I have a five speed manual transmission in my 7.3 powerstroke. so the problem is a came to a stop aweek or so ago and she completly will not engage into first and second gear only!

tiger by the tail.!! no, 2 tigers (fignots)
no transmission maker /model told.
7 engines used world wide (no country told)
and 4 transmission used. world wide

• 5-speed FPT C510 manual,no
• 6-speed FPT C635 manual, no and
• 6-speed FPT C635 dual-clutch automatic
• 5-speed FPT C510 Dualogic automated
• 6-speed Aisin AW60T-6F25 automatic

or more wiki is not perfect, best is clearly state what transmission this is, Aisin is top maker in JAPAN. and best IMO:here..
all those words and not one EOBD PCM scans to see what the electronic transmission fails, really?

starting in 2nd gear on modern tranny smacks of transmission TCM locked into LIMP-HOME mode, and you ignoring vast PCM TCM DTC errors. buy a scan tool and use it.
the tool is free, ROI(econ) of near instant if 1 hour of labor saved the tool is free,same with service manual from fiat.

Transmission Codes

• U - automatic 4R70W-AOD
• M - five-speed manual overdrive
• D - automatic five-speed
• Item Description 1 Exterior paint code 2 Region code 3 Domestic special order code 4 Wheel base code 5 Brake code 6 Interior trim code 7 Tape/paint pinstripe code 8 Radio code 9 Axle code 10 Transmission code 11 Spring code

Do you know where to find this sticker ? Driver door or door jam .

You could try that first but it could also be a wiring problem.
Usually when the sensor fails your speedo stops working.

The idle air control solenoid is very common to quit working. The only other thing would be a large vacuum leak.

Every car I raised the hood on has a label with a belt diagram usually near the radiator or on the underside of the hood.

get the selector checked out

VIBRATION - DRIVELINE RESONANCE/VIBRATIONBETWEEN 1400 AND 2000 RPM WITH CONVERTER
Clutch ENGAGED DURING MEDIUM TO HEAVY
THROTTLE CONDITIONS - VEHICLES WITH 7.3L DI
TURBO ENGINE AND TRANSMISSION BUILT PRIOR
TO 11/13/95 (5L13)
^ TRANSMISSION - E40D - DRIVELINERESONANCE/VIBRATION BETWEEN 1400 AND 2000
RPM WITH CONVERTER
Clutch ENGAGED
DURING MEDIUM TO HEAVY THROTTLE
CONDITIONS - VEHICLES WITH 7.3L DI TURBO
ENGINE AND TRANSMISSION BUILT PRIOR TO
11/13/95 (5L13)

FORD:
1995-1996 E-350, F-250 CREW CAB, F-350 CREW CAB
Article 96-26-21 is being republished in its entirety as part of a consolidated 7.3L diagnostic aid booklet.
ISSUE
Some vehicles with transmissions built prior to 11/13/95 (5L13) may exhibit a driveline resonance/vibration between 1400 and 2000 RPM with the torque convertor engaged. This may be caused by the torque converter.
ACTION
Prior to torque converter replacement, refer to the following Service Procedure for details to verify conditions.
SERVICE PROCEDURE
1. Verify the resonance/vibration does not occur in neutral and is most noticeable between 1400 and 2000 RPM with the converter clutch engaged during medium to heavy throttle conditions. Also watch for the vibration to diminish at engine speeds lower than 1400 and higher than 2000 RPM. If the concern meets all of these conditions and the transmission has a built date prior to 11/13/95 (5L13), replace the torque converter. Refer to the appropriate Service Manual for removal and installation procedures.
2. If the vibration concerns do not meet the conditions, check for non-factory installed items that could affect driveline and verify proper installation. Also refer to the appropriate Service Manual, Section 05-00 for diagnosis and testing.

IF TRANSMISSION FLUID COLOR IS PINK FULL OF BUBBLES EITHER YOU HAVE TOO MUCH TRANSMISSION FLUID IN TRANSMISSION WHICH CAUSES IT TO CHURN THE FLUID. OR YOU HAVE AIR GETTING IN THE SYSTEM BUT IT SOUND LIKE TORQUE CONVERTER SOLENOID CIRCUIT OPEN NOT ALLOWING TRANSMISSION GO INTO OVER DRIVE.IF YOU SEE CHECK ENGINE LIGHT.BEST TO CODE SCAN VECHICLE TO SEE WHAT TROUBLE CODE YOU GETTING.BY TRANSMISSION BEING PCM CONTROLLED BEST TO SCAN BECAUSE TRANSMISSION HAS MANY SHIFT SOLENOIDS.TAKE CAR TO TRANSMISSION SHOP LET THEM CODE SCAN AND CHECK TRANSMISSION FLUID COLOR.NORMAL FLUID COLOR WOULD BE RED COLOR.

sounds like the return spring is worn or dislodged

Could be a solenoid in the tranny, or the throttle position sensor need calibrating.