Discuss Hot Rear Axle on standard 3.8L on AllFordMustangs.com, the place for Mustang enthusiasts.
Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.
You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.
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.
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.
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.