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axle ratio

Discussion in 'Early CJ5 and CJ6 Tech' started by John O, Oct 24, 2004.

  1. Oct 24, 2004
    John O

    John O Member

    Tewksbury MA
    Joined:
    Sep 22, 2002
    Messages:
    149
    Hey all.
    I was told that my 65 CJ5 had 5.38s
    I was out comparing the axles with my 57 pickup cause it seems to rev higher. Sure enough the truck has 4.88s, so I checked the 5. Lifted a tire and rotated it twice and the U-joint rotated 4.1 turns. 4.10! Is that common? Any guess as my top speed if I pull the OD?
     
    John O, Oct 24, 2004
    #1
  2. Oct 24, 2004
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,389
    Should be 4.27s in there, if not 5.38's.
     
    Glenn, Oct 24, 2004
    #2
  3. Oct 24, 2004
    Dually

    Dually I'll get "a round tuit"

    Brookhaven...
    Joined:
    Aug 29, 2004
    Messages:
    8
    My 65 had 5.38's I switched axles to some 3.73's out of a 76 CJ 7 when I put the V6 in. It would scream at 35 MPH with the 5.38's
     
    Dually, Oct 24, 2004
    #3
  4. Oct 24, 2004
    Sol Searcher

    Sol Searcher New Member

    LAX
    Joined:
    Oct 13, 2004
    Messages:
    19
    I've had my 66 CJ-5 with the Dauntless for 30 years, and I thought it came original with 3.73's??
     
    Sol Searcher, Oct 24, 2004
    #4
  5. Oct 24, 2004
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,389
    4 cyl. came with either 4.27 or 5.38 gears, originally 5.38 was standard, early '60s switched to 4.27 being standard. V6 came with 3.73 standard and 4.88 optional.
     
    Glenn, Oct 24, 2004
    #5
  6. Oct 25, 2004
    Fhead Guy

    Fhead Guy Member

    Northern VA
    Joined:
    Apr 29, 2003
    Messages:
    83
    5.38 axles with a Warn OD engaged will work out to about a 4.10 ratio. Any chance you had the extra lever forward?
     
    Fhead Guy, Oct 25, 2004
    #6
  7. Oct 25, 2004
    Southtowns27

    Southtowns27 Custom Title

    The Backhills of...
    Joined:
    Feb 4, 2003
    Messages:
    536
    That won't effect how many times the driveshaft turns relative to the wheel though...

    Any chance someone may have swapped in different gears at some point?
     
    Southtowns27, Oct 25, 2004
    #7
  8. Oct 25, 2004
    jeepdaddy2000

    jeepdaddy2000 Active Member

    Eagle Point oregon
    Joined:
    Jun 24, 2004
    Messages:
    1,192
    Ok, first drop the diff cover and do a tooth count(chances are that the oil needs changing anyway). Divide the ring gear count by the pinion count to get the correct gear ratio. Then let us know what it is as well as your tire size and we can give you a general idea as to top speed. Of course you could put the OD in direct drive and drive as fast as you can.
     
    jeepdaddy2000, Oct 25, 2004
    #8
  9. Oct 25, 2004
    JohnyJeep

    JohnyJeep BLOWING A XING NEAR U@2AM

    Beautiful Cody WY
    Joined:
    Sep 22, 2002
    Messages:
    513

    Whatever the speedo shows when the rods come out the side of the block R)R)
     
    JohnyJeep, Oct 25, 2004
    #9
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