Pinion bearing

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Oct 22, 2009 | 07:11 PM

DrDaddyDude

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From: Louisville & Illinois

Pinion bearing

Hey folks, any suggestions are welcome. Have an '01 Exp with a 3.55 Trac-Lok, 192,000 miles. A whine in the pinion bearing started 500 miles ago, it increases/decreases with acceleration/deacceleration, is steady and makes no other noise (clunking, chatter). I changed the gear oil (75-140 with friction add) but no relief. Short of replacing the bearing, would 80-90 gear oil help? Also, any mileage estimates before failure? Thanks.

Oct 22, 2009 | 11:16 PM

alloro

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Read this thread, but pay attention to the first paragraph of post #8. His pinion nut was loose before he even touched it. This might be the case with you as well. If your's is loose you might be able to simply torque it down to the 160 ft. lbs. and the noise could go away.
https://www.ford-trucks.com/forums/8...-pitfalls.html

Oct 22, 2009 | 11:25 PM

DrDaddyDude

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Thanks for the reply and the reference to the other post...good info. Appreciate your knowledge.

Nov 3, 2009 | 12:22 PM

DrDaddyDude

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Quote:

Originally Posted by alloro

Thanks, the pinion nut was overtightened so we backed it off and reset at 160 ft/lbs. Whine was reduced by half or more but is still there.

Nov 3, 2009 | 07:29 PM

Big Greenie

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I would have to guess that all of the bearings in that rear end are worn and loose. Short of a full rebuild, you probably can not eliminate the noise. The pitfall of waiting to do it, assuming you plan to keep the truck for a while, is that when you finally are forced to do it because of a failure, you may have ruined the gearset as well.

It could definately last quite a bit longer as is. The one in my work truck has a little whine and 255,000 miles on it.

Nov 3, 2009 | 07:54 PM

DrDaddyDude

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Thanks Big Greenie...I plan on keeping it for quite a while and will have work done soon. It's been whining for about 900 miles so the sooner the better.