3.42 Eaton Posi.

Discussion in 'Got gears?' started by suntreemcanic, Dec 11, 2019.

  1. suntreemcanic

    suntreemcanic Well-Known Member

    I have sold it. I have a 3.42 Eaton Posi. with 31 spline axles. I was told it came out of a 1973 454 Caprice. It has a 10 bolt cover but has 12ea 1/2 inch bolts holding ring gear to carrier. The code on the axle housing is VE P 257. I can get more measurements. Does anyone recognize this?
     
    Last edited: Jan 16, 2020
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

  3. BrianTrick

    BrianTrick Brian Trick

    Sounds like the big 12-bolt. There weren’t too many with a desirable gear ratio.
     
  4. suntreemcanic

    suntreemcanic Well-Known Member

    It is larger physically than a 12 bolt chevy rear end. I measured the ring gear and it is 8 and 7/8 " outside diameter, same as a chevy 12 bolt. There are 12 bolts that connect the ring gear to the carrier. They are 1/2 " NF left hand thread. The only numbers on the ring gear are GM 41:12 1 73. I recounted the splines, I stand corrected there are 31 splines. The wheel stud bolt pattern is 5 x 5.
     
  5. BrianTrick

    BrianTrick Brian Trick

    GM could have done so much with that design,but didn’t.
     
  6. monzaz

    monzaz Jim

    That is a full size car rear - 10 bolt PONTIAC looking cover (like a GTO) But bigger.
    The ring gear bolts are 7/16" 20 thread pitch and left hand thread bolts
    1978 - 1987 they were used in Wagons and Caddy devilles etc. came in 28 spline and 31 spline
    These rears were the same width and would bolt right into a 73-77 A-body car. That is how much a B-body chassis got in 78-87...lol

    1973-1977 A- body cars had a version of this rear too BUT they were 5 on 4.75 medium car bolt pattern.
     

    Attached Files:

  7. BrianTrick

    BrianTrick Brian Trick

    I would think someone with a big car would want that rear. Not too many of them had a desirable gear ratio.
     
  8. monzaz

    monzaz Jim

    Yes BUT remember it is a 1978 - 1987 Big car...lol.
    NOT the 1971-1976 Big car.
    1978 - 1996 were rear ends from A body chassis cars from 1973 1977
     
  9. BrianTrick

    BrianTrick Brian Trick

    He said it’s from a 1973 Caprice 454.
     
  10. monzaz

    monzaz Jim

    God, WHERE the heck did I get Monte Carlo from....LOL (READ JIM) Geez...I am OLD!

    Yah that will be super wide. 64" - 65" drum to drum ish
    Will fit all the 1971 -1976 B-body cars 4 link control arms, shocks in front of axle tubes
     
  11. Jim Wall

    Jim Wall Well-Known Member

    Hello
    I would be interested in this axle if for sale?
    Jim
     
  12. Bigpig455

    Bigpig455 Fastest of the slow....

    Next in line if its up for grabs
     
  13. suntreemcanic

    suntreemcanic Well-Known Member

    Jim Wall, just got back from vacation. Can not figure out how to contact you, contact me.
     
  14. monzaz

    monzaz Jim

    --------------------
     
    Last edited: Jan 3, 2020
  15. Jim Wall

    Jim Wall Well-Known Member

    PM sent
     
  16. suntreemcanic

    suntreemcanic Well-Known Member

    Differential is sold
     

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