Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Front Reduction Driven Gear: Adjustment
- If the ball bearing is attached, remove the bearing and shims. < Ref. to REMOVALΒ , Converter Case Cover. >
- Using the ST, measure height "A" from the ST upper face to the mating surface of the case.
ST 398643600 GAUGE
- Measure depth "B" from the converter case cover upper face to the bearing catch surface.
- Install the ball bearing to the reduction driven gear.NOTE: Use a new ball bearing.
- Measure depth "C" from the ST upper face to the bearing end face using the ST.
ST 398643600 GAUGE
- Calculate clearance "T" using the following formula.
Formula: T mm = (C - 15) - ((A - 15) - B)
[T in = (C - 0.591) - ((A - 0.591) - B)]
T: Clearance
A: Height from the ST upper face to the converter case mating surface
B: Depth from the converter case cover upper face to the bearing catch surface
C: Depth from the ST upper face to the bearing end face
15 mm (0.591 in): Thickness of ST
Clearance "T" mm (in) Thickness of shim mm (in) 0.470 - 0.569 (0.019 - 0.021) 0.4 (0.016) 0.570 - 0.669 (0.022 - 0.025) 0.5 (0.020) 0.670 - 0.769 (0.026 - 0.029) 0.6 (0.024) 0.770 - 0.869 (0.030 - 0.033) 0.7 (0.028) 0.870 - 0.980 (0.034 - 0.039) 0.8 (0.031) - Select one to two shims so that the total thickness meets the value obtained from above.
Part No. Thickness of shim mm (in) 31288AA130 0.2 (0.008) 31288AA140 0.3 (0.012) 31288AA150 0.5 (0.020)
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.