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back spacing....

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Impex, Apr 5, 2000.

  1. Impex

    Impex 1/2 ton status

    Joined:
    Feb 17, 2000
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    Location:
    Chandler, AZ
    on my 78 1/2 ton chevy with 4" lift and 33x12.50 tires
    already have them...but i want different rims..Just bought
    the truck, ive read to clear these tires (for no rubbing) i should run 3 5/8 Inches backspacing on a
    15x10 rim i just want to double check now with this
    ill get no rubbing at all correct? One more qucikie..in my
    glove box there is the sticker that says what came stock
    well anyway it says i have locking differentials...now is
    this that gov lock thing? what oil should i use when i
    replace the gasket and what gears came with this option
    thanks!!!!
     
  2. RaisedK5

    RaisedK5 1/2 ton status

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    Location:
    Long Beach, CA
    I used to have that same setup, before i went bigger, and man let me tell you, if they didn't rub, they came really close, its hard for anyone to say for sure, it all depends on real tire size, my old ones were really wide for 12.50 maybe yours would clear, sag, flex, brand of lift, etc. As for the diff, my 75 came with the G80 Locking Diff, it is the Gov-loc, not the stoutest diff, regular gear oil, with the GM additive should do it. You can get the add. at teh dealer.

    RaisedK5

    "Friends don't let friends drive Fords"
     
  3. '73 K5

    '73 K5 1/2 ton status

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    Location:
    Kansas
    From my personal experience, the reason you should run 3 5/8 inches of backspacing isn't for the tires rubbing. Its to keep the rims from hitting the tie-rod ends. Thats what I always had the most trouble with.

    '73 K5
    Chevy good...Ford bad
     

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