Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

setting 14bff backlash?

Discussion in 'The Garage' started by pismorat, Jul 5, 2006.

  1. pismorat

    pismorat 1/2 ton status

    Joined:
    Oct 29, 2002
    Posts:
    540
    Likes Received:
    2
    Location:
    California
    I just got my DIY4X diff cover and am about to put it on; I pulled the old one off and saw some metal in the bottom of the diff. The gears look worn, but not horribly. I put a locker in it a few years back and set the backlash, but now I forgot how to check it and adjust it. Can anyone give me a run-down of what I need to do to check/adjust it?
     
  2. readymix

    readymix 3/4 ton status

    Joined:
    May 30, 2004
    Posts:
    6,706
    Likes Received:
    26
    Location:
    Murrieta, California
    get a mag base and dial indicator to check the BL.
    Adjust if needed buy turning the spanners on hte sides of the carrier......loosen the caps first.
     
  3. pismorat

    pismorat 1/2 ton status

    Joined:
    Oct 29, 2002
    Posts:
    540
    Likes Received:
    2
    Location:
    California
    What should the spec be? I put this axle in a 1/2 ton.
     
  4. johnathan

    johnathan 1/2 ton status

    Joined:
    Sep 26, 2005
    Posts:
    376
    Likes Received:
    0
    Location:
    Ocean Springs,MS
    .005-.008 is ideal
     
  5. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

    Joined:
    Jan 27, 2003
    Posts:
    3,254
    Likes Received:
    0
    Location:
    Castro Valley, CA
    When setting up new gears, older gears the backlash will be more becuase it is going to open up.
     
  6. sandawgk5

    sandawgk5 3/4 ton status

    Joined:
    Oct 28, 2003
    Posts:
    6,881
    Likes Received:
    1
    Location:
    Kitsap County PACNORWEST
    I set my used set .008-.012 and it has worked so far and when I painted them it came out right I run right around .009.

    I also have a detroit and at the wheel it acts like it has a lot of backlash in it but the gears are pretty tight.

    Ira
     
  7. shane74

    shane74 1/2 ton status

    Joined:
    Feb 12, 2002
    Posts:
    4,100
    Likes Received:
    0
    Location:
    Vancouver, WA
    .006 is the magic number for setting up new gears. They can be up to .010 and be ok.
     
  8. NEK5

    NEK5 3/4 ton status Premium Member

    Joined:
    Oct 25, 2005
    Posts:
    9,843
    Likes Received:
    37
    Location:
    Ipswich MA
    Bringing back an old thread. Is .012 too much for backlash in the 14BFF?
     
  9. 58 apache

    58 apache 1/2 ton status

    Joined:
    Aug 26, 2006
    Posts:
    377
    Likes Received:
    0
    Location:
    clarksville,Va home of the body bag
    TM 9-2320-289-34​




    6-15. REAR AXLE DIFFERENTIAL MAINTENANCE (ALL EXCEPT M1009) (Con’t).​




    NOTE​


    At this point, side bearings are preloaded. If any additional adjustments
    are required, ensure that preload remains as established. If 1 adjusting nut
    (8) is loosened, the other must be tightened an equal amount to maintain
    this preload.
    8. Mount dial indicator (22) on housing
    and measure backlash between ring
    gear (4) and drive pinion gear. Rock
    ring gear back and forth to measure
    backlash. Backlash should be
    between 0.003-0.012 in. (0.076-
    0.305 mm) with
    0.005-0.008 in.
    preferred,
    (0.1 27-0.203 mm)
    NOTE
    If adjusting nut
    (8) requires
    adjustment, bolts (2 and 5) must
    be loosened. Once final
    adjustments have been made,
    bolts must be retightened to
    proper torque.
    9 . If backlash is more than 0.012 in.
    (0.305 mm), loosen right adjusting
    nut (8) 1 slot and tighten left adjusting
    nut 1 slot. If backlash is less than
    0.003 in. (0.076 mm), loosen left
    adjusting nut 1 slot and tighten right
    adjusting nut 1 slot. Remove dial
    indicator (22) from housing.
    NOTE
    If ring gear (4) and drive pinion were replaced, perform steps 10-13 to
    check for proper gear tooth contact pattern.
    10. Wipe any lubricant from housing and clean each tooth of ring gear (4).
    11. Using a medium stiff brush, sparingly apply prussian blue dye to all ring gear (4) teeth. Area of
    drive pinion tooth contact should be visible when drive pinion is engaged by hand.
    NOTE
    Excessive turning of ring gear (4) is not recommended. Ring gear should
    be turned only enough to provide tooth contact pattern,
    12. Apply load until it takes a torque of 40-50Ib.-ft, (54-68 N.m) to turn drive pinion.turn
    companion flange so that ring gear (4) turns
    1 full revolution, then reverse so that ring gear turns 1 rev in opposite direction​



    1 3 . Contact pattern should be centrally located up and down on the face of the ring gear (4) teeth.​


    Compare tooth contact pattern on ring gear with examples shown and make adjustments as
    indicated.
    NOTE
    Ensure that differential cover and magnet are clean.
    14. Carefully position vent tube bracket, brake line and bracket, and proportioning valve lever at
    housing. DO NOT kink lines. Install new differential cover gasket and differential cover with 14
    bolts. Tighten bolts to 35 Ib.-ft. (47 N.m).
    FOLLOW-ON TASKS:​


    • ​


    Install rear axle shafts. (See TM 9-2320-289-20) Fill rear axle differential with lubricating oil. (See LO 9-2320-289-12)


    TA50589​


    6-103​


     
  10. rbflip

    rbflip Newbie

    Joined:
    Nov 30, 2006
    Posts:
    1
    Likes Received:
    0
    Location:
    DFW
  11. readymix

    readymix 3/4 ton status

    Joined:
    May 30, 2004
    Posts:
    6,706
    Likes Received:
    26
    Location:
    Murrieta, California
    If the gears are used that might be an OK number, however if they are new you should try to get the BL a little lower to have the strongest set-up.
     

Share This Page