quick question.....in your signature, it says you have a '91 with a five speed? If that's the case, then you don't have a low/reverse servo. is this for a different ex?
('91 XLT, 5 spd, FW D44, FW 8.8, 5.13s, 36x12.50x16.5 Goodyear Wrangler RT-II (Military OZ).)