1. pishta

    pishta I know I'm right....

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    I took a small flap wheel to the inside of that pinion bearing and now it barely slides on with no play. Great way to mock it up. My jig measures a .020 shim needed from the number on the end. Ill start with that.
     
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    • oldkimmer

      oldkimmer FABO Gold Member FABO Gold Member

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      Now I use a depth micrometer. As most of the newer diffs are more accurately cut. Kim
       
    • Jadaharabi

      Jadaharabi FABO Gold Member FABO Gold Member

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      Could you post a picture of one of the 2/3s that are not cut in the middle?
       
    • 68Dart500

      68Dart500 Well-Known Member

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      I'll be needing to do this soon once I get my 4.30 gears for my 489. Did my 3.55 489 case with crush sleeve eliminator and it whines so I obviously didn't get it set up right. Perfect excuse though to upgrade to 4.30 gears while I fix my previous mistake.
       
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      • pishta

        pishta I know I'm right....

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        How did you mess that up? Curious....did you get a good depth pattern? Did the lash change when you tightened everything up ?
         
      • 68Dart500

        68Dart500 Well-Known Member

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        Everything was within spec after tightening. I thought I had a good pattern according to the grease markings. It was a used gear set so maybe it was doomed before i even started
         
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        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          Sorry I don’t have 1 at this time. Kim
           
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          • replicaracer43

            replicaracer43 Old school member

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            I picked 1 random center section out of my collection, and did some measuring, to see if I was "full of crap" as one member stated. The carrier bearing bore measures at 3.268, so the dead center of that circle would be 1.634. Measuring the housing on the pinion side, from the machined flat surface measures 1.627, and the bearing cap measured from the machined flat measures 1.641. So clearly, the caps are NOT cut dead center of the bearing bore. THAT is why the factory, and every gear manufacturer recommends checking with the proper tool that measures from the CENTER of the bearing. Not some old pushrod. And why listening to poorly thought out shortcuts on the internet isnt always a good idea.

            20190514_102957.jpg

            20190514_103151.jpg
             
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            • replicaracer43

              replicaracer43 Old school member

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              And every housing varies, some are closer than others. And if you check the bearing bore with a dial bore gauge, you will find some are not as round as you think either!
               
            • Jadaharabi

              Jadaharabi FABO Gold Member FABO Gold Member

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              You get the .007 out of tolerance award. lmao
              There's a reason I have you on ignore.
               
            • oldkimmer

              oldkimmer FABO Gold Member FABO Gold Member

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              U r correct. I’ve had some that I needed a .060 thicker shim to get the pinion where I needed/wanted it. Used gears r tricky to get right. Kim
               
            • replicaracer43

              replicaracer43 Old school member

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              I dont care if you have me on ignore, I'm pointing out with FACTS that your wrong. And your half ass shortcut method could cause someone to screwup there gear set.
               
            • Jadaharabi

              Jadaharabi FABO Gold Member FABO Gold Member

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              Does not matter how or what you use to get there. In the end it is the pattern and backlash that counts.
               
            • fishy68

              fishy68 Tyr Fryr's Inc. FABO Gold Member

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              @Jadaharabi I too have measured carrier bearing bores and found them not to be cut exactly in the middle. I have one on the stand right now and will try to get a picture of taking measurements in the next couple days
               
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