Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISCRUISE CONTROLTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSSPEED CONTROL - DIAGNOSTIC TIPSSPEED CONTROL PERFORMANCE - AOD, AXOD AND MTX5
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Speed Control Performance - AOD, AXOD and MTX5
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Speed Control Performance - AOD, AXOD and MTX5
As noted in the Owner's Guide, it may be preferable to shift the AOD or AXOD to the "D" (overdrive lockout) or the MTX5 to 4th gear in mountainous areas or at high altidude to improve speed control performance.
On steep upgrades the vehicle may not be able to maintain speed while in overdrive, or 5th gear, resulting in a speed drop below the set speed. If the speed drop exceeds approximately 10-13 MPH, the speed control will automatically disengage and must be reset with the SET/ACCEL button. Performance will be improved by shifting to "D" (AOD or AXOD) or to 4th (MTX5).
If speed control performance is poor on moderate grades, the adjustment of the Bowden cable/bead chain should be checked and readjusted if necessary. The automatic transmission shift linkage should also be checked for proper adjustment.
On steep upgrades the vehicle may not be able to maintain speed while in overdrive, or 5th gear, resulting in a speed drop below the set speed. If the speed drop exceeds approximately 10-13 MPH, the speed control will automatically disengage and must be reset with the SET/ACCEL button. Performance will be improved by shifting to "D" (AOD or AXOD) or to 4th (MTX5).
If speed control performance is poor on moderate grades, the adjustment of the Bowden cable/bead chain should be checked and readjusted if necessary. The automatic transmission shift linkage should also be checked for proper adjustment.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.