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Spindle question on a 6-to-8 lug coversion?????????

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by fad2blk99, Jul 15, 2003.

  1. fad2blk99

    fad2blk99 1/2 ton status

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    I'm doing the 6-to-8 lug conversion on my '89 Jimmy and my 3/4 ton spindles I got are identical to my old 1/2 ton spindles. I also checked with the parts store and the bearing P/N's are the same for both the 3/4 & 1/2 ton.... So why do I need 3/4 ton spindles?????
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    You don't, if the axles are 77 and newer, they're the same spindles.
     
  3. scrappyk5

    scrappyk5 1/2 ton status

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    so what you are saying is that i can go get 77 or newer
    8 lug spindles from a junkyard and i can put them right on my 1984 10 bolt 6 lug front end ?
     
  4. 83PJW

    83PJW 1/2 ton status

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  5. scrappyk5

    scrappyk5 1/2 ton status

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    is there a write-up on this ?

    or is it a simple as me pulling my 6 lug spindles off,
    installing new bearings of course and installing the
    3/4 ton 8 lug spindles ? what about the breaks and backing
    plates?
     
  6. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Here, read this and ask if you have more questions. /forums/images/graemlins/wink.gif

    [ QUOTE ]
    GM has two different types of axles: the "first design" and the "second design". For those who dont know the difference, the "first" goes from 73-76. The "second" goes from 77 to 91. Some differences are:

    1. Backing plates are ALL diffferent. Both 1/2 and 3/4 ton for both designs are NOT the same thing. 3/4 tons are larger diameter than the 1/2 tons. There are currently 6 different types of backing plates. The 1/2 ton has the 73-76, 77-80, and 81-91. 3/4 ton is the same years, but only bigger around.

    2. Bearing hub and rotors are different. There are 4 types. 73-76 use a smaller wheel bearing on both the 1/2 and 3/4 ton. The 1/2 ton bearing hub is an internal drive. 3/4 tons were available in both the internal and external drives. 77 and newer bearing hubs are the same size wheel bearing. 1/2 and 3/4 tons are all internal drives. The differences in the rotor diameter is the fact that the 3/4 tons are larger around than the 1/2 tons. This is why the backing plates are larger around than the 1/2 tons. If you use a 1/2 ton backing plate on a 3/4 ton rotor, the caliper will NOT even align up with the bolts. If the 1/2 ton rotor is used with the 3/4 ton backing plates, the caliper will NOT have enough pad contact with the rotor.

    3. Spindles. 73-76 are one type only. They are "first design" small bearings. 1/2 and 3/4 ton spindles are interchangable. 77-91 spindles are "second design" and all interchangable between 1/2 and 3/4 tons. You cannot use a first design spindle with a second design bearing hub & rotor. The hub will wobble in place. If the second design spindle is used with a first design bearing hub, the hub will not even go on at all.

    4. D44 and 10B axle shafts are not interchangable. The D44 shafts measure: right - 36.13"
    left - 18.31"
    10B shafts measure: right - 35.46"
    left - 19.15"

    5. Steering knuckles. D44's have the infamous "flat top" knuckles on the passenger side. These are good for the crossover steering for where the steering arm is mounted on top of the knuckle after machine work and drilling has been done. The 10B knuckles have NO flat surface whatsoever. Machine work would be excessive to make the crossover work and therefore would be easier and cheaper to locate the correct knuckle off a D44.

    All in all, when doing a swap like this, try to round up the parts off one truck to use on the other. Such parts to swap over would be: backing plates, spindles, bearing hub & rotors, and if desired for crossover steering, the knuckles.

    The knuckles do NOT need to be changed if you do not plan on the crossover steering.

    It all boils down to this: D44 and 10B parts ARE interchangable from the knuckles out. Anything else from the knuckles in is NOT interchangable.

    ALL calipers on both D44 and 10B are compatible with either axle. Even the first and second design axles are compatible with BOTH 1/2 and 3/4 ton calipers. So, whatever swap you plan on doing, you can retain your stock calipers.
    When stepping up to the big D60, this is a whole different ball game. Nothing is interchangable from the D44 and 10B to the D60.



    [/ QUOTE ]
     
  7. What about the adjusting nut, lockring and locknut? Since there's no mention of these I assume that they are all interchangable. /forums/images/graemlins/ears.gif
     
  8. Beast388

    Beast388 1/2 ton status

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    [ QUOTE ]
    is there a write-up on this ?

    [/ QUOTE ]

    Yes /forums/images/graemlins/thumb.gif
     
  9. fad2blk99

    fad2blk99 1/2 ton status

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    Perfect...
    Thanks... you guys rock!!!!
    /forums/images/graemlins/thumb.gif
     
  10. thatK30guy

    thatK30guy 1 ton status Premium Member

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    [ QUOTE ]
    What about the adjusting nut, lockring and locknut? Since there's no mention of these I assume that they are all interchangable. /forums/images/graemlins/ears.gif

    [/ QUOTE ]

    Same thing. Just some may look different than others, but same thing. D60's are bigger though. /forums/images/graemlins/wink.gif
     
  11. 84K5cedric

    84K5cedric 1/2 ton status

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    Wes,

    will there be a loss in strength by using the early spindle/hub setup when doing the 8 lug conversion on a second version axle? Meaning if I use a 75 8 lug setup on my 84, have I just lost strength by going to the smaller spindles/bearings?
     
  12. 84K5cedric

    84K5cedric 1/2 ton status

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  13. JDNobodi

    JDNobodi 1/2 ton status Premium Member

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    Hey Wes, I notice you chart only goes down to 73. What about pre 73 parts. I heard the part are different, and the old drum brake parts have even more differences that nothing interchange.
     
  14. scrappyk5

    scrappyk5 1/2 ton status

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    that is an excellant write , including pics and all.
    /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif

    off topic question , in the picture , it shows that the shocks have been placed farther back on the frame. whats the reason for this ?
     
  15. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Not necessarily. If there is strength loss, it would be very minimal as GM did run those smaller bearings on their trucks with no problems.
     
  16. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I covered the '73 and up because thats what the majority of the viewers here are.

    The pre-'73 axles especially those with drum brakes can be swapped to disc, but its a little more extensive to do. Number one is the knuckle design. Whether it has an open or closed knuckle and the axle shafts are smaller on the older axles, too.

    If it were me and I had a closed knuckle drum braked axle, I would simply replace it for something newer. Its not worth the time or hassle to round up parts for these older axles.

    But the '71 and up disc braked axles can be left alone. Just if you had an open knuckled drum braked, say '69 D44, I would try to find the '71 or '72 parts to get them converted since it will be easier to keep the truck "current" to the swappability years. /forums/images/graemlins/thumb.gif
     
  17. fad2blk99

    fad2blk99 1/2 ton status

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    [ QUOTE ]
    is there a write-up on this ?

    or is it a simple as me pulling my 6 lug spindles off,
    installing new bearings of course and installing the
    3/4 ton 8 lug spindles ? what about the breaks and backing
    plates?

    [/ QUOTE ]

    <font color="blue"> As I just learned... the spindles are not needed as the write-up states (if you have a '77 and up).
    All you'll need is the 3/4 ton rotor/hub assembly and the backing plates... </font>
     
  18. scrappyk5

    scrappyk5 1/2 ton status

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    ok , i am confused now
    all i need for my 84 is rotors and out ? for 3/4 ton?
     
  19. 84K5cedric

    84K5cedric 1/2 ton status

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    what you need is the backing plate, hub, and rotor from a 77 or later.... OR a backing plate, spindle, hub, and rotor from a 73 to 76.
     

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