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Hot Rods Jeep CJ rear axle in 30 Model A

Discussion in 'The Hokey Ass Message Board' started by Fomoco998, Mar 23, 2018.

  1. Fomoco998
    Joined: Feb 12, 2018
    Posts: 22

    Fomoco998

    Got a killer deal on a Jeep CJ rear axle measuring 50.5 inches wheel to wheel 3.54 posi Do you guys see any problem running it with full fenders behind the Ford 2.8 V-6 . Mostly concerned about it being that narrow . Thanks
     
  2. that 50-1/2" is wheel mounting surface to wheel mounting surface? if so , without even knowing your wheels/tires that's going to be a bit narrow for a `30 model A ford
     
    Hnstray likes this.
  3. Hombre
    Joined: Aug 22, 2008
    Posts: 1,045

    Hombre
    ALLIANCE MEMBER

    The stock axle on a model A was 57". On my chopped Model A I am running a 56" 9" Ford and that is about as narrow as "I" would want to go.
     
    JOYFLEA likes this.
  4. Mr T body
    Joined: Nov 2, 2005
    Posts: 2,174

    Mr T body
    Alliance Vendor
    from SoCal

    My '31 was narrowed to 53" and that's about as far as you can go.
     

  5. This chart might help. HRP

    56.50 1969-1977 Maverick 8"
    56.50 1990-1992 Ford Ranger 8.8"
    56.75 1995-2003 Ford Explorer 8.8" Narrowed w/2 short side axles
    57.00 1974-1978 Mustang II 8"
    57.25 1957-1959 Ford, Ranchero, Station Wagon
    57.25 1965-1966 Mustang
    58.00 1966-1977 Bronco
    58.00 1964-1965 Falcon
    58.00 1977-1981 Granada/Versailles
    58.50 1977-1981 Versailles
    58.50 1993-2009 Ford Ranger 8.8"
    59.25 1967-1970 Mustang, Fairlane, Comet, Cougar
    59.81 1995-2003 Ford Explorer 8.8" 31 Spline Disc Brake
    60.00 1967 Cougar
    60.00 1958-1960 Edsel
    61.00 1964-1971 Ford Full Size
    61.00 1949-1951 Mercury
    61.25 1957-1972 Ford F-100 Pickup
    61.25 1960-1964 Ford Full Size
    61.25 1971-1973 Mustang
    61.25 1967-1973 Torino, Ranchero, Fairlane
    63.00 1970-1979 Ranchero & Torino
    63.00 1972-1979 Ford Full Size & Intermediate
    63.50 1967 Fairlane (Coil Springs)
    65.25 1973-1986 Ford F-150 Pickup
    65.25 1978-1986 Bronco
    65.25 1973-1986 Ford Van 3/4 Ton
    68.00 1972 Ford Van 3/4 Ton
    69.25 1977-1986 Ford E-150 Van
     
  6. Budget36
    Joined: Nov 29, 2014
    Posts: 5,240

    Budget36
    Member


    I think that'd be backing plate to backing plate, not WMS to WMS?
     
  7. Hnstray
    Joined: Aug 23, 2009
    Posts: 11,744

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    The OP doesn't specify exactly which model CJ the axle is from. However, Jeep CJ2 thru CJ6 are much narrower than CJ7/8 and later YJ, TJ etc. models. I think his numbers sound reasonable for the earlier models and the 2wd DJ as well.

    Ray
     
  8. Fomoco998
    Joined: Feb 12, 2018
    Posts: 22

    Fomoco998

    Just saw the rear end but didn't measure it . It's complete and had the 5 on 5.5 bolt pattern and the guy called told me the rest of the info and offered it up for $100 . I'll look with a ruler he also has a Pinto and Ranger rears to look at . Thanks
     
  9. GTS225
    Joined: Jul 2, 2006
    Posts: 1,175

    GTS225
    Member

    Now, if the Ranger rear is an 8.8, that might be the way to go. I hear that the Jeep rears are not known for their strength.

    Roger
     
  10. upspirate
    Joined: Apr 15, 2012
    Posts: 2,243

    upspirate
    Member

    Some of the Pinto rears are 8" , some are a smaller one. They all have 4 bolt wheel patterns
     
  11. continentaljohn
    Joined: Jul 24, 2002
    Posts: 4,730

    continentaljohn
    Member

    I put a 1975 jeep rearend Dana 44 in a 1931 model a coupe . This was many years ago over 20 and pro street was the look. So we tub it a bit and pretty much to the sub rails and ran some meaty pro track tires. It looked awesome and had the race car look more then the giant tub most pro street have.
     
  12. A Jeep Dana 44 posi can handle some good HP...not Big Block hp....but for what it's worth....most postal Jeeps don't see much hard take off's or burn outs......
     
  13. 53 ford
    Joined: Apr 8, 2012
    Posts: 143

    53 ford
    Member

    I have a '85 cj wide track under my '29. One piece axles(29 spline), it has 8 7/8 ring
    gear. I like it. The differential is offset so it left room for a 16 gal. tank on the passenger side under the bed.
     
  14. Hombre
    Joined: Aug 22, 2008
    Posts: 1,045

    Hombre
    ALLIANCE MEMBER

    Depending on what exactly was in that Jeep, there were several rear ends in Jeeps, it could be good all but the width. If you are lucky enough for it to be a Dana 44, and it certainly could be one, they were used in a lot of cars and trucks. Corvettes came with a Dana 44 for at least 12 or 15 years in there independent rears, and almost all independent Jags from 1961 used a Dana 44 center section.

    That's the good news, now it could also be several other rear ends, and most of those were pretty weak. best thing to do is to find out what you have. In the end however you are still stuck with a pretty narrow rear for a Model A
     
  15. GTS225
    Joined: Jul 2, 2006
    Posts: 1,175

    GTS225
    Member

    Hombre makes a very good point. Find out what you have, then make the decision. If it's a D44 you're good, but if it's a D30 out of a four-banger Jeep, then leave it behind.
    D44's could also be had out of I.H. Scout II's. and if it's a rear from a '75 or later, it'll have limited slip.

    Roger
     
  16. continentaljohn
    Joined: Jul 24, 2002
    Posts: 4,730

    continentaljohn
    Member

    image.jpeg A jeep Dana 44 from 1971 to 1975 will have a pumpkin that is in the middle or centered . This is because they were still running the 18 transfer case .
    The model 20 jeep rearend in later jeeps 1976 to 81 had this rear and isn't to bad either . Don't do any hole shots it has a weak pinion support bearing . My buddy race yes race his jeep with the model 20 for a few years but upgraded to one piece axles.
     
  17. mountainman2
    Joined: Sep 16, 2013
    Posts: 320

    mountainman2
    Member

    Not seeing the need for the the strength of a Dana 44 or an 8.8 with this combo. If it fits, use it.
     

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