78 wagon booster

[Bc409]

Need to replace brake booster. Is the 1975 j20 booster correct to upgrade to dual diaphragm? Can I reuse my original master cyl? Is it bolt in or mods required? Thanks

[rang-a-stang]

I bolted the master cylinder from my 79 Cherokee onto a dual diaphragm I got from another member. I also swapped the aluminum spacer from my 79 to the dual and used the 79's rod. I had to adjust the brake light switch though.