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What steering box to use?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by 2quicK5, Jul 5, 2001.

  1. 2quicK5

    2quicK5 Registered Member

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    I am planning to replace my worn out original steering box and was wondering what is the best steering box swap. Is there a late model box that I can get out of a junkyard that will fit with minimal mods to the frame? What do most people use instead of the stock box?

    John

    1972 K5 Blazer: 400 ci, 4 sp, 4" springs, 35" Tires

    2000 Trans Am, A4
    11.97@114 mph
     
  2. Burt4x4

    Burt4x4 3/4 ton status

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    I looked into this and found this web site http://www.geocities.com/baja/5099
     
  3. Steve_Chin

    Steve_Chin 1/2 ton status

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    The AGR box is basically a detailed, plated, and blueprinted stock box. There's nothing really special about it that I know of. It has the same ratio as stock. I'd go Burt4x4's route and get a rebuilt stocker...
     
  4. 2quicK5

    2quicK5 Registered Member

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    I'll probably get a rebuilt box from my local AutoZone. They quoted me $159. Thanks for the advice guys! :)

    John

    1972 K5 Blazer: 400 ci, 4 sp, 4" springs, 35" Tires

    2000 Trans Am, A4
    11.97@114 mph
     
  5. Burt4x4

    Burt4x4 3/4 ton status

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    AutoZone??? hmmmmm, duno if I would shop there?? Kinda like buying a cheep pair of jeans when you really wanted a pair of 501s.
    just my .02c

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <A target="_blank" HREF=http://www.geocities.com/baja/5099>http://www.geocities.com/baja/5099</A>
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Autozone is the greatest autoparts store in exitstance. Mine anyway. Those guys really help me out, while the guy at Napa is a real prick.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  7. Triaged

    Triaged 1/2 ton status

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    That might be true but the parts they sell suck IMHO.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
     
  8. NuBombs72K5

    NuBombs72K5 1/2 ton status

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    Ditto. I've worked at both and there is little doubt that NAPA's rebuilt parts are of a higher quality. It will probably come with a waranty from autozone, but how many times do you want to do the same job. My $0.02.
     
  9. JST12

    JST12 1/2 ton status

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    According to the specs the AGR box that I have has a variable 13:1 - 17:1 ratio. I believe the stock box is 24:1.
    JT
     
  10. Steve_Chin

    Steve_Chin 1/2 ton status

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    Interesting. When I was talking to the guy at AGR, he said that the ratio was the same as stock. A friend also has an AGR box and his Blazer's steering input isn't any different than it was originally.
     
  11. 71RestoRod

    71RestoRod 1/2 ton status

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    According to the AGR web site, they have two different boxes... the SB1 is a fixed 16:1 ratio and the SB2 has a variable 17:1 to 13:1. Steve, do you know which one your friend has? I too am shopping for a new box and the SB2 looks attractive, but why spend the money if it's not worth it...
     
  12. greatwhite

    greatwhite Registered Member

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    this is an interesting, i have recently purchased a 72, blazer and checked everything in the steering componects and felt
    (as the last owner did) that the stock steering box is too quick on the freeway. is that a characteristic you guys just deal with?
     
  13. JST12

    JST12 1/2 ton status

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    My problem was that the old box took too much steering wheel travel on the highway to keep going straight. A lower ratio means less steering wheel movement needed to correct direction.

    Steve, I have several steering boxes at home from different year trucks (71,79,AGR). I can check the ratios to verify the AGR info. I'll post results.

    JT
     
  14. JST12

    JST12 1/2 ton status

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    OK my friends, here is the scoop. I took the boxes and measured the range of rotation of the output shaft. In all cases it was 90 degrees. I then turned the input shafts lock to lock and counted rotation and got this:

    1971 stock box = approx 4.25 rotations lock to lock
    AGR SB2 = approx 3.1 rotations lock to lock

    If you mulitply by 4 (90 degrees output shaft x 4 = 360 degrees or one revolution of output shaft), you get ratios of 17:1 for the stock box and 12.4:1 for AGR. Neither of these match up to published ratios for these boxes, so I am willing to agree there is more to figuring the ratio than this. But in any case, the AGR has a 30% lower ratio than the stock 1971 unit.
    JT
     
  15. 71RestoRod

    71RestoRod 1/2 ton status

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    Thanks for the AGR info. By the way, you guys should go visit Jeff's web site if you haven't already. That's one awesome restoration! Let me make it easy...

    <A target="_blank" HREF=http://www.jt-k5.rockcrawler.com/photo.html>http://www.jt-k5.rockcrawler.com/photo.html</A>
     
  16. JST12

    JST12 1/2 ton status

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    Thanks for the compliment. I need to make some time to add to the site with updated photos . Should be posted soon. See ya! JT
     
  17. Steve_Chin

    Steve_Chin 1/2 ton status

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    71RestoRod, sorry I don't know which box he has. I thought that they only had the one model for the Blazers (their tech guys never mentioned anything about a faster ratio, and I specifically was asking about a faster ratio box because the stock box is frustratingly slow).
     

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