1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Steering Box Compatibility

Discussion in 'Suspension, Steering & Brakes' started by Doppleganger, Aug 14, 2020.

  1. Doppleganger

    Doppleganger Supporting Member Supporting Member

    Posts:
    2,085
    Likes Received:
    4,855
    Joined:
    May 24, 2019
    Location:
    OH-MI: Just like it sounds
    First Name:
    Chris
    Truck Year:
    1985
    Truck Model:
    K20
    Engine Size:
    5.7
    My truck has an 85 steering box. Motor is a 97 with all the accessories from 97...including PS pump.

    Are they compatible? Maybe custom hoses needed?

    Thanks.
     
  2. PrairieDrifter

    PrairieDrifter Full Access Member

    Posts:
    1,586
    Likes Received:
    764
    Joined:
    Dec 28, 2014
    Location:
    North Dakota
    First Name:
    Mason
    Truck Year:
    84,79,77,70,48
    Truck Model:
    Suburban k10, bonanza k10, c30 C&C, c10, gmc 1/2ton
    Engine Size:
    350, 350, 350, 350, 350
    I believe you would need custom hoses.
     
    Doppleganger likes this.
  3. 75gmck25

    75gmck25 Full Access Member

    Posts:
    984
    Likes Received:
    588
    Joined:
    Oct 13, 2016
    Location:
    VA
    First Name:
    Bruce
    Truck Year:
    1975
    Truck Model:
    K25 Camper Special TH350 NP203
    Engine Size:
    5.7
    I think that by ‘85 GM was using o-ring fittings on truck steering boxes. Old ones were inverted flare on the steering box hoses (up until about ‘78). If they are the same size as the newer truck, I think they will work.

    Bruce
     
    Doppleganger likes this.
  4. bucket

    bucket Super Moderator Staff Member

    Age:
    38
    Posts:
    22,164
    Likes Received:
    8,007
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    Fittings will be the same, as far as the steering box is concerned. Fittings will be the same on the pump too, but iirc, the placement is different on a '97. If so, '97 lines should work fine on an '85.
     
    WFO and Doppleganger like this.
  5. Doppleganger

    Doppleganger Supporting Member Supporting Member

    Posts:
    2,085
    Likes Received:
    4,855
    Joined:
    May 24, 2019
    Location:
    OH-MI: Just like it sounds
    First Name:
    Chris
    Truck Year:
    1985
    Truck Model:
    K20
    Engine Size:
    5.7
    Thanks fellas. I had read something awhile back about them being non-compatible (metric vs SAE?) or something like that.
     
  6. bucket

    bucket Super Moderator Staff Member

    Age:
    38
    Posts:
    22,164
    Likes Received:
    8,007
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    The fittings went metric right around '79.
     
  7. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

    Age:
    22
    Posts:
    3,173
    Likes Received:
    1,763
    Joined:
    Sep 8, 2019
    Location:
    Northern Wisconsin
    First Name:
    Taylor
    Truck Year:
    1978, 1980
    Truck Model:
    K10, K25
    Engine Size:
    400(?), 350
    various things went metric at different years sadly... wish there was a clean cut off
     
  8. WFO

    WFO Full Access Member

    Posts:
    1,708
    Likes Received:
    1,479
    Joined:
    Jan 6, 2017
    Location:
    Texas Panhandle
    First Name:
    Dan
    Truck Year:
    1986
    Truck Model:
    K20
    Engine Size:
    350
    I think so too.
    I put a 96 Jeep Grand Cherokee steering box on my 69 Chevelle, because it has a quicker ratio and is a direct bolt-up, except it took a different rag joint. Instead of getting a custom bastard pressure hose, I used an 80 Monte Carlo pump and an 81 Camaro hose.
     
  9. bucket

    bucket Super Moderator Staff Member

    Age:
    38
    Posts:
    22,164
    Likes Received:
    8,007
    Joined:
    Aug 3, 2010
    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    I can never remember the specific year for the trucks and I don't remember what my '79 truck uses. But some GM stuff still retained the SAE fittings in '79.
     

Share This Page