Rear axle noises heard on drive will usually be heard also on coasting, although not as loud.

Adjust or replace the differential drive pinion gear and the ring gear set.

Spicer Eaton call 1-800-TCM-HELP

Meritor 1-800-535-5560

Differential drive pinion gear and ring gear too tight (audible when slowing down and disappears when driving).

Adjust the differential drive pinion gear to the ring gear backlash.

Spicer Eaton call 1-800-TCM-HELP

Meritor 1-800-535-5560