It is very simple install and requires no mods or cutting. Take the complete 71-2 3/4T DB booser, brackets, rod, MC, prop valve---hook up your two lines to the prop valve---install it and run it. Don't mix or shim other parts. The rod will hook right up to your pedal. The pedal on PB hangs lower in the cab...that is normal and correct.
If you go to rear DB in the future, you will need a different prop valve.
The pictured Corvette style MC, prop valve set is made to work with both 1/2T or 3/4T boosters. It has a machined safe engineered insert for the two depths.
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