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Differential Upgrades

Discussion in 'Early CJ5 and CJ6 Tech' started by Mr Vaughan, Nov 28, 2020.

Page 2 of 2
  1. Dec 5, 2020
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    Didn’t say it was or is easy. Just said it could help.
     
    nickmil, Dec 5, 2020
    #21
    Norcal69 likes this.
  2. Dec 5, 2020
    Keys5a

    Keys5a Sponsor

    Florida Keys
    Joined:
    Jan 23, 2014
    Messages:
    4,192
    I'm just bringing up a question. Has anyone tried a "G-Locker" automatic locker up front in a D30? They are found in the D30 rear diff of some Volvo wagons from the late '80s. The G-Locker senses different rotation rates of left/right axle shafts and locks them when needed. There is a flyweight on the case that disengages the locking function over about 25 mph. I picked one up at a U-pull yard that had 3.73 gears, but I haven't tried installing it since I found a D30 PowrLok.
    I think the G-Lockers were also used on full size Chevy/GMC pickups about 10 years back.
    -Donny
     
    Keys5a, Dec 5, 2020
    #22
  3. Dec 5, 2020
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    The G series used in GM's, also referred to as Gov-Locks are known for failing catastrophically. Couldn't pay me to put one in anything I own. Not sure how one would fare in a Dana 30 but if they don't hold up in a GM Corporate 14 bolt Full Float axle...
     
    nickmil, Dec 5, 2020
    #23
  4. Dec 5, 2020
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
    Joined:
    Dec 17, 2002
    Messages:
    2,362
    I have a G-80 locker in my 2016 Colorado. When locking in it has a good clunk from the axle. I don't think it's very strong and wouldn't recommend installing one.
     
    scott milliner, Dec 5, 2020
    #24
  5. Dec 5, 2020
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
    Joined:
    Jul 18, 2013
    Messages:
    5,671
    From my limited experience working with a chevy G locker on a friend's full-size truck, I'd look into how much differential wheel spin is needed before it locks in....I am not sure which G-locker version he has, and certainly its in a very different application, but his seems to need quite a lot of differential wheel spin before it locks in, and thus it requires some throttle. Granted he has a full size truck on 37s, but when he revs it and gets the wheel spin needed to lock in, it seems pretty violent and harsh, not to mention a bit difficult to manage in more technical, slow speed crawling type terrain....Now in open sand/mud etc, it seems like it'd be pretty darn fun....
     
    FinoCJ, Dec 5, 2020
    #25
  6. Dec 5, 2020
    Bigdaddy13

    Bigdaddy13 Member

    So.Cal
    Joined:
    Nov 19, 2019
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    556
    I've been a stalwart fan of locked front and rear, but with this CJ5, to avoid stressing out the front drivetrain (until I find a NT D30), I think my plan is Detroit soft-locker rear (19-spline) and possibly a PowerLoc front, set to be fairly tight, since I plan on staying with manual steering. Just trying to decide on rear axle options at the moment.

    I'm doing my best to keep this rig an "analog", tough-as-nails 60's crawler, with minimal modern stuff. Even my 4.3l engine might end up with a carb - it still has provisions for a manual fuel pump in the block. :shock:
     
    Bigdaddy13, Dec 5, 2020
    #26
  7. Dec 5, 2020
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
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    12,529
    Does it have the pushrod hole machined? I had one (fuel injected) that had the cast in recess with a block off plate and mounting bolt holes machined and threaded but the pushrod hole was never machined in. A good thing to double check.
     
    nickmil, Dec 5, 2020
    #27
  8. Dec 5, 2020
    Bigdaddy13

    Bigdaddy13 Member

    So.Cal
    Joined:
    Nov 19, 2019
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    556
    Yessir it does.
     
    Bigdaddy13, Dec 5, 2020
    #28
  9. Dec 6, 2020
    Downs

    Downs Rattlecan All The Things!

    Hunt County Texas
    Joined:
    Jul 25, 2020
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    578
    Been a Junkyard swap for XJs quite a while. Not sure how common they are. We have a total lack of pick and pull style yards around here.









     
    Downs, Dec 6, 2020
    #29
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