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14 bolt w/play?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by not4show, Jul 12, 2001.

  1. not4show

    not4show 1/2 ton status

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    This is really a reply to the post “thatk30guy repair estimate..... please read”, but I really did not want to reply under that post. So anyway, what I read was that many of you said that it is “normal” for a 14 bolt with a Detroit locker to have a lot of slack or play. I disagree with that. No axle should ever have a lot of slack or play in it, no matter how it is setup. My 14 bolt has a Detroit locker and it does not have any excessive play. So, how can having excessive play in a 14 bolt be justified by simply saying it has a locker?
     
  2. HarryH3

    HarryH3 1 ton status Author

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    All Detroit Lockers have about 8 degrees of "slop" between the drive and coast side of the locking teeth. Multiply this by the gear ratio to get the total pinion rotation that will occur before the ring gear moves. Let's say it's a 4.10 rear end: 4.10 * 8 = 32.8 degrees. [​IMG] Add in a little more to account for the gear backlash. It appears to be very sloppy as compared to a standard rear diff.

    <font color=black>HarryH3 - '75 K5</font color=black>
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  3. RGF

    RGF 1/2 ton status

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    If you dont believe Harry then you can check out Detroits website, you must have gotten the detroit and the Lincoln lockers mixed up!
    RGF
     
  4. HarryH3

    HarryH3 1 ton status Author

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    They don't go into detail but do mention an acceptable backlash of 30-90 degrees [​IMG] at <A target="_blank" HREF=http://www.tractech.com/TechTips.htm>http://www.tractech.com/TechTips.htm</A>

    <font color=black>HarryH3 - '75 K5</font color=black>
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  5. Twiz

    Twiz 1/2 ton status

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    Play in any rear end can not be correctly checked by the the "feel of the yoke". - I'm not kidding.

    Correct back lash can only be checked by measureing with a dial indicator. Removeing the bum cover and useing a dial indicator, set up 90 deg to the ring gear teeth and useing the ring gear and hodling the pinion stable- rock the ring gear back and forth. Proper back lash for a NEW ring and pinion gear set is 0.005 to 0.009 in. merasured at the ring gear (not the yoke!)

    Measuering "play" in a differential by the yoke is pure carp. You can get a "feel" for it. But to know forsure- it needs to be properly diagd. If measured at the yoke- not only does the back lash get checked, but the play in the spider gears to side gears, spider gear shaft to case, side gears to axle splines- etc, all of thet those parts adds to the total "play" felt at the yoke.... Any problem in a rear diff needs to be checked and measured. Not guessed at by "feel".

    Twiztid
     
  6. Pugsley

    Pugsley 1/2 ton status

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    Detroits have a little bit of play built in, otherwise the cogs would be locked up all the time. And a larger diff (like a 14 bolt, Dana 70, Eaton, etc) seems to have more backlash than a smaller unit would due to increased size of spider gears, ring/pinion, and other tolerances.

    <font color=red>What would Brian Boitano Do?</font color=red>
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