The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 55.2-59 58 GMC Suburban NAPCO and Chevrolet 3166

mr48chev · 04-19-2021, 10:35 PM

The control valve on the pitman arm and power assist cylinder work the same as those on many Fords including at least 65 66 Mustangs and a number of late 50's early 60's chevys.

The sensor controls the pressure the cylinder puts out and controls the direction that it pushes or pulls. You absolutely don't want to rebuild one and get the adjustment of or it is an all day fight to get it right. I've done about three in my life an the first one wanted to make turns one way or the other on it's own when I got it back together and it took a lot of effort to get it adjusted right. No internet to run to to get an answer and if the shop manual you had was somewhat vague you had to go to the dealer and ask to see their shop manual .

04-19-2021, 10:35 PM	#7
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,287	Re: 58 GMC Suburban NAPCO and Chevrolet 3166 The control valve on the pitman arm and power assist cylinder work the same as those on many Fords including at least 65 66 Mustangs and a number of late 50's early 60's chevys. The sensor controls the pressure the cylinder puts out and controls the direction that it pushes or pulls. You absolutely don't want to rebuild one and get the adjustment of or it is an all day fight to get it right. I've done about three in my life an the first one wanted to make turns one way or the other on it's own when I got it back together and it took a lot of effort to get it adjusted right. No internet to run to to get an answer and if the shop manual you had was somewhat vague you had to go to the dealer and ask to see their shop manual . __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.