A little late but just figured I would throw this out. Your RPM limit should be be between 6500 and 6700. I say this because any higher and your killing your acceleration and any lower and you are doing the same. Your shift points will be in that range I am guessing for optimum acceleration. Just remember this, the lower you shift, the slower you go, but the longer your engine will last. Me personally, I wouldn't hesitate to shift at 6600 all day long. Any higher and I would start saving for a shortblock.
96 v8 4.6 explorer, kooks headers, off road x, magnaflow mufflers, cl tb/plenum, lmaf, gt tube, xcal tune, alum shaft, 3800 dirty dog converter, darrin trans, 373 gears, hoosier slicks on fanblades, pbr brakes, Skinnies on front, No PS or AC, Aeromotive EWP, major weight removal (3380 LBS), 12.78 OLD COMBO.