Best used rear axle: how to choose?

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If you want to choose the best used rear axle, there are several areas you should look into. The condition of the lubricating oil in the center section is the best indicator to identify the best used rear axle for any application. The bearings should also be examined to ensure that you have chosen the best used rear axle. If you choose complete assembly, you must identify the proper axle housing required for your specific vehicle; if you choose just the axle, you’ll want to make sure the bolt pattern is the same as the axle to be replaced. You may also want to examine the splines on the shaft to make sure they have the proper count for your center section.

Axle housings can say a lot about the axle that is inside. Any sign of accidental damage, such as evidence of fire or a visible curve, will mean that you should avoid that particular shaft. You can often determine the bearing size of an axle by examining the axle housing, specifically, the axle tube ends. If possible, remove the center section or rear axle cover to inspect the condition of the gear assembly and carrier.

When trying to insure one axle only, it is always best to purchase a used rear axle that is installed in a complete axle assembly. Buying an axle that is sitting in a used axle pile or on a shelf can often lead to the purchase of a sub-standard used rear axle. When you find a complete axle housing, you can rotate the axle and check that it is in working condition with no burned bearings or damaged splines.

If you want to buy the best used rear axle possible, never buy an axle that has signs of damage to the axle flange or spline area. It’s also best if the “new” used axle is complete with bearings and where applicable C-clips in place. When purchasing a C-clip style axle, be sure to examine both the end of the axle and the C-clips for signs of damage such as overheating, scuffing, and rubbing. This can often indicate a worn or damaged bearing surface in the used rear axle.

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