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3/4 conversion and backspacing

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by **DONOTDELETE**, Aug 2, 2001.

    Ok, I've gathered that I'll need to grind the calipers on the front in order to keep 15" rims on the 3/4 conversion.
    I wanted the Chrome Modular Rock crawlers, adn ordered them but they only have a 3" back spacing and a 4 1/4.
    Right now before the converison I have a 4" backspacing and my balancing weights are a hair shy of hitting the tie-rod ends. So Im thinking the 4 1/4 are out the door.
    So back to the 3". Other than having a wider stance and having to cut the fenders a bit more for clearance of the 36's are there any other dis-advantages to having the 3" backspacing?
    Help me, I need to keep or return these thing asap.

    Damn I need to learn how to use my welder!!<img src="http://coloradok5.com/forums/images/icons/mad.gif">
    (90 Jimmy 350 TBI, 14 FF/10 bolt, 4.56, tires ??
    (ftn96)<P ID="edit"><FONT class="small">Edited by mud-weiser on 08/02/01 10:44 AM.</FONT></P>
     
  1. Somebody other than Rene!

    Damn I need to learn how to use my welder!![​IMG]
    (90 Jimmy 350 TBI, 14 FF/10 bolt, 4.56, tires ??
    (ftn96)
     
  2. You should have got a 1" back spacing!Then you could have put some 205 50's on it and road around Antioc and felt cool.
    LMAO
     
  3. Boss

    Boss 1/2 ton status Author

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    More stress on your balljoints, etc. And you lose some turning radius....
    Boss

    89' 1 TON of FUN K5
     
  4. Chad your warped man!!!!

    Ok, so how is it that I hear some of you running 4 1/4 backspacing and not hit the tie-rods?? If I can fit the 4 1/4 thats what I want. But I just dont see how it will work

    Damn I need to learn how to use my welder!![​IMG]
    (90 Jimmy 350 TBI, 14 FF/10 bolt, 4.56, tires ??
    (ftn96)
     
  5. RaisedK5

    RaisedK5 1/2 ton status

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    The 3/4 ton front end is, if i remember correctly, 2" wider flange to flange than the 1/2 ton, my 16x10s with 4.5 are right about the same place my 15x10s with 3 5/8 were before the swap. throw a rotor on the front and measure back to the tie rod, but i think you'll have more problems with the brake caliper fitting with 4.25 than the tie rod.

    Leland aka RaisedK5

    "Of all the things I've lost, I think I miss my mind the most!"
    "Are the voices in my head bothering you?
     
  6. Boss

    Boss 1/2 ton status Author

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    The D60 knuckles are different from the 10bolts and D44. I'm trying to remember off the top of my head, but I remember when I had a D44 and 35"s and standard backspacing, that my tierod almost hit the wheel, but the D60s are way different, doesn't even come close. It positions it away from that area kinda....am I making sense?? I just confused myself [​IMG]
    Boss


    89' 1 TON of FUN K5
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Hey Brandon, my Jimmy has the 3 5/8" backspaced 15x10's on it and my tierods are about an inch away from the rim...so 4 1/4 backspace could be done with more grinding...

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  8. Ok, so where can I find some cheap steel chrome wheels 15x10 with 3 5/8 backspacing 8lug?

    Damn I need to learn how to use my welder!![​IMG]
    (90 Jimmy 350 TBI, 14 FF/10 bolt, 4.56, tires ??
    (ftn96)
     
  9. Also, how much can you grind off the caliper before its considered unsafe? and what parts are you actually grinding on?

    Damn I need to learn how to use my welder!![​IMG]
    (90 Jimmy 350 TBI, 14 FF/10 bolt, 4.56, tires ??
    (ftn96)
     
  10. Pugsley

    Pugsley 1/2 ton status

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  11. Ok, here's what I did. My boss is gonna kill me but, I ordered bart wheels, (4)15x10 8 lug 3.5 backspacing chrome for 401.95 totals including shipping.

    Damn I need to learn how to use my welder!![​IMG]
    (90 Jimmy 350 TBI, 14 FF/10 bolt, 4.56, tires ??
    (ftn96)
     
  12. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>I have 4 1/8" backspacing and they dont hit the tie rod ends. </font color=blue>
     
  13. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Me too.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  14. Ok, so you do, but how much did you have to grind off off your calipers?

    Damn I need to learn how to use my welder!![​IMG]
    (90 Jimmy 350 TBI, 14 FF/10 bolt, 4.56, tires ??
    (ftn96)
     
  15. BigTex

    BigTex 1/2 ton status

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    I'm always concerned about this, too since I am shopping for wheels for my 3/4 ton conversion. The only ones I have found so far (w/in my price range) are $55.00 white wagon wheels from Pep Boys. I will paint them black but they "only" have a 3" backspacing. Is the difference vs a 4" backspacing really that noticeable???

    <a target="_blank" href=http://www.chriswhitley.com>www.chriswhitley.com</a>
     
  16. Well, your wheels are gonna stick out 1 inch further which with bigger tires thats gonna make the tiers rip right into the fenders.
    Also, it will decrease the turning radius, and it will put more stress on the ball-joints.

    I got my wheels from Summit. Bart Wheels, 15x10 chrome 3.5 backspacing at $98 each. They have black ones as well.

    Damn I need to learn how to use my welder!![​IMG]
    (90 Jimmy 350 TBI, 14 FF/10 bolt, 4.56, tires ??
    (ftn96)
     

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