Senior Tech Team
Join Date: Sep 2000
Location: Walnut Creek, CA
Re: Jeep box upgrade-PICS-and then some...
Originally Posted by sglide View Post
Recently, I read an article on the Jeep swap-over and it mentioned that you have to change the pressure valve in the stock GM PS pump to the higher pressure valve. However, I don't remember ever reading that in any of the forums. Can someone shine a light on this for me? When you swap over to the Jeep box and you use the original PS pump, did anyone change the pressure valve in the pump to the higher pressure valve? Or, did the stock pump work OK with just the hose change-over? Thanks!
The pressure valve is set to 950psi in pre-1970 cars, 1450psi in '70 and up, according to Jim Shea. If you've got a '70 or later car, you're fine, if not, you've got to take the pressure valve from the donor car, which is the fitting the pressure hose threads into on the back of the pump - it just unscrews. As an added bonus, a later pressure valve will have the later O-ring seal, but the pump end will be the same and will thread into your existing pump.
I found this WAY back in the beginning of this 52 page post and it got me thinking.
The PS pump on my LFX V6 is rated for 1.7-2.1 GPM @ 1633-1754 PSI. Same as an LS mounted pump.
Will this higher pressure make the steering feel “over assisted”? I already swapped to a 12:1 Saginaw 800 box and while it turns quicker it still feels overly assisted. I did a similar Saginaw 800 swap in a 67 and it felt way stiffer.
66 Chevelle hardtop - LFX 3.6 liter 4 Cam V6/6L50 6 speed auto trans, 3.07 10 bolt, full Hotchkis suspension, Wilwood 4 wheel discs, white with red interior, cowl hood.