SD60 Gear Pattern Check

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    SD60 Gear Pattern Check

    What would the new forum be without a gear pattern check thread!

    Specs
    2006 F250 D60 Spicer 5.38 10" gears installed on a yukon grizzly locker

    Pinion set with 0.034 shim under the inner pinion bearing race backlash is at 0.007 and the case preload just so that takes a wack or two to get the case in. Pinion preload not set and this is using setup bearings.

    Let me know what you guys think.
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    Last edited by MtnYota; 05-25-2020, 04:37 PM.

    #2
    So I found out that the Spicer gears are face hobbed or "2 cut" gears and that they end up with a different pattern. That is why the drive size pattern appears angled. But I can't seem to find any 2 cut backlash specs for the D60.

    I found this page that talks about how the pinion depth and backlash move the pattern around on the 2cut 8.8 gears.:
    https://www.diyford.com/ford-axle-ri...ssembly-guide/
    Last edited by MtnYota; 05-25-2020, 09:51 PM.

    Comment


      #3
      Hard to say. The top tooth of the first pic (coast side) seems to be heavily slanted towards a triangle, rather than typical parallelogram that the 2 cut favors.

      Drive side seems to straddle between triangle/parallelogram to my eye. What happens if you over-under size the shim (shape wise) ?

      Comment


        #4
        These are @ 0.044 pinion shim and 0.006 backlash. This attempt was before I realised they were 2 cut gears. Apparently they like more backlash, but I can't find any specs still.


        I kept going shallower with the pinion thinking the hard line on the coast side meant I was too deep like with 5 cut gears, but now I am wondering if the 2cut's show a more defined line and that is a shallow pattern on the coast side. I'll make a couple more attempts tomorrow.


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          #5
          I recall the 2 cut preferring LESS, not more.

          But I've been wrong from time-to-time.

          Comment


            #6
            https://www.differentials.com/two-cu...ive-cut-gears/

            Comment


              #7
              Here is 0.042 and 0.012" BL
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              Here is 0.050 and 0.008BL
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              I think I need to pull the pinion back out a little and tighten the BL a little. Below is what I am basing the corrections on. It seems a little different the adjusting the 5cut gears.

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              Comment


                #8
                Here is 0.046 pinion shim and 0.006BL
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                Here is 0.044 at 0.008BL

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                I'm thinking about running with this last one and trying to tighten the BL up to 0.006 what says the great PBB... or IBB?

                Comment


                  #9
                  I like the last one the best. .046 at .006 bl. You are much more down at the root of the gear where the strentgh is.

                  Comment


                    #10
                    It's good. Run it.

                    Comment


                      #11
                      I'm in agreement. Last pattern looks the best (esp coast side)

                      Comment


                        #12
                        Thank you guys! Time to button it up.

                        Comment

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