[mtm_seven]

Instead of going hydro, I had the parts store order a booster from a 3/4 ton '72. It's a little different shape but bolts in the same and provides way better boost than the 1/2 ton one. That and going to rear disc on my blazer made the brakes feel like a sportscar. They work almost TOO well.

Originally Posted by trukman1

Duffy, One other thing to consider is that the factory 1-ton trucks came with hydro-boost brake systems instead of vacuum boost units. I found out why when I put my Dana 60 in my truck...the brakes SUCKED BAD!!! After swapping to the hydro-boost unit the brakes are better than ever. I purchased a junkyard unit for a core and put in rebuilt everything but could have just used a new MC and would have been OK. BTW, purchase '79 or older parts if you go the rebuilt route or else you'll have to swap your steering gearbox and PS pump to the O-ring type ports. (I learned that one the hard way). And there is a difference in the 3/4-ton and 1-ton hydro boost units so beware. Some of the guys I wheel with still have the old vacuum systems but their trucks are scary to stop! Just thought I'd let you know my experience with this conversion. Good Luck!