The speed sensors are located on the electrical portion of the transmission valve body and are the most common cause of a no shift condition in our cars. The valve body is a two piece unit comprising of a metal block of passages and springs (which never really 'fail' but do get dirty) and an electrical portion (conductor plate) that houses the shift solenoids and the speed sensors. This unit snaps onto the 'metal portion' of the valve body and is located under the transmission pan.... There are multiple solenoids and two speed sensors... usually the speed sensors go due to a poor design, these cause codes and no shift issues. Unusual for the shift solenoids to go but they definitely can! All are located on the conductor plate... my advice if your opening the trans to change a solenoid is to search 722.6 Conductor plate on Ebay and pick up a whole new conductor plate... they sell for around $150-350 (or $700 at the dealer!). Change out the solenoids from your old one (obviously replacing the diagnosed bad one if any) and put it back together... new fluid and voila!
FRI'd Sidewinder, Novi 1200 S/C @ 5.5psi, Custom TR1235 A2A Intercooler, Ported SRT Headers & Gutted Mid's, EGR, MDS & 02 Delete, Custom Catback w/Blastin Bobs SRT Pipes 4" tips, 170 Tstat, Big Bully Catchcan, 3.06 diff, 2800 stall, MTCM, Tranzformer, SRT Rad, SRT P/S Cooler, 5/15% Tint, SRT 20's, SRT Spoiler & Bumpers, Custom Stainless Grill, SE Coilovers.
AMP'd, FRI'd and Blown... 422rwhp/463rwtq @ 5.5psi conservative street tune!