A/T - Thrust Plate Selection Procedure
BULLETIN: # 081DATE: November 1991
SUBJECT: Thrust Plate Selection
APPLICATION: Chrysler
Thrust Plate Selection Procedure:
Proper thrust plate selection is very important to prevent 3-4 bind-up, slipping in reverse, and no "engine braking".
Use this method to choose the proper thrust plate thickness.
Step 1: Assemble entire overdrive section.
Step 2: Support extension housing upright in a vise or holding fixture.
Step 3: Lay a straight-edge across the extension housing gasket surface.
Step 4: Using a depth micrometer or a vernier caliper, measure the distance to the sliding hub bearing seat, WITH THE BEARING REMOVED. Figure 1.
Step 5: Measure in 4 places, 90 degrees apart.
Step 6: Add all 4 measurements together, then divide this number by 4. This is the AVERAGE MEASUREMENT.
Step 7: Measure the thickness of the straight-edge, and subtract this amount from the AVERAGE MEASUREMENT.
Step 8: Refer to the chart for selection. Figure 2.
EXAMPLE ONLY
Measurement
1 1.491
2 1.488
3 1.492
4 1.489
------
TOTAL 5.960
DIVIDE by 4
= 1.490----> (AVERAGE MEASUREMENT)
SUBTRACT .158-----> (STRAIGHT-EDGE THICKNESS)
1.332-----> Compare this number to the chart.
In this example our thrust plate selection Would be part # 4431587, which is .183 - .185 thick.