Lowering the pivot point wouldn't be very wise or easy, you would have to reinforce the area where the new pivot point would be located. There are products available that attatch to the belt to lower the shoulder strap for shorter people. You should be able to find them at the dealer or a local parts store.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed