I thought members my find this of interest. I had many a headache figuring this one out. My advice is to always use 75w-140 Syn Oil in the rear. I also use it in the front.
Rear Axle - Carrier Bearing Growl
GROUP: Axle And Propshafts
DATE: Jul. 31, 1998
Rear Axle Carrier
NOTE :THIS BULLETIN APPLIES TO 1997 AND 1998 GRAND CHEROKEES EQUIPPED WITH V8 ENGINES AND ALUMINUM HOUSING DANA 216 RBA AXLES BUILT IN THE USA (ZJ) BETWEEN DECEMBER 1, 1996 AND MARCH 31, 1998 (1997 MDH 1201XX THROUGH 1998 MDH 0331 XX) AND BUILT IN EUROPE (ZG) BETWEEN JANUARY 20, 1997 AND JUNE 30, 1998 (1997 MDH 0120XX AND 1998 MDH 0630XX).
1997 through 1998 (ZJ) Grand Cherokee
1997 through 1998 (ZG) Grand Cherokee (International markets)
A growling noise may be present coming from the rear axle. This noise may be caused by gradual wearing of the rear axle carrier bearings and races. The noise is usually light at first and is often mis-diagnosed for a wind noise or air leak in the tailgate area. The noise becomes gradually worse with increased mileage. A remanufactured axle assembly has been released for use in this situation.
The axle assemblies will be shipped minus axle shafts and wheel end/brake components which will require transfer from the original assembly. The axle assemblies will be shipped dry as they will require cover removal for installation of the axle shaft C clip retainer.
CAUTION :THE AXLE BEARINGS RIDE DIRECTLY ON THE AXLE SHAFT WITHOUT A RACE IN THIS APPLICATION. DAMAGE TO THE AXLE SHAFT CAN RESULT FROM CONTAMINATION IF METAL PARTICLES ARE PRESENT IN THE FLUID. CAREFULLY INSPECT THE AXLE SHAFT FOR DAMAGE AT THIS AREA. IF ANY DAMAGE IS PRESENT, AXLE SHAFT REPLACEMENT WILL BE REQUIRED.
Road test the vehicle. If the noise is present and the vehicle falls within the build range perform the Repair Procedure.
AR R4886322 Axle Assy. 5.2L - 3.73 ratio, without Trac Loc (Tagged
5207044 or 52098980)
AR R4886321 Axle Assy. 5.2L - 3.73 ratio, with Trac Loc (Tagged
52070046 or 52098981
AR R5003337 Axle Assy. 5.9L - 3.73 ratio, with Trac Loc (Tagged
Bolts - Diff. Cover 41 Nm (30 ft. lbs.)
Screws ABS sensor 17.6 Nm (13 ft lbs.)
Nuts - Backing Plate 61 Nm (45 ft. lbs.)
Brake Caliper 15 Nm (10 ft. lbs.)
Propeller Shaft Yoke bolts 19 Nm (14 ft. lbs.)
Shock Absorber nut 92 Nm (68 ft. lbs.)
Upper Control Arm nuts 75 Nm (52 ft. lbs.)
Lower Control Arm nuts 177 Nm (130 ft. lbs.)
Sway Bar nut 36 Nm (27 ft. lbs.)
Track Bar bolt 100 Nm (74 ft. lbs.)
POLICY: Reimbursable within the provisions of the warranty.
Axle assembly, Remanufactured - Replace - 216 RBA axle
Labor Operation No: 03-30-01-92 2.2 Hrs.
FAILURE CODE: P8 - New Part