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RedRoad · 12-21-2017, 04:13 AM

Here is some info on an astro HB and early box.

http://67-72chevytrucks.com/vboard/s...d.php?t=523502

Either a mod to the line or change out the valve on the box to get it done.

12-21-2017, 04:13 AM	#5
RedRoad Registered User Join Date: Jan 2015 Location: Los Angeles California Posts: 927	Re: hydro boost interchangablity Here is some info on an astro HB and early box. http://67-72chevytrucks.com/vboard/s...d.php?t=523502 Either a mod to the line or change out the valve on the box to get it done.