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Thread: 8 lug front hub swap on 10 bolt

  1. #1
    86 350/TH350/208 6" & 39' Senior member Ahays000's Avatar
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    8 lug front hub swap on 10 bolt

    Some of you may have seen this in my build thread, but I figured I would post it here as well with more detail.

    A little background... about a month ago I swapped a 14 bolt into the rear of my 86 Blazer, I picked up a new set of 8 lug wheels and needed to do something to match up front. Obviously I want a Dana 60, but that's more of a long term plan. All the 3/4 ton front ends I found were way over priced and my axle was still in great shape.

    Seven07 picked up a 79 K20 parts truck so we made arrangements and he sent me everything I needed for the swap.

    Here's what I got:


    Cleaned up the hubs and backing plates:



    Stripped the wheels, calipers, lockouts and 6 lug hubs off the front end:


    Here you can see the 6 nuts that hold one the backing plate:


    With everything removed I did some cleaning and sprayed a little black paint:



    I double checked to be sure the spindles on my 86 were identical to the 3/4 ton donors. They were the exact same so I left them in place.

    Next I bolted up the new backing plate:


    I compared these side by side and it is obvious that the 3/4 ton backing plate is larger and has different caliper mounts:


    After repacking the bearings and replacing the seals I slid the hub on and tightened up the nut:


    Put the brakes, wheels and lockouts back on and we are all set:


    There are a few advantages to this swap, the first is obviously the matching 8 lug wheel pattern.

    Also the 3/4 ton rotors are 12-1/2" in diameter as the 1/2 ton are only 11-3/4", the pistons in the calipers are also larger.

    All the bearings are the same so no real advantage in weight carrying capabilities.

    Also before the swap my axle was 67" wide from WMS to WMS it is now 69-1/2". This is good because I am running a 14 bolt out of a van that is 70" from WMS to WMS.

    I hope you will find this helpful and if you have any questions feel free to ask.

  2. #2
    (Brent) Senior member NightKrwlr's Avatar
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    so the 3/4 tons are a little bit wider huh? learn something new every day. i never measured my hubs.
    When the clutch drops... the bullsh*t stops

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  3. #3
    Yawnnn!....... Lets hit the woods. Chief Hunglikmule Just-speed's Avatar
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    Good job sharing.
    Just-Speed (Mike)
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  4. #4
    Damage case Senior member junkyard dog's Avatar
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    thats good to know... in the event i change my blazer to3/4 ton
    1981 blazer- the junkyard dog...rat wheeler....built to go , not for show
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  5. #5
    I drive a Jeep now! Chief Hunglikmule Skin-K5's Avatar
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    Very cool man!

  6. #6
    Knows their $hit y0gisdad's Avatar
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    good to know...thanks

  7. #7
    The man, the myth, the legend mruneek's Avatar
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    Quote Originally Posted by Ahays000 View Post
    Also before the swap my axle was 67" wide from WMS to WMS it is now 69-1/2".
    i was woundering this? thank u for measuring.
    this is a great write up

  8. #8
    Senior member digthedirt's Avatar
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    Also before the swap my axle was 67" wide from WMS to WMS it is now 69-1/2". This is good because I am running a 14 bolt out of a van that is 70" from WMS to WMS.

    Great job! Sorry, may be a stupid question, but what is WMS?
    Last edited by digthedirt; 11-17-2011 at 05:51 PM.



    90' Blazer, 355 TBI 700R4 10 Bolts w/rear Eaton Posi 9500 Mile Marker winch hidden behind frt. bumper

  9. #9
    Eric Senior member shovelhead77's Avatar
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    [QUOTE=digthedirt;850 Great job! Sorry, may be a stupid question, but what is WMS?[/QUOTE]
    wheel mounting surface
    build thread http://www.chevyk5blazer.com/forums/...77-s-90-blazer


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  10. #10
    72' Yea its a convertible Senior member jackedjimmy72's Avatar
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    Awesome writeup man!
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