Fix: Pinion bearings spin faster than carrier bearings or axleshaft bearings, so this noise is typically easy to decipher. Custom Differentials says it’s not the highest-pitch whine from an axle ...

With so many choices now on rear axles for vintage Fords, Mustang and Fords Magazine has compiled this Ford Differential Builder's Guide to help you choose the best setup.

The pinion bearings and the differential's carrier bearings must run a little tight. This is similar to the way a wheel bearing should be loaded during assembly.

If the differential carrier bearings are not the root cause of this issue, the bulletin says that the axle shafts should be pulled and inspected.

General Motors has released a new service bulletin for the 2023 Chevy Colorado to address a moaning or howling noise heard around the rear end of the pickup.