Transmission hard shifts into second gear

Tiny
PAUL K GENARIE
  • MEMBER
  • 1994 FORD BRONCO
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
Always had a hard shift into second gear. Now odometer and speedometer don't work. Replace speed sensor on rear and speed gauge.
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Wednesday, March 10th, 2021 AT 6:02 PM

1 Reply

Tiny
ROY B
  • EXPERT
Good morning,

The rear ABS sensor is the speedometer control as well. It sends a signal to the ABS module which sends a signal to the dash for speedometer. It also sends a signal to the transmission.

https://www.2carpros.com/articles/how-to-replace-a-abs-controller

This is most likely the reason the shifting is hard. Without a speedometer signal, it will not shift smoothly.

Roy

The four wheel Antilock brake system control module is located in the LH front corner of the engine compartment behind the driver's side head lamp on a bracket mounted on the surface of the plastic fender apron.
REMOVAL

1. Disconnect negative battery cable.

NOTE: When the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the Powertrain Control Module (PCM) relearns its adaptive strategy. The vehicle may need to be driven 10 miles or more to relearn the strategy.

2. Locate ECU at left front fender apron. Disconnect 40-pin connector from ECU.

3. Remove screws retaining ECU to mounting bracket.

4. Gently slide ECU along bracket and remove ECU.

INSTALLATION

1. Insert rivet into large hole portion of teardrop. Gently slide ECU along bracket to engage rivet.

2. Install retaining screw and tighten to 7-9 Nm (5.2-6.6 ft lb).

3. Connect 40-pin connector and tighten bolt to 5.2-7.2 Nm (3.9-5.3 ft lb).

4. Connect negative battery cable.
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Friday, March 12th, 2021 AT 4:27 AM

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