Trans help?

[TexasNomad]

93 Ford stang 5.0 auto trans, any idea of what would cause the trans not to drop in to Over Drive?
Checked the fluid and it was low and dirty, could that be it or some thing more sever?
Any input would be awesome thanks a ton.

 

[blacksnapon]

No 3-4 Upshift (Stays in Third Gear)
Throttle linkage —misadjusted/bent/sticking.
Adjust throttle linkage. Service as required.

Valve body bolts loose/too tight.
Check torque on valve body bolts. Tighten to 9-11 Nm (80-97 lb-in).

Direct clutch circuit leakage—Perform Direct Clutch Pressure Test to confirm.
Check for nicks or porosity in the case passages. (Valve body to case mating surface). Replace case for the above.

NOTE: Burnt direct clutch plates will help to confirm leakage in the direct clutch circuit. Replacing only the plates and not finding the cause will require repeat service.
Direct clutch piston check ball leaking. Perform check ball leakage procedure; found in cleaning and inspection portion. Replace piston if leakage confirmed.
Direct clutch
piston
seal rings (inner and outer) leaking. Replace.
Check the direct clutch output shaft seal rings (No. 5, No. 6). They should move freely on the output shaft. Check for metal shaving contamination or burrs between the seal and the output shaft. Replace as necessary.
Check the large seal rings on the output shaft for freedom of movement. Check for contamination such as metal shavings on the output shaft. Replace as necessary.
NOTE: The four large seal rings are numbered 7, 8, 9 and 10. Seal rings 7 and 8 (closest to the output shaft hub) are for the direct clutch. Seal rings 9 and 10 (closest to the governor) are for the governor.

Inspect the output shaft feed passages and the cup plug for leakage.

No 3-4 Upshift (Stays in Third Gear) Continued
Valve body contamination/sticking valves.
Clean the valve body. Check for sticking valves as follows:
Overdrive servo regulator valve; 3-4 shift valve; 3-4 TV modulator valve; orifice control valve. If any valves are sticking and they cannot be freed, replace valve body.

Main control gasket distortion.
Check if main control gasket is blocking an orifice. Replace gasket.

Case out-of-flat can cause sticking valve.
Reduce valve body bolt torque, tighten to minimum side of specification 9 Nm (80 lb-in).

Governor leakage.
Check last two large seal rings on the output shaft (No. 9 and No. 10). They should move freely. Check for metal shaving contamination or burrs between the seal and output shaft. Replace as necessary.
Check the seal ring bore at the rear of case for scoring. Light scoring is permissible. Deep grooving indicates case wear. Replace case for deep grooving.
Check the governor to output shaft retaining ring to make sure it is properly seated on the output shaft. Service as necessary.
Check the fit of the governor counterweight on the output shaft. If the fit is sloppy, replace the counterweight.

Harsh/Delayed 3-4 Upshift
TV linkage—misadjusted/high TV/cable bent/sticking. All shifts will be harsh/delayed.
Adjust linkage. Service as required

Valve body bolts—loose/too tight.
Tighten to 9-11 Nm (80-97 lb-in).

Valve body dirty/sticking valves.
Determine source of contamination. Service as required

Incorrect engine performance.
Tune/adjust engine as required.

 

[TexasNomad]

mans like some kinda Hippy God!!
thanks Boss man
I hope its just the linkage, if not it sounds expensive .

 

[blacksnapon]

mans like some kinda Hippy God!!
thanks Boss man
I hope its just the linkage, if not it sounds expensive .

Pocket change for a man of your means!