a gear noise.

Title: Re: 9inch. whine noise after 8 miles of driving?
Post by: BattlestarGalactic on August 14, 2017, 08:36:07 AM

Sounds like it might be tightening up a bit with it making noise after driving it.   Give the pinion a wiggle when cold, drive it and see if it gets less lash after it starts making noise.

I think it is gear, not bearings.

Title: Re: 9inch. whine noise after 8 miles of driving?
Post by: e philpott on August 14, 2017, 10:25:37 AM

Make sure your driveshaft Yoke didn't come loose from the Pinion gear , if they loosen up it will cause noise load/no load on a perfectly fine set up otherwise ... your noise is from something in the "pinion " side of the Unit

Title: Re: 9inch. whine noise after 8 miles of driving?
Post by: gt350hr on August 14, 2017, 11:49:23 AM

  Loss of pinion bearing preload/ bearings seating. If you have a solid pinion bearing spacer , it needs to be thinner. If you have a crush sleeve the pinion nut needs to be tightened 'a little". The pinion is the problem here.

Title: Re: 9inch. whine noise after 8 miles of driving?
Post by: Gregwill16 on August 14, 2017, 06:27:45 PM

If its a factory 389 gear set they were known to be noisy, not sure about aftermarket.