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14 bolt SF 8-lug to 6-lug convert??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 79Jimmy, Apr 20, 2001.

  1. 79Jimmy

    79Jimmy 1/2 ton status

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    Just wondering if anyone knows whats involved in this swap...Got a line on a cheap 86 3/4t Suburban 14 bolt SF rear with 8-lugs. I know the axles and drums can be redrilled but would like to avoid this and be able to use off the shelf replacment parts. Is the only difference the axles and drums or are all the internal brake bits different requiring all new parts from the backing plate out??? Whats the width of this axle compared to a 12 bolt? Basically looking for as much info and insight on this from the vast resourses here on CK5.
    Thanks guys,
    James


    79jimmy@home.com
     
  2. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>I've heard of people putting in 88+ 6 lug shafts, but I've also heard those housings are wider, so how does that work? Off-the-shelf 6 lug drums should work, but the shafts will probably have to be machined or custom made.</font color=blue>

    [​IMG]
     
  3. 79Jimmy

    79Jimmy 1/2 ton status

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  4. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Yeah, I did some checking on this. ORU says: get the shafts, drums, backing plates all from a 6 lug SF from 88 and newer. They will bolt right in. Very simple. The housing lengths are the same. This makes for some very simple rebuilding and swapping since the parts interchange and the spring perches are in the correct location, especially when using the 87 and older SF rears. If disc brakes are wanted, get the stuff from TSM for the 88 and newer years.
     
  5. 90K5

    90K5 1/2 ton status

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    I thought you dont need the backing plates?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  6. bandit

    bandit 1/2 ton status

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    the latest petersons 4-wheel drive and off road as a tech article on this if it where me id look fora 3/4 light duty chevy 88 and newer becosue thats what the are a 14 sf 6 lug

    AJ
    (Your right i dont understand the jeep thing)
     
  7. Emmettology 101

    Emmettology 101 3/4 ton status

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    NAtional Drivetrain has the axle shafts forabout $89 ea.. 6luggers.... They have an overall measurement of them, give them a call, they will tell you the measurement and then you can measure the 8 lug shafts...

    Mike - <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>[​IMG]
     
  8. 1990K5

    1990K5 1/2 ton status

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    Re: 14 bolt SF 8-lug to 6-lug convert?? *DELETED*

    Post deleted by 1990k5
     
  9. 90K5

    90K5 1/2 ton status

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    The 88 and newer trucks axles wont bolt up. Theg spring pads and shock mounts are different. The best way to do this swap is to get an 8 lugger from a 81-87 3/4 ton and swap out the axleshafts and drums.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  10. 6.2Blazer

    6.2Blazer 1/2 ton status

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    The SF and FF 14-bolts are completely different. On the FF versions, the axleshafts have nothing to do with the wheel lug pattern and it would require quite a bit of work to convert it to 6-lug. I believe ORU offers a FF 14-bolt with a 6-lug pattern......but in order to get the 6-lug pattern it was converted to a SF design and they are pretty pricey ($2,000+).

    On the other hand, you can convert an SF 14-bolt over to 6-lug by simply redrilling the axle shafts and drums, or swapping over to 6-lug parts (assuming the axleshaft length is the same).
     

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