Clean the MLPS connector first.
Manual Lever Position Sensor (MLPS) Adjustment Info; "...back-probe the MLP line with a volt meter while in Park, and set it to between 4.277 and 4.736 volts (ideally at 4.5065V, right in the middle of the two limits). As a "double-check" afterward, pull the lever down to 1st gear, and again test the MLP voltage; it should be between 0.293 and 1.167 volts, ideally in the middle at 0.73V..."
Source: by SigEpBlue (Steve) at http://fullsizebronco.com/forum/showthread.php?t=40055
I don't have a 93 wiring diagram so, see & compare;
Manual Lever Position/Transmission Range (MLPS/TR) Sensor Wiring Diagram in a 94 from EVTM
Source: by Mikey350 at http://www.supermotors.net/registry/media/874093
Manual Lever Position/Transmission Range (MLPS/TR) Sensor Wiring Diagram in 92 Bronco & F Series
Source: by Chilton http://content.chiltonsonline.com/co...s/88286w26.pdf
& Solenoid Body Connector
Seating; "...Completely seat solenoid body connector into solenoid body assembly receptacle by pushing on the top of the connector. [b]An audible click indicates full contact. Verify connection by pulling on harness..."
NO 2-3 Upshift TSB 98-16-7 in 90-94 Bronco, Econoline, F-150, F-250, F-350, F-53
"...Some vehicles may exhibit a no 2-3 upshift condition. This may be the result of cross-leakage caused by distortion of the control valve body separating plate. Perform diagnosis and, if necessary, replace the control valve body separating plate. Refer to the following Service Pocedure for details. Perform diagnostics as outlined in the appropriate Service Manual. Refer to Figure 1 for the models affected. If condition still exists, remove the control valve body separating plate. Wipe excess oil. Examine the separating plate for deformation in the intermediate band servo area, Figure 2. THE SEPARATING PLATE GASKETS MUST BE REMOVED TO SEE THE DISTORTION. If distorted, replace the separating plate with a new Control Valve Body Separating Plate (F4TZ-7A008-A). Install new Separating Plate Gaskets (F4TZ-7C155-A and F4TZ-7D100-A) and a new Oil Pan Gasket (E9TZ-7A191-A)..." see site for figure
Source: by SeattleFSB (Seattle FSB) at SuperMotors.net