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  1. M

    GL-4 Upgrade Spec

    Has API issued an upgraded GL-4 spec yet? They supposedly inactivated the existing GL-4 standard in 2010 on the basis of not having the proper test equipment, but were supposed to issue a new standard to service existing GL-4 needs. Has it happened yet- can't find much on the Net...
  2. M

    Worm Gear Winch

    I recently rebuilt the winch on my '49 Power Wagon, and would like to find a modern oil suitable for PTO-driven worm gear winch with a steel worm and bronze bull gear. The original lube spec was 90 wt gear oil, which was likely driven by availablity to the average user rather than suitability...
  3. M

    Gear oil for Diff using Phosphor Bronze washers

    Hi All; I'm rebuilding a differential for my '49 Power Wagon truck using Phosphor Bronze thrust washers in place of the original fiber ones (which disintegrate over time). Since GL-4 seems to be increasingly difficult to get, I'm wondering what a safe choice would be in today's diff oils- I'd...
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