Pinion bad?
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Pinion bad?

  1. #1
    Senior Member wagspe208's Avatar
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    Default Pinion bad?

    OK, it is not engine stuff, but you guys know....
    Is this pinion dead, bad, or acceptable? It is in my high lift, so it turns maybe 500 rpm's?
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  3. #2
    Senior Member EVILFORCE's Avatar
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    Might be my monitor but it looks bad to me and was running set up wrong as well. Where is the wear pattern on the other dear?

  4. #3
    gn7
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    Quote Originally Posted by wagspe208 View Post
    OK, it is not engine stuff, but you guys know....
    Is this pinion dead, bad, or acceptable? It is in my high lift, so it turns maybe 500 rpm's?
    Not sure if it was set up wrong, but the wear is off to the retainer side big time. It could simply be inherent to design, too much power for the design, or a bearing that is worn and allowing it to miss align. But you can see the taper in the teeth front to back, and the case hardening is worn through at the front of the teeth.
    It will still move the vehicle, but its going to fail at some point. I don't think it has as many hours left in it then it has already run. Its on the down hill side of its life for sure.



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    Senior Member rpm0414's Avatar
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    Too cheap of a part to run it. It's a bad race or bearing. It's out so replace it

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    gn7
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    Quote Originally Posted by rpm0414 View Post
    Too cheap of a part to run it. It's a bad race or bearing. It's out so replace it
    I tend to agree. Murphy says that will fail at the worse possible time too.
    I Agree RPM414, I am thinking the bearing allowed it to misalign and cause the wear. But with enough torque, that can happen to a design that is not up to the applied power.

    Thats why the VERY best removable pumpkin, removable pinion type rearend EVER built has a pinion support on the backside of the pinion. THE 9" FORD!!!!!!



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    Senior Member rpm0414's Avatar
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    Yes the 9" has the best pinion support. I always hate when I see a guy bring in a 12 bolt or Dana style gear change. 9" takes maybe 2 hours and done. Best rearend ever. Top loader good design just eats power.

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    Senior Member wagspe208's Avatar
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    It is a funky setup. The tapered roller bearings that supoort it in the housing are not adjustasble for preload. They are purchased as a set, with spacer and preload spec is .001 to .007 end play actually. Mine was loose. It had .020 ish end play. This allowed for the pinion to move up and down somewhat. Issue 2 was... there is a slot in the bearing holder for the ring gear assembly. The pin, in the bearing cap, that is supposed to be in the slow was not in the slot, so poor setup. So, there we go.
    This pic sort of gives you an idea of what is going on.
    The backlash spec is .008 +- .003 I think. I had .020 (measured at the pinion). So, the pinion was wondering around somewhat.
    A "good" used one is 275. Bearings are 130 for the set. I'd sure hate to have to rip this thing apart again. Actually it is not to bad. Just heavy.
    Wags
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