Specifying FAQ
  • F.A.Q: AD

    Truck

    1. Q: Where can I find the Speedo pinion adapters for older “D” trucks with Diesel motor?
    1. Q: Where can I find the Speedo pinion adapters for older “D” trucks with Diesel motor? - Top

    A: They can be difficult to find and difficult to determine, here is a chart:

    For 2WD:
    4428480 for .625 to 1 ratio
    4428483 for .667 to 1 ratio
    53009220 for .533 to 1 ratio

    For 4WD:
    4167564 for adapt stamped 1.0263 to 1 ratio
    1797170 for 1.0400 to 1 ratio
    4348801 for 1.1590 to 1 ratio
    4428548 for 1.3313 to 1 ratio
    4428549 for 1.3846 to 1 ratio
    4428962 for 1.400 to 1 ratio - Updated: May 10, 2002

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