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70CJ5 Axle Question

Discussion in 'Early CJ5 and CJ6 Tech' started by TIMBERWOLF427, Mar 15, 2005.

  1. Mar 15, 2005
    TIMBERWOLF427

    TIMBERWOLF427 Member

    Joined:
    Mar 6, 2005
    Messages:
    64
    Finally got our new toy home and it looks like the front axle has been replaced. The rear looks like its the original Dana 44 with 9" brakes but the front looks like a Dana 30 with 11" brakes. Now Im wondering what year the Dana 30 came out of and how can I tell if the ratio is the same as the rear? Is this anything to be concerned about? Thanks Don
     
    TIMBERWOLF427, Mar 15, 2005
    #1
  2. Mar 15, 2005
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Check for the usual tag on the differential.

    If it's unreadable take the cover off (you needed to change the gear oil anyway right? ;) ) and the numbers are stamped on the gears. Divide the larger by the smaller to get the gear ratios.

    Chances are they're the same, someone might have been goofy enough to not match 'em I guess.
     
    sparky, Mar 15, 2005
    #2
  3. Mar 15, 2005
    181jeep

    181jeep Banned

    central valley, ca
    Joined:
    Feb 3, 2004
    Messages:
    376
    lock the hubs, put it in 4 hi and see if it rolls. If it rolls ok it is most likely same gear ratio.

    JB
     
    181jeep, Mar 15, 2005
    #3
  4. Mar 15, 2005
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
    Messages:
    1,036
    My CJ is also a 70 but the rear dana 44 has the stock 10" brakes. Seems like most of the V6's had 3.73 gearing. I put in a later (about '78) dana 30 up front with disc brakes. If yours has 11" drums it's fairly old - you might try the Jeep tech section at offroad.com for axle info.. If you really think someone swapped the axle without matching the gears do the roll test like 181jeep said.

    1970 CJ-5, 225 V-6, headers, HEI, PS, D30 Fr, 44 Rr, ARB's, SM420 w/ Novak, D18 single stick, 33" TSL Radials, Ramsey REP 5000, Sky Jacker Soft Ride,
     
    AKCJ, Mar 15, 2005
    #4
  5. Mar 16, 2005
    TIMBERWOLF427

    TIMBERWOLF427 Member

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    Mar 6, 2005
    Messages:
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    Just tried the rolling method with the Jeep in third,hubs locked,transfer in 4 high and the Jeep rolled if a foot or so is enough to tell. There was a tag on the front axle that was marked "5354908 3.54 46-13" so Im assuming its a 3.54. Couldnt find a tag on the rear so I guess Ill change the gear oil and check inside to make sure they are the same.
     
    TIMBERWOLF427, Mar 16, 2005
    #5
  6. Mar 18, 2005
    Hill

    Hill Member

    Colorado
    Joined:
    Mar 7, 2004
    Messages:
    142
    one foot isn't enough. Another method (if no locker(s)) is to lock the hubs and jack both wheels on one side off the ground. TC in 4 high, and tranny in neutral. If both tires stay in sync, then all is well.

    I would want deeper gears than 3.54

    -Hill
     
    Hill, Mar 18, 2005
    #6
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