which rod? i lengthed the pedal rod and shortened the plunger rod, i also took a coil off the spool and put a harder return spring on the plunger cause i had problems with the brakes sticking on once in a while.
pedal rod was too short when i did mine,, i used astro hydro and stock master, had to grind the outer dia of master to fit in astro hole, shorten plunger rod and i sleeved pedal rod to correct length for pedal
here is how i did mine,i cut the astro rod,and cut the stock sy rod,went to lowes and bought a piece of pipe that just fit over the two,slid the pipe on ,then welded the two rods together then slid the pipe over the welded two rods and then welded that on both ends.
I just measured the length of the stock rod off the vacuum booster when I got it out and figured thats how long my hydroboost rod needed to be, I cut the two and welded the stock rod end to the hydroboost one per my measured length. I then took steel rod roughly the same size as the stock and hydroboost rod and welded it along the entire length for added strength.