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Technical Chevy Drop Out Third Member Rebearing

Discussion in 'The Hokey Ass Message Board' started by blowby, Jul 16, 2021.

  1. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 13,698

    Johnny Gee
    Member
    from Downey, Ca

    ^^^^^ The little white tube should be the marking grease you asked about.
     
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  2. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    Got it. Weird stuff, like half paint, half grease. If I'm understanding correctly, I need to tighten the backlash. Thought I had it around .005 but I did have to loosen the left adjuster more than the stated one notch to get it.

    20210724_162104.jpg
     
  3. saltflats
    Joined: Aug 14, 2007
    Posts: 13,013

    saltflats
    Member
    from Missouri

    Scrape up the extra for future use.
     
  4. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    Lol, yeah, pretty tight with that stuff. I need the Costco tube. Will it dry overnight? I'm pooped.
     
  5. squirrel
    Joined: Sep 23, 2004
    Posts: 58,023

    squirrel
    ALLIANCE MEMBER

    no, it stays soft for a while. Like grease.
     
  6. jaracer
    Joined: Oct 4, 2008
    Posts: 2,780

    jaracer
    ALLIANCE MEMBER

    Titanium white from a art supply mixed with a little oil works pretty well.
     
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  7. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    I tried tightening the backlash, didn't help much, still inside. Removing the one old pinion shim would help I guess but it's only about .020, not going to do much I'm thinking. Other problem is I don't seem to be able to get a contact mark on the back side of the teeth, maybe I'm not rocking it hard enough? Need to get that before proceeding.

    I see why this is something normally left up to the pros.
     
  8. jaracer
    Joined: Oct 4, 2008
    Posts: 2,780

    jaracer
    ALLIANCE MEMBER

    You need to load the ring gear making it hard to turn. A pry bar between the case and the ring gear helps.
     
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  9. 427 sleeper
    Joined: Mar 8, 2017
    Posts: 3,227

    427 sleeper
    ALLIANCE MEMBER

    F.W.I.W... The pinion shims are "USUALLY" between .028 and .032 thousandths of an inch. Looks like you need more shim. Unless that's where the pattern is worn into old gear. Once the pattern is set, that's what you're stuck with.
     
    Last edited: Jul 25, 2021
    blowby likes this.
  10. banjeaux bob
    Joined: Aug 31, 2008
    Posts: 6,676

    banjeaux bob
    Member
    from alaska

    With the carrier bearing worn, the ring gear has been cruising backing and forth for awhile. You will never get a perfect pattern no matter what pinion shim you use. You will be lucky and not skillful if the unit does give you an acceptable pattern and does not make noise when you are done. Run the original pinion shim or one that is the closest thickness. adjust your backlash and see what you come up with. Keep in mind that the gears will be worn and your backlash may end up being more than you would like.
     
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  11. saltflats
    Joined: Aug 14, 2007
    Posts: 13,013

    saltflats
    Member
    from Missouri

    Don't change the pinion shim that is what it was set with. What is your pinion preload?
     
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  12. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    Well I did as jaracer suggested and now have a pattern on the other side of the teeth (hard to see in photo). High on ne side, low on the other. Need to check the charts, unless one of you knows what's next.

    I have the original pinion shim in there. There is no crush sleeve, I just tapped the outer bearing down until there was no play. Didn't want to use the crush sleeve until I checked the pattern first. Maybe that's part of the problem.

    This unit has screw in adjusters outboard of both carrier bearings so it's a simple matter to adjust the backlash. Book spec .005-.008.

    20210724_162110.jpg 20210727_104257.jpg
     
  13. banjeaux bob
    Joined: Aug 31, 2008
    Posts: 6,676

    banjeaux bob
    Member
    from alaska

    What kind of backlash? honestly you're not going to get much better with an used gearset after it has been run loose for awhile.
     
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  14. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    I have it about .005, played with it a bit and didn't see much change. This car sat from 1974 until a year ago when I got it. I'm guessing the bearings corroded (see post 30) during that time. I drove it maybe 10 miles before I pulled it. I can't say for sure when the wear occurred, a friend who road with me says he doesn't remember the noise at first. But I could visible wiggle the carrier in the bearings.

    In any case, it is what it is. I have time to play around a bit more but if it gets no better I'll try it as is. Stock 220hp, no race car. I have a spare in it now so rush. Good learning experience.

    Thanks for the help.
     
  15. Wanderlust
    Joined: Oct 27, 2019
    Posts: 909

    Wanderlust

    I save the old crush sleeve for set up.
     
  16. saltflats
    Joined: Aug 14, 2007
    Posts: 13,013

    saltflats
    Member
    from Missouri

    Have you tried .018 to .020 backlash?
     
  17. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    No, can you run that much? Chevy service manual says .005-.008
     
  18. saltflats
    Joined: Aug 14, 2007
    Posts: 13,013

    saltflats
    Member
    from Missouri

    I am sure it could of had that much wear in it.
     
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  19. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    Getting back on this a bit. I've got the pattern about as good as it's going to get with the used gears. What's the procedure for the crush sleeve and pinion nut install? I believe I need to end up with 10-14 inch pounds of torque, is that breakaway or rotational? But how do I get there and crush the sleeve?
     
  20. saltflats
    Joined: Aug 14, 2007
    Posts: 13,013

    saltflats
    Member
    from Missouri

    A big pipe wrench to hold the yoke and a long handle breaker bar.
    I go by turning resistance.
     
  21. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    How do you know when you're at 10 inch pounds? Just keep checking?
     
  22. Budget36
    Joined: Nov 29, 2014
    Posts: 14,735

    Budget36
    Member

    It’s rotational torque. The break over torque will be several in/lbs higher but as you rotate the pinion it’ll settle down

    I’ve a 3/8th drive beam in/lb TW that goes to 30 in/lb I use.

    I could flat rate it over to you and just send it back when done.
     
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  23. Once you get the end play out of the pinion and start to crush the crush sleeve, sneak up on it it’ll happen quickly. Tighten a little and measure rotational torque.
     
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  24. saltflats
    Joined: Aug 14, 2007
    Posts: 13,013

    saltflats
    Member
    from Missouri

    Once the free play closes up tighten and check every time. And take it slow with small increments'
     
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  25. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    How about I flat rate the pumpkin over, send it back when done. :)

    I also have a 3/8 beam but appreciate the offer.

    OK thanks guys, I think I get the picture. It'll be a few days until I can get back at it.
     
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  26. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    Finally some time to attack this today. Found a video on these babies, great instruction if not slow going. He's saying it takes 350 ft. lbs. to crush the sleeve, wow, but I can do that. And if you go too tight you need a new crush sleeve and start all over, yikes. He's saying 15-25 inch pounds rotational torque, I had read 10-14 on one of the rear end gear vender web sites. Hmm..

    ioj0.JPG
     

    Attached Files:

  27. squirrel
    Joined: Sep 23, 2004
    Posts: 58,023

    squirrel
    ALLIANCE MEMBER

  28. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    Thanks, good info there. Welp, it's back together. Once I got the bearings down to no slop it was torque a little, measure a little. Then I notice the first increment on my inch pound torque wrench is 25, ugh. And that's where I ended up, hopefully. Was a bit under and I gave it one more tug, just enough to move the nut. Feels tight, but I guess that's what 25 feels like turning the yoke by hand, and with a new dry seal.

    Carrier's back in, .oo7 backlash. Ready to plop it back in. Fingers crossed, not the easiest of things to tackle. Thanks again for all the help guys.

    20210816_092942.jpg
     
    Desoto291Hemi likes this.

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