Power Steering Control Valve same as 63-82 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nate003 · 03-09-2006, 02:42 AM

I called Melrose T-Top International, who specializes in corvette parts. I heard in another thread that this is the same power steering control valve as the 67 power steering on our trucks. The guy that answered said that it isn't the same and he wouldn't let me send mine in as a core, and he wouldn't want me to install one and have it fail on me. He said to jack the truck up and move the wheels back and forth by hand and that will show me where the problem is, cus i don't know how to tell if the PSCV is even bad or not. I've been turning the steering wheel back and forth in the play, which is extremely excessive. What do you guys think?

**Bob B.** · 03-09-2006, 10:59 PM

Did he happen to mention what is different between a Corvette control valve and a truck one? NAPA lists the same control valve for '65 Chevy pickups and '79 Corvettes (NSP 526623). As far as your excessive play is concerned, you basically have to check everything, tie rod ends, idler arm, ball joints, wheel bearings, and steering box. There should be some play in the control valve where the Pitman arm attaches to it, but not too much. Does the power steering work? If the control valve is bad, sometimes you only have assist in one direction, it might be stronger in one direction, or it leaks. Also, an out-of-adjustment control valve can cause the truck to pull to the right or left.

Nate003 · 03-10-2006, 08:47 PM

he didn't say what the differance was. they look exactly the same to me. My power steering works, and my truck doesn't pull, but i just have play from about 10 o' clock to 2 o' clock and after having someone turn the steering wheel back and forth in the play the only thing that was moving was the power steering control valve. I'll have to hook the power steering control valve back up and do some more investigating.

**john** · 03-10-2006, 08:54 PM

Nate dont forget if you check the play with the engine off you will get alot more play in the valve than with it running. The valve wont use full travel running under normal driving conditions. If it does then it is probably too loose. John

76bonanza · 03-10-2006, 10:43 PM

Mine pulls to the right how can I tell if mine is adjusted right? Also when you say control valve is it the same as the gear box?

**Bob B.** · 03-11-2006, 04:51 AM

The control valve is not the same as the gear box. What is being discussed here is the type of power steering system that uses a hydraulic cylinder mounted on the steering center link, with a control valve where the Pitman arm attaches to the center link. It was used until mid-'68 on trucks, but was also used on Corvettes until '82.

76bonanza · 03-11-2006, 09:13 AM

thanks bob for the clarification.

03-09-2006, 02:42 AM	#1
Nate003 Registered User Join Date: Oct 2002 Location: Bremerton Wa Posts: 124	Power Steering Control Valve same as 63-82 I called Melrose T-Top International, who specializes in corvette parts. I heard in another thread that this is the same power steering control valve as the 67 power steering on our trucks. The guy that answered said that it isn't the same and he wouldn't let me send mine in as a core, and he wouldn't want me to install one and have it fail on me. He said to jack the truck up and move the wheels back and forth by hand and that will show me where the problem is, cus i don't know how to tell if the PSCV is even bad or not. I've been turning the steering wheel back and forth in the play, which is extremely excessive. What do you guys think?

03-09-2006, 10:59 PM	#2
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,321	Re: Power Steering Control Valve same as 63-82 Did he happen to mention what is different between a Corvette control valve and a truck one? NAPA lists the same control valve for '65 Chevy pickups and '79 Corvettes (NSP 526623). As far as your excessive play is concerned, you basically have to check everything, tie rod ends, idler arm, ball joints, wheel bearings, and steering box. There should be some play in the control valve where the Pitman arm attaches to it, but not too much. Does the power steering work? If the control valve is bad, sometimes you only have assist in one direction, it might be stronger in one direction, or it leaks. Also, an out-of-adjustment control valve can cause the truck to pull to the right or left. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

03-10-2006, 08:47 PM	#3
Nate003 Registered User Join Date: Oct 2002 Location: Bremerton Wa Posts: 124	Re: Power Steering Control Valve same as 63-82 he didn't say what the differance was. they look exactly the same to me. My power steering works, and my truck doesn't pull, but i just have play from about 10 o' clock to 2 o' clock and after having someone turn the steering wheel back and forth in the play the only thing that was moving was the power steering control valve. I'll have to hook the power steering control valve back up and do some more investigating.

03-10-2006, 08:54 PM	#4
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Power Steering Control Valve same as 63-82 Nate dont forget if you check the play with the engine off you will get alot more play in the valve than with it running. The valve wont use full travel running under normal driving conditions. If it does then it is probably too loose. John __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/ Last edited by john; 03-10-2006 at 08:55 PM.

03-10-2006, 10:43 PM	#5
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Re: Power Steering Control Valve same as 63-82 Mine pulls to the right how can I tell if mine is adjusted right? Also when you say control valve is it the same as the gear box? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

03-11-2006, 04:51 AM	#6
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,321	Re: Power Steering Control Valve same as 63-82 The control valve is not the same as the gear box. What is being discussed here is the type of power steering system that uses a hydraulic cylinder mounted on the steering center link, with a control valve where the Pitman arm attaches to the center link. It was used until mid-'68 on trucks, but was also used on Corvettes until '82. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

03-11-2006, 09:13 AM	#7
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Re: Power Steering Control Valve same as 63-82 thanks bob for the clarification. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO



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