Sonnax 2nd Gear super hold servo kit 22301B-01K is the largest and most leak-free servo available for Chrysler 46RH/RE, 47RH/RE, 48RE and A727 units. It reduces the need for aggressive lever ratios, excessively high line pressure and other radical modifications to achieve firmer shifts. Sonnax's exclusive servo design features rubber and PTFE seals that enhance positive sealing and prevent case wear. The overall result is more holding force in 2nd, firmer 1-2 shifts and 2-3 shifts that become firmer under load.
For information related to shift timing/overlap, see instructions.