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Old 07-12-2008, 12:28 AM   #1
ERASER5
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Variable Ratio Power Steering

Does anyone know what year they started making the variable ratio power steering box for trucks, burbs, or blazers?

I am planning to go junk.. uhh salvage yard shopping tomorrow or Monday and I need to know what to look for.
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Old 07-12-2008, 09:10 AM   #2
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Re: Variable Ratio Power Steering

Try this link, Rg

http://67-72chevytrucks.com/vboard/s...power+steering
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Old 07-12-2008, 09:28 AM   #3
stllookn
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Re: Variable Ratio Power Steering

Read the link...so it might be the spring in the steering pump valve. How about quick ratio steering? I heard you could modify or retrofit with a JY quick ratio steering box...anyone done that?

I found a link to a company in AZ that will do yours for $170 but I recall Bob Moore (RIP) talking about buying auto parts store components (Camaro?) and rebuilding them.
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Old 07-12-2008, 09:37 AM   #4
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Re: Variable Ratio Power Steering

I read it as the spring may affect "roadfeel" or the rate of assist. The 73-82 variable ratio box will give a quicker ratio than the original 68-72 box.

Sounds like the 73-75 boxes MAY use the same hoses as our trucks, but I do not know for sure...

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Old 07-12-2008, 10:53 AM   #5
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Re: Variable Ratio Power Steering

I used one out of a 1977 chevy truck. Bolted right in. The only reason I chose that year was because that was the best looking one at the junk yard.
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Old 07-12-2008, 10:58 AM   #6
caminokid
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Re: Variable Ratio Power Steering

I used one out of my old 87...I used the pump too. No problem with hoses then.
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Old 07-12-2008, 01:13 PM   #7
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Re: Variable Ratio Power Steering

Thanks for the help. So it seem that 73 & up is the answer.

I picked up Petersen's 4Wheel & Off-Road September issue. They have power steering/ram assist/hydro brake assist article. Good info, but they did not give any build dates.

Each piece was rebuilt. For the steering box, they showed variable piston and the straight cut piston. Big difference! Also, according to the article, the "road feel" is determined by the "torsion bar" shaft. This bar is the coupler from the steering wheel to the sector shaft. Apparently there are many different spring rates.
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Old 07-12-2008, 05:26 PM   #8
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Re: Variable Ratio Power Steering

I bought a quick ratio box for my 67. It works great for around town but going over 65 can be a little sketchy the first time as it's too sensitive ( I don't plan on any trips with gas prices as they are).

When everything is else is done I may get around to putting a variable rate one in.
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