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Technical Can someone please identify this axle....

Discussion in 'The Hokey Ass Message Board' started by Silent Matt, Feb 1, 2017.

  1. Silent Matt
    Joined: Jun 5, 2009
    Posts: 63

    Silent Matt
    Member
    from Arkansas

    I picked up a '70 Dart that was formerly a drag car and I'm not sure what rear end is in it.
    Any help would be greatly appreciated. Sorry for the crappy pic. The axle tubes are swaged down into the housing, but I don't have tube diameter measurements and the car isn't at my house at the moment. The bolt pattern measured 5 on 4 1/4.

    [​IMG]
    [​IMG]
     
    Last edited: Feb 1, 2017
    kidcampbell71 likes this.
  2. daliant
    Joined: Nov 25, 2009
    Posts: 692

    daliant
    Member

    Late 70's - 80's Chrysler 7 1/4 rear w/1o bolt cover and the 2 1/2" to 3" swedged axle tubes, probably out of a Diplomat or Gran Fury.
    Was probably just thrown under the car to make it a roller, not a very desirable rear end.
     
    Last edited: Feb 1, 2017
  3. saltflats
    Joined: Aug 14, 2007
    Posts: 12,594

    saltflats
    Member
    from Missouri

    Looks like an 8 1/4 Chrysler
     
    redo32 and wraymen like this.
  4. Could be a Mopar 8 1/4
     

  5. I type slow, 7 1/4 had 9 bolts, 8 1/4 had 10.
     
  6. Silent Matt
    Joined: Jun 5, 2009
    Posts: 63

    Silent Matt
    Member
    from Arkansas

    I thought 7 1/4's had 9 bolt covers? I can't find any pics of a 7 1/4 or 8 1/4 with swaged tubes.

    I type slow as well...
     
  7. onetrickpony
    Joined: Sep 21, 2010
    Posts: 753

    onetrickpony
    Member
    from Texas

    There are 2 different Mopar 7.25s. That looks like the one used in a Dakota pickup and some Jeeps.
     
  8. saltflats
    Joined: Aug 14, 2007
    Posts: 12,594

    saltflats
    Member
    from Missouri

    In 73 it was standard on 340 Dusters and Darts
     
  9. daliant
    Joined: Nov 25, 2009
    Posts: 692

    daliant
    Member

    Late 7 1/4's had 10 bolt stop sign shaped covers, 8 1/4's also have 10 bolt covers but is more oval shaped, Early 7 1/4's had 9 bolt covers.
     
    wraymen likes this.
  10. Silent Matt
    Joined: Jun 5, 2009
    Posts: 63

    Silent Matt
    Member
    from Arkansas

    Well that stinks, guess I'll look for an 8 1/4 or 8 3/4. Tons of 9" on craigslist though...
     
  11. saltflats
    Joined: Aug 14, 2007
    Posts: 12,594

    saltflats
    Member
    from Missouri

    I would look for an 8 3/4 unless you are going to put some serious H/P through it.
     
  12. Silent Matt
    Joined: Jun 5, 2009
    Posts: 63

    Silent Matt
    Member
    from Arkansas

    I don't see many 8 3/4's around here. Shouldn't see more than 550hp.
     
  13. squirrel
    Joined: Sep 23, 2004
    Posts: 55,941

    squirrel
    Member

    4 1/4" bolt circle? I've heard of 4" and 4.5" but not 4.25"
     
    need louvers ? likes this.
  14. Silent Matt
    Joined: Jun 5, 2009
    Posts: 63

    Silent Matt
    Member
    from Arkansas

    I know, could've sworn I measured 5 1/4 but that didn't sound right either. I was in a hurry and a little flustered, so maybe I'm remembering it wrong.
     
  15. gene-koning
    Joined: Oct 28, 2016
    Posts: 4,040

    gene-koning
    Member

    With the rubber plug in the filler hole, its a late model 8 1/4, and it will have a 4 1/2" bolt pattern circle. The older 7 1/4 out of the original Dart would have had a 4" bolt pattern circle, but they should have had a screw in filler plug.

    At any rate, if its going to see 550 hp, neither of the two axles suspected of being in there will take that kind of power, if there is any traction there. You better be looking at a 9 3/4, or pickup one of those 9" Ford rear ends and put in it.
    The Ford 9" rear axle assembly is going to be the cheapest rear that will stand a chance at surviving traction and 550 hp. Gene
     
  16. The only Chrysler I know of with a 5 on 4.25" bolt pattern was the 90-92 Dodge Monaco
     
  17. el Scotto
    Joined: Mar 3, 2004
    Posts: 4,698

    el Scotto
    Member
    from Tracy, CA

  18. metalman
    Joined: Dec 30, 2006
    Posts: 3,297

    metalman
    Member

    The 4 1/4 bolt pattern was common on 60's A body Mopars. Had several back in the early 70's, really limited your wheel choices, especially if you wanted 15" rims. A body 8 3/4 rear axles were real tough to find back then, my guess custom built would be about the only way to get one now days.
     
  19. el Scotto
    Joined: Mar 3, 2004
    Posts: 4,698

    el Scotto
    Member
    from Tracy, CA

    That bolt pattern is 5x4", not 4 1/4".

    I've had numerous Valiants... :p


    Sent from my iPhone using The H.A.M.B. mobile app
     

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