An on-the-car-adjustable PHB is the one that can "un-adjust" itself if it loosens. An off-car adjustable one can rattle a bit if it loosens, but can't slip its adjustment nearly enough to notice. The only possible downside to an off-car adjustable one is that it only adjusts in half-turn increments - which once set is unlikely to ever be "off" by enough to matter at all for anything short of the fussiest appearance critique.
Re-adjusting with the car on drive-up ramps will affect axle positioning by a very small amount, probably not by enough to notice. But I'd suggest using the lowest ramps that still let you get under and adjust (even if you have to make them up from 2 x 10's), or that you intentionally offset the axle a really tiny bit toward the passenger side unless you're lowered. "A really tiny bit" is 1/32" or less.
I hope that you did not use high strength Locktite (the red stuff). If you did, you'll need to heat the Locktited joint.
'08 GT/5MT (mine)
'10 Subaru Legacy 2.5GT/6MT (hers)
'01 Maxima 20AE/5MT (spare, my occasional winter driver)
'95 626/V6/5MT (still in the family but not at this address)
Last edited by Norm Peterson; 07-05-2013 at 08:29 AM.