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4wd Box to 2wd Box

Discussion in 'The Garage' started by stockk5, Oct 29, 2006.

  1. stockk5

    stockk5 1/2 ton status Premium Member

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    Hey guys, when you replace the 4wd steering box for the 2wd steering box what is involved with hooking up the power steering fluid lines? They all bolt in the same spot? do i have to bleed the system? and if so how do you do it? thanks!
     
  2. Chaddy

    Chaddy 1/2 ton status GMOTM Winner

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    As long as you have the same style box everything will just bolt up.
     
  3. sandawgk5

    sandawgk5 3/4 ton status

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    I did not even disconnect my box. I took the cap and shaft from the 2wd and put it in my 4wd box. Took all of aboot 10 minutes:D. You will have to bleed the system no matter how you do it. The only thing you have to look for is if the box has the same style fittings be it oring or flare. All connections are in the same location though.

    Ira
     
  4. makovai

    makovai 1/2 ton status

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    i dunno what your posed to do, but i just finished cross steer yesturday and it tok about a quart of PS fluid. It was pretty noisey at first but as i kept turning the wheels it quieted down, seems to be ok now. I didn't bleed anything like you would a brake system but i suppos since its a closed system it may need to be. However a ps pump doesn't have a sealed lid like a mastercylinder does, so it'll prolly be ok.
     
  5. Chaddy

    Chaddy 1/2 ton status GMOTM Winner

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    If you swap the sector shaft make sure you have the right 1 because there are 2 different styles.
     
  6. sandawgk5

    sandawgk5 3/4 ton status

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    OOps forgot to mention that. Just compare the "teeth" on the gear portion of the shaft. If they look the same they will interchange. The difference is obvious it has to do with the length of the center tooth.

    Ira
     
  7. stockk5

    stockk5 1/2 ton status Premium Member

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    alright thanks for the quick responses guys, but how do you bleed the ps system?
     
  8. sandawgk5

    sandawgk5 3/4 ton status

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    Put it on jack stands and turn the wheel lock to lock with the engine off for ~5 min. Check fluid level start the engine and repeat until the grinding noise stops. It will eventually works all of the air out. I did not get all of mine out at first but as I drove it it quited down.

    Ira
     
  9. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    quick hijack - what's the advantage of a 2wd steering box?
     
  10. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The engine needs to be running when bleeding the PS system.
     
  11. stockk5

    stockk5 1/2 ton status Premium Member

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    for crossover steering
     
  12. sandawgk5

    sandawgk5 3/4 ton status

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    Gotta have it to run crossover. The 2wd sector shaft is splined 360 with 4 indexing splines 90 deg apart. This allows you to put a pitman arm in the other than push pull position. The 4wd shaft is only splined on 180 and the pitman arm can only go on 1 way which is pushpull.

    Ira
     
  13. sandawgk5

    sandawgk5 3/4 ton status

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    Makes sense eh I was thinking of a killing the pump when low on fluid but if it is not running then no fluid to push the air out:doah:. Sorry

    Ira
     
  14. Txchevy18

    Txchevy18 1/2 ton status

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    He probbaly needs it for x-over steering. A 4wd drive has the pitman arm clocked so that it moves front to back. A 2wd drive box has a shaft the will clock it to move left to right. :o
     
  15. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    wait, so he needs it for x-over steering?....







    :wink1: it makes me smile when 14 people answer the same question the same way. :)
     
  16. sandawgk5

    sandawgk5 3/4 ton status

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    No fair I explained why in my post:D

    Ira
     
  17. Leper

    Leper 1/2 ton status

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    Along the same lines, I have a question. When you bolt the little cap back on(that is on top of the sector shaft), how tight does the nut need to be? Is it just a preload?
     
  18. sandawgk5

    sandawgk5 3/4 ton status

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    When you change the shaft change the cap and all. If you do anything with that nut you need to do the preload procedure or you can lock your steering as you go down the road:eek1:. That nut controls how close the sector shaft gear is to the worm gear if it is too close your steering will jam. I just unbolted the 4 bolts on top and swapped complete assemblies.

    Ira
     
  19. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    It depends on what you're doing and how much fluid you lose. When I did the crossover and hydro assist mod I just put the front on stands and cranked it back and forth until I thought my arms were gonna fall off. Fired it, squealed for a second or two, and then ran fine.
     
  20. JEBSR

    JEBSR 1/2 ton status

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    Actually if you start the engine while the system is low or has alot of air in it, it will cause the fluid to cavitate and cause the fluid to foam and take longer to bleed. the book says to get the wheels off the ground and turn from lock to lock. As you do watch the fluid level and replace as needed. Once the fluid level stops dropping then fire it up and try it out. That's not word for word obviously.
     

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