R 3500 P/U 2WD V8-454 7.4L VIN W 4-bbl (1988)
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Speedometer Gear, A/T: Service and Repair
1.
Disconnect speedometer cable.
2.
Remove retainer bolt, retainer, speedometer driven gear, and O-ring seal.
3.
Reverse procedure to install, using new O-ring and adjusting fluid level.