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454 with 10 bolt rear end?

Discussion in 'Differential & Driveline' started by Dleighton, Mar 8, 2019.

  1. Dleighton

    Dleighton Junior Member

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    Hi, I was wondering if anyone had any insight on how well a 10 bolt rear end would last after a 454 motor swap. I just had it rebuilt last year, 4.56 gears, 35 inch tires. I know it's not an ideal set up, but I am having trouble finding a good deal on a different set up. The motor is a stock rebuild, nothing crazy it came out of an 88 motorhome. Any insight would be appreciated, thanks
     
  2. Dleighton

    Dleighton Junior Member

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    Oh and the transmission is the sm465
     
  3. 78C10BigTen

    78C10BigTen Full Access Member

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  4. bucket

    bucket Super Moderator Staff Member

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    If you just cruise around it will likely be fine. If you use the truck for truck stuff, don't ever bet the farm on it holding up.
     
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  5. 82sbshortbed

    82sbshortbed Supporting Member Supporting Member

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    Yeah I was thinking just that when I swap in the 454 here soon I hope. Would you switch to a 12 bolt? Mines 2wd and tires are only 29" tall.
     
  6. Frankenchevy

    Frankenchevy . Supporting Member

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    Just out of curiosity, because I really don’t know any better...

    If swapping already, is there a reason not to go straight to 14ff? It seems like they’re a dime a dozen on CL near me.
     
  7. shiftpro

    shiftpro Full Access Member

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    Ok I will list all the reasons you do NOT want a 14bolt...
    1.
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    5.
    6.
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    8.
    9.
    10.
     
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  8. Frankenchevy

    Frankenchevy . Supporting Member

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    I figured, just didn’t know if there was some consideration I was missing.

    I’ve never really had to think about it, as my foray into squarebodies has been a d60/14ff k30.
     
  9. bucket

    bucket Super Moderator Staff Member

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    A 2wd can get away with a lot more if it's a fun street truck.

    For a 4wd that 6-lug wheels are desired, a GMT 6-lug 14sf axle is an option.
     
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  10. Olin

    Olin Junior Member

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    What do you guys think about a 12 bolt holding up to a 383? Am I just going to be spinning that inside tire everywhere I go? Can it take the torque? I don’t plan on doing smoke shows or any extreme off roading.
     
  11. Olin

    Olin Junior Member

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    78 k10 long bed, 3 speed with granny.
     
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  12. rpcraft

    rpcraft Full Access Member

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    If you are prone to using your throttle like a light switch it probably won't last too long but there has been plenty of 10 bolt axles behind big blocks since forever ago and it should last fine as long as you are not getting the tires glued down and doing clutch drops.
     
  13. 1973c10

    1973c10 Full Access Member

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    Just my .02
    I have a 12 bolt in my stepside with a built 454 4 speed 3.73 gears with 28in tires
    and I have hammered on it and haven't had any problems with it
     
  14. shiftpro

    shiftpro Full Access Member

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    I hear ya Don but I just have to say (to everyone else)

    ..WARNING.. This doesn't mean a 12 bolt behind a bbc can handle getting hammered on forever, by whoever..! ... END OF WARNING..
     
  15. shiftpro

    shiftpro Full Access Member

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    Too bad you threw all that $ into a 10 bolt. Oh well, at parts for that are not near as much as say... gears from a D60!
    And if you're running BB and 35" tires, you really do need a D60 up front and back or the lovely GM14bolt10.5.

    Check and see what the heads are.. Pop a valve cover and look for the casting #... come back here with the last 3 numbers. Late 80's is a really good year for blocks, it will be the 4 bolt main I believe, and clearanced for a 4.25 stroker crank. Heads are probably shit so don't hold your breath. Things get changed
    and sometimes for the better.
     

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