3.42 Eaton Posi.

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

  1. suntreemcanic

    suntreemcanic Active 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 Active 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 Active Member

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

    monzaz Jim

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    Last edited: Jan 3, 2020
  15. Jim Wall

    Jim Wall Well-Known Member

    PM sent
     
  16. suntreemcanic

    suntreemcanic Active Member

    Differential is sold
     

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