Differential Thrust Washer Selection

Fig 1: Identifying Differential Thrust Washer Selection

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
CAUTION: Improper thrust washer selection can cause insufficient taper bearing preload which will cause premature failure of the front differential drive pinion gear.
1	Front Differential Bearing Washer Procedure Place DT47800-7 in the gap in DT47800-2 which are both part of DT-47800 selection gauge kit, to determine the proper thrust washer. Choose the correct thrust washer. Refer to Taper Bearing Preload Selective Specifications . NOTE: Continue trying different sizes of DT47800-7 which is part of DT-47800 selection gauge kit, until the gauge will no longer fit into the gap. The correct thrust washer size is equal to the largest blade gauge that fits into the gap. Match the size of the correct DT47800-7 blade which is part of DT-47800 selection gauge kit, to the color code in the thrust washer specification chart. The washer color coding is on the outside diameter of the washer. The gap in DT47800-2 which are both part of DT-47800 selection gauge kit may not be even. Hold the top of the gauge and rotate the bottom of the gauge to even out the gap. Take two gap measurements 180 degrees apart. Average the two measurements and select the thrust washer that is closest to the average. The washer color coding is on the outside diameter of the washer. Special Tools DT-47800 Thrust Washer Selection Gauge Kit For equivalent regional tools, refer to Special Tools .
2	Front Differential Drive Pinion Gear Bearing Thrust Washer Procedure Place DT47800-7 in the gap in DT47800-1 which are both part of DT-47800 selection gauge kit, to determine the proper thrust washer. Choose the correct thrust washer. Refer to Taper Bearing Preload Selective Specifications . NOTE: Continue trying different sizes of DT47800-7 which is part of DT-47800 selection gauge kit, until the gauge will no longer fit into the gap. The correct thrust washer size is equal to the largest gauge that fits into the gauge. Match the size of the correct DT47800-7 blade which is part of DT-47800 selection gauge kit to the color code in the thrust washer selection chart. The gap in DT47800-1 which is part of DT-47800 selection gauge kit may not be even. Hold the top of the gauge and rotate the bottom of the gauge to even out the gap. Take two gap measurements 180 degrees apart. Average the two measurements and select the thrust washer that is closest to the average. The washer color coding is on the outside diameter of the washer. Special Tools DT-47800 Thrust Washer Selection Gauge Kit For equivalent regional tools, refer to Special Tools .
3	Torque Converter and Support and A/Trans Fluid Pump Housing Assembly Procedure Remove DT47800-3 which are both part of DT-47800 selection gauge kit, bolts and spacers. Remove the torque converter housing. Remove DT47800-1 and DT47800-2 which are both part of DT-47800 selection gauge kit. Remove the torque converter housing seal. Remove the pinion gear and differential bearing cups. Install the bearing cups and thrust washers into the torque converter housing per the replacement procedures. Refer to Front Differential Carrier Bearing Cup and Washer Replacement - Torque Converter Housing Side , and Front Differential Drive Pinion Bearing Cup, Washer, and Lubricant Dam Replacement - Torque Converter Housing Side . NOTE: DT47800-1 and DT47800-2 which are both part of DT-47800 selection gauge kit, may stick in the torque converter housing. Be careful not to drop the gauges. Special Tools DT-47800 Thrust Washer Selection Gauge Kit For equivalent regional tools, refer to Special Tools .