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TSB 03-02-00

9.25 axle gear marking compound causing a milky-like appearance in axle fluid

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Date: Mar. 03, 2000

Models: 1999-2000 BR/BE Ram

1999 - 2000 (AB) Ram Van
1999 - 2000 (AN) Dakota
1999 - 2000 (BR/BE) Ram Truck
1999 - 2000 (DN) Durango

NOTE: ONLY APPLIES TO 9.25 AXLE AND VEHICLES BUILT BETWEEN 11/1/98 AND 11/1/99

Discussion:
The customer or servicing technician may notice a milky-like appearance to the 9.25 inch rear axle fluid. This condition may be brought to the customer's attention when the axle fluid is inspected during normal service. Other than the concern for the color of axle fluid, the customer does not experience any other axle complaint. The customer or servicing technician may be concerned because a milky-like appearance to the axle fluid may also indicate the presence of water.

The cause of the milky-like appearance to the axle fluid may be due to the use of a white color gear marking compound during the axle assembly process. Axle gear marking compound is used to verify correct ring and pinion gear alignment during manufacture. The 9.25 inch rear axle is assembled on two different assembly lines. To visually distinguish axles from each assembly line, one assembly line used a white color gear marking compound (versus yellow). Half of the axles that were assembled during the above time frame may have the white gear marking compound mixed with the rear axle fluid. The white color gear marking compound is no longer in use by the axle assembly plant.

NOTE: IF THE MILKY-LIKE REAR AXLE FLUID APPEARANCE IS DUE TO THE WHITE GEAR MARKING COMPOUND, THEN NO SERVICE ACTION IS NECESSARY TO ADDRESS THIS CONDITION.

If the milky-like rear axle fluid appearance is due to the presence of water, then the rear axle will require service. Axle fluid, contaminated with water, may cause rust and damage to the internal components of the axle.

Any water in the axle fluid will begin to boil off (reach its gaseous state) before the oil. Placing a small sample of axle fluid on a hot steel surface (around 100C or 212F) will cause any water that may be present in the fluid to boil off with a "sizzle-like" sound.

Notes:

POLICY.   Information Only


Thanks to Bob Bergevin for supplying this TSB information

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This page was edited on: May 3, 2004