Rear Diff Noise

[byron628]

i have a 2000 gmc 4x4 sierra.my rear diff is like its in posi track all the time. its ok if your going straight,but as soon as you turn it makes noise.what is the problem?

[Z45]

How are your tires? Worn out tires will cause slip and the locker may engage.

 

Change lubricant. DO NOT use any additives with the lube.

 

SUBJECT: LOCKING DIFFERENTIAL (G80) LUBRICANT - (SERVICE INFORMATION)

VEHICLES AFFECTED: ALL LIGHT TRUCKS EQUIPPED WITH G80 REAR AXLE ALL YEARS

Some light duty trucks equipped with locking rear axles (G80) may exhibit rear axle chatter, especially when turning a corner from a stop.

This condition of alternate engagement and disengagement of clutches in differential assembly is usually caused by contaminated axle lubricant.

To correct this condition, drain and refill the rear axle. The use of any additive in locking rear axles (G80) is not recommended. Rear axle additives are designed for use in limited slip differentials which are normally installed in cars. All light duty trucks equipped with RPO G80 make use of a locking differential and the use of additives will delay the engagement of the locking mechanism and may decrease axle life.