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Unread 12-31-2013   #1 (permalink)
3dagokids is offline Rookie


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Smile Hot Rear Axle on standard 3.8L

I just had the pinion bearings and the rear axle bearings replaced by a professional shop on my rear axle last week. I inspected the new bearings and the pinion gear and it looked to be in good shape.

I am still having a howling noise coming from rear end. Further more, today I tested the temperature of the differential compared to the axle housing and rear brakes. The temperature difference was 70 deg hotter at the pinion area than the housing and the brake drums. The temperature was in excess of 170F compared to 100F. Ambient air temperature is 45 deg F. BTW, the manual transmission housing was around 100 deg F.

Is there a break-in period? What should be my next steps to solve this problem...I assume I have one.
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Unread 12-31-2013   #2 (permalink)
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I'd take it back, something is not right when it is howling after only a bearing change, they prob skimped out on checking the backlash or re-shimming anything, just slapped in new bearings probably.
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Unread 12-31-2013   #3 (permalink)
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If you have noise from the rear end then you still have something wrong. Must have been something besides the bearings. The pinion bearing preload for new bearings should be around 20 inch pounds. If the person who replaced them just put it together with an impact wrench and didn't actually set the preload then that could be the problem.
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Unread 12-31-2013   #4 (permalink)
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Thanks for the feedback...The mechanic didn't speak about a pre-load on the pinion gear. My concern now is that these mechanic(s) aren't familiar with Mustang rear ends.

I will stop at the shop tomorrow and speak with the Manager. Yes, they are open on New Years Day.....I will bring them lunch....

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Unread 01-05-2014   #5 (permalink)
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Found out that the mechanic did not set pre-load on pinion gear assembly to specifications....20 in-lbs. With help of supervisor and new bearings, all good now. Axle differential is now about the same temperature as transmission.
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Unread 01-05-2014   #6 (permalink)
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Glad to hear it.
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