Register now to get rid of these ads!

Hot Rods Chevy Rear ending question

Discussion in 'The Hokey Ass Message Board' started by jhouse88, Jul 4, 2018.

  1. jhouse88
    Joined: Mar 1, 2011
    Posts: 224

    jhouse88
    Member
    from toledo

    I recently bought a p case rear axle off a guy that claimed it was a 456 outta a 1962 Chevy. But it has factory leaf spring mounts and correct me if I’m wrong but would an impala be coil overs? It’s out of a model a coupe that was bought at the meltdown drags. It’s def a two wheel peeler but not positive it’s a posi or a spool. My question is how do I identify it for sure so I can order a ring and pinion to rid myself of the 456s. I don’t believe the tag is there anymore


    Sent from my iPhone using H.A.M.B.
     
  2. vinfab
    Joined: Apr 18, 2006
    Posts: 77

    vinfab
    Member
    from midwest

    It can be a 62 housing that somebody cut the coil spring mounting points off and welded on leaf spring pads. Its highly unlikely that there is a spool in there. From the factory it came with a Dana Power Lok. Pictures and or casting numbers would help to identify it.
     
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 41,221

    squirrel
    Member

    take it apart, post large, detailed, clear pictures, and we can help you figure it out.
     
    lothiandon1940 likes this.
  4. WDobos
    Joined: Jan 7, 2007
    Posts: 218

    WDobos
    Member

    There is a date code on the housing. The "ham" could be from a 62 ,but the axle from a 55 to 57 Chevrolet as the "hams" all interchange
     
    Register now to get rid of these ads!

  5. porknbeaner
    Joined: Sep 12, 2003
    Posts: 40,727

    porknbeaner
    Member

    Leaf spring mounts could have been a '62 Truck. Truck arm mounts and leaf spring mounts look the same.
     
  6. jnaki
    Joined: Jan 1, 2015
    Posts: 2,980

    jnaki




    Hey J,
    From my experience with 55-58 Chevy rear axle housings in many different combinations there are ways to check. If it is a true Positraction gears and housing, there will be a definite "fishy" smell to the gear lube used. Posi gear lube oil is definitely smelly vs the stock non posi oil. The second is the old "raise the car, spin the tires, both go forward at the same time" ...test.

    We used the last test on many of our friend's 55-60 Chevy cars. We also had a 56 Chevy Positraction 4:11 gears in our 40 Willys Coupe build to start. We swapped out the 58 Impala 4:56 gears for the 4:11 gears that made the best times in both cars. (Always remembering to use the smelly fish style oil made specifically for positraction gear units.) For us, Positraction does work and it does it well. Good slicks also help unless you are in a misty environment or rain.


    Jnaki

    If you are going to use the hot rod for the drags and street, it was handy for us to have a second 3rd member already loaded with 4:11 gears for an easy swap, prior to long distance cruises. 4:56 gears are only for the drags, not long distance driving. If you have a 3:55 or 3:78 gears, that is better for long distance. But, not so much at the drags.
     
  7. squirrel
    Joined: Sep 23, 2004
    Posts: 41,221

    squirrel
    Member

    truck rear ends and car rear ends were quite different...the truck has a round center, the car is oval shaped. And trucks had coils in back starting in 1960.
     
  8. movin/on
    Joined: Jan 18, 2007
    Posts: 985

    movin/on
    Member

    Corvettes had leaf spring rear axle housings thru 1962.
    My understanding is (but i'm not certain) they are the same width as the 55-57 Chevy's

    Movin/on
     
  9. jhouse88
    Joined: Mar 1, 2011
    Posts: 224

    jhouse88
    Member
    from toledo

    Thanks all, I’m working but when I get home I snap some pics of the numbers. The tires def soon in both directions when spin forward.


    Sent from my iPhone using H.A.M.B.
     
  10. squirrel
    Joined: Sep 23, 2004
    Posts: 41,221

    squirrel
    Member

    snap pics of the entire rear end, also.
     
  11. jhouse88
    Joined: Mar 1, 2011
    Posts: 224

    jhouse88
    Member
    from toledo

  12. squirrel
    Joined: Sep 23, 2004
    Posts: 41,221

    squirrel
    Member

    looks like it's probably a 55-57 housing, the leaf spring perches look original.

    As mentioned, it's very common to have a different center section swapped in, especially in a hot rod.
     
    Johnny Gee likes this.
  13. ^^^^^ 10 model years worth of interchange.
     
  14. flamedabone
    Joined: Aug 3, 2001
    Posts: 4,300

    flamedabone
    ALLIANCE MEMBER

    Your current ladder bar set up is not going to be very pleasant on the street. If one wheel hits a bump, the parallel ladder bars will act like a big giant anti-roll bar. Your best bet is make new brackets to angle the bars towards the center of the car and use heim joints at the rear and rubber bushings in the front.

    Kind of like this
    [​IMG]

    -Abone.
     
    gimpyshotrods likes this.
  15. 325w
    Joined: Feb 18, 2008
    Posts: 5,045

    325w
    Member
    from texas

    Didn't the real positrac pumpkin housing have a P cast in it ? 1957 housing will have a drain plug in the bottom also.
    Corvette I'm thinking is same width.
     
  16. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 5,314

    56sedandelivery
    ALLIANCE MEMBER

    You seriously need to know the EXACT year of the HOUSING when it comes to axles and axle bearings; 55-56 are the same, 57 is all by itself, 58 on are mostly the same regarding axles/bearings. There are also some minor differences in the THIRD MEMBERS, but basically, 55-64 full size cars, 62-63 Chevy II/Nova, and 56-62 Corvettes are all interchangeable. But, stay away from the early Chevy II/Nova third members as they use a thinner casing and smaller bearings. It does look like a "P" case, if my eyes are't deceving me. With the 4.56 gears, you'll need to know what series the carrier is when it comes to changing to more street friendly gears; it can get confusing in regards to gear spacers, thick or thin ring gears, and solving those issues. I'm going to guess your housing is a 55-56, but if it has a drain plug, then it's a 57. The stock spring pads are only spot welded to the housing with 3 spot welds on each side of the spring pad (total of 6 spot welds). Only reason I say that is, they could have been added by someone, and would then most likely have full weld beads on the pads. Axle bearings will have ID numbers on them; that will help you figure out exactly what you have. The Corvette's are the same width. DZAUTO over on ChevyTalk.Org is the true guru on these rears, and he will gladly answer PM's from anyone. Tom Ordway is another member there with extensive knowledge of them. I am Butch/56sedandelivery
     
  17. porknbeaner
    Joined: Sep 12, 2003
    Posts: 40,727

    porknbeaner
    Member

    The trucks had a trailing arm suspension starting in '60 ( uh I think). The rear mounted to the trailing arm and had spring pads along the same lines as a car with leaf springs. The coils mounted to the trailing arms not the rear end housing.

    Now this is a Jim question??????. I do not know what year the truck stopped using the drop out chuck and went to a more contemporary GM rear. My '65 had a 12 bolt and not a drop out chuck. Do you recall what year they changed over? Was it '65 or earlier?

    truck%20frame%201232%20vinWEB.jpg
     
  18. squirrel
    Joined: Sep 23, 2004
    Posts: 41,221

    squirrel
    Member

    63 was the first year for the truck 12 bolt rear. The drop out third member was used through 1962.
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2013 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.