hey...kind of concerned...sometimes if i take off and get around 5000 rpm i get like a kickback when in between shifts...i think its like my gears shifting real hard not sure any insight?
it could be just shifting harder due to higher line pressure, the higher you rev, the more pressure there is in the valve body. You should definitely notice it if you rev the motor hard, and have the pedal to the floor. the lighter you are on the gas pedal, the slower and smoother the shifts will be.
If you were to install a shift kit, it would feel like that all the time.
It will also shift harder on very cold days, cooler trannys have firmer shifts, due to the fluid being a bit less viscous at lower temps.
Of course, if it makes you nervous, double-check your tranny fluid levels. your torque convertor may not be locking/unlocking properly if the levels are low. Also, if the fluid is burnt (brownish in color and smells like ass) you should flush and refill the tranny with fresh fluid.
As for OD, just leave it on most of the time, unless towing or driving over steep hills. turning off OD can give you some nice engine braking (deceleration via the drivetrain alone)
Actually, smooth, sloppy shifts create more wear on the autos. firming up the shifts will improve acceleratin, and reduce wear, of course, you also compromise comfort in the process, but that's the price you pay for performance.
Hope this helps