if you have manual steering already take out the old box put in the new job done
if you have power box you will need a steering column adapter
the power box is taller and has a different spline so you need a male/female spline adpater that fits the manual box and is long enough to reach the pot coupler or rag joint coupler on your current column steering shaft
you may or may not need a new pitman arm its unlikley but you might.
they made two thickensses of sector shaft for power boxes hence two pitman armn versions
Based on input from and feedback about PST here i think you made a good choice in supplier
in both cases
tie the steering wheel into position centrally
pull the pitman arm off
undo the pinch bolt or drive out pin at the coupler
undo the box mounting bolts
pull out the box
back in with a new box is dependent on where the master spline (double width) is on the box input spline
if its not in the same place or there isn't one you have a bit more work to do.
just put the box in with it centred ( check that one of the 4 master splines on the sector aligns with the case mid point casting line)
then twist the steering column to fit the pot coupler on
then adjust the position of the steering wheel
if no master spline you need a small grinder to take off the peak of 1 spline on the input to the box thus making 1 double width trench...
connect it up and adjust wheel 1 or 2 splines at the top to get it centred
Dave
I replaced my original manual box with PST's 20:1 in my 1969 GTS. I am happy with it. Better response than the old one but not too hard to turn.
I would buy another one. PST is easy to deal with, and we get a discount. Replacement was straight forward, might want to check/rebuild your coupler while you are at it.
