re-gearing to 4.10

Discussion in 'KJ General Discussion' started by arielflash, Oct 1, 2018.

  1. arielflash

    arielflash New Member

    Messages:
    22
    Likes Received:
    0
    Joined:
    Apr 1, 2018
    Location:
    Israel
    Hi all,
    I am looking into re-gearing to 4.10 after moving to 247/75/16 wheels...
    I know there are many threads talking about this but all of them are a couple of years old and I want to make sure I am in the right direction and not much has changed...

    I have a 2006 3.7 sport...
    As I understood I will need the following parts:
    https://jbaoffroad.com/jeep/liberty...ts/kj-ring-and-pinion-master-install-kit.html
    https://jbaoffroad.com/jeep/liberty...e-components/spicer-4-10-ring-and-pinion.html

    https://jbaoffroad.com/jeep/liberty...master-install-ring-and-pinion-rear-diff.html
    https://jbaoffroad.com/jeep/liberty...ro-gear-c8-25-410-ng-ring-and-pinion-set.html

    1. Is there any other worthy cheaper alternative ?
    2. What is the difference between the front axle master install kit and the following:
    https://jbaoffroad.com/jeep/liberty...xle-components/dana-30a-bearing-seal-kit.html

    Regards,
    Ariel.
     
  2. duderz7

    duderz7 Full Access Member

    Messages:
    312
    Likes Received:
    55
    Joined:
    Jan 20, 2016
    Location:
    Weiser, ID
    I'd consider a locker in the rear and maybe some kind of ls in front since your going to the trouble anyway. I haven't made either of these upgrades myself (something about time and money) so I'll let others advise from experience.
     
  3. Cardhu

    Cardhu Full Access Member

    Messages:
    683
    Likes Received:
    0
    Joined:
    Aug 29, 2011
    Location:
    Great White North
    you could consider finding a used Dana 30A from a 4 cylinder that will be 4.10s.

    You won't find a rear axle for the swap. I seem to recall something about metric ring gear bolts on the 2006 and 2007's. i'm sure somebody will remember.
     
  4. u2slow

    u2slow Full Access Member

    Messages:
    535
    Likes Received:
    15
    Joined:
    Mar 6, 2012
    Location:
    Salt Spring Island, BC
    I really liked the crush-sleeve eliminator for when I re-did the pinion bearings. Trial and check your install as many times as you like without junking a crush sleeve each time.

    The ring gear bolts went to 10mm for 2005 (from 3/8"). Not 100% sure if this is enough to worry about. Older carriers/lockers are made for 3/8" bolts to match older gears (i.e. XJ, Dakota, etc).