ANYONE OUT THERE?....know much about vss?

[SRMUNKY]

91 auto 240sx s1391 auto sr20det s13Engine reads code 55 no prob.transmission reads code 2 speed sensor.voltage @ both are the same 8-10V. (when coasting @ 2-4mph)should be 0-5V i think. (when coasting @ 2-4mph)Speedo works perfect.car runs mint but shifts way late haven't pushed to see 4th yet.60mph/3500rpm sucks, OD is almost non existant.read something about s13 vs. s14 speed sensor voltages being diff.but every case had a speedo problem. 1. could i have been sold an s13 transmission with an s14 speed sensor and have no speedo problems? 2. could there be a short from the speedo to the control units that causes more voltage?3. the car is canadian and has both km/h and mph on the speedo, mean anything?4. Can someone please help me fast, cuz its not snowing here for till after christmas due to global warming and i might be able to get some sweet cool temp driving in b4 the white stuff hits...