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Ask Mike Kelly Your Own Question
Mike Kelly
Mike Kelly, Auto Mechanic
Category: Car
Satisfied Customers: 5470
Experience:  17 years experience as a auto mechanic,foreign and domestic.5 years running my own repair business.
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2003 saab: auto trans..trans will slip between shifts 2..10 minutes

Customer Question

i have a 2003 saab 9.3 auto trans with 110,000. when the car is cold the trans will slip between shifts 2-3 gear, after about 10 minutes its fine for the rest of the day
Submitted: 7 years ago.
Category: Car
Expert:  Mike Kelly replied 7 years ago.
Hi,how are you?Is the check engine light on?Have you tried anything yet?
Customer: replied 7 years ago.
light is off .changed the tranny fluid still the same
Expert:  Mike Kelly replied 7 years ago.

Hi,what this sounds like is the start of a failing speed sensor,from your description.

The speed sensors are integrated in the wheel hub.

Customer: replied 7 years ago.
can it be replaced, or do you have to rebuild the tranny
Expert:  Mike Kelly replied 7 years ago.
Yes they can be replaced without replacing or rebuilding the transmission.

Removal & Installation

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove or disconnect the following:

    Hub nut, loosen only Front wheel Hub nut Wheel speed sensor Brake caliper Rotor and backing plate Tie rod end from the knuckle Sway bar from the lower control arm Ball joint out Three upper strut mounting bolts Strut housing
  3. Press the hub from the wheel bearing.
  4. Remove the 2 circlips on each side of the wheel bearing.
  5. Press out the wheel bearing.

To install:

  1. Install one circlip and press in wheel bearing until it contacts the circlip. Be sure the press tool contacts only the outer bearing race.
  2. Install the other circlip.
  3. Clean the bearing surface of the hub on a wire wheel. If the hub is pitted or damaged, it should be replaced.
  4. Support the inner bearing race and press hub into wheel bearing. If the inner race is not properly supported, the bearing will fail quickly.
  5. Install or connect the following:

    Strut assembly and torque the upper mounting bolts 13 ft. lbs. (18 Nm) Ball joint and a new self locking nut and torque the nut to 55 ft. lbs. (75 Nm) Tie rod end Sway bar and torque at the lower control arm link to 89 inch lbs. (10 Nm) Backing plate and rotor Caliper Wheel sensor Hub nut. Do not tighten. Wheel
  6. With all 4 wheels on the ground torque the hub nut to 215 ft. lbs. (290 Nm).
  7. Pump the brake pedal to position the brake caliper piston.
    CAUTION Do not attempt to move the vehicle until a firm pedal is obtained.
  8. Check front wheel alignment.
Customer: replied 7 years ago.
Why would a wheel speed sensor make my tranny slip when its cold, an not when its hot ?
Expert:  Mike Kelly replied 7 years ago.
This is do to the sensor still operating,just starting to go bad,the end result is the check engine light will come on and the tranny will do this all the time cold or hot.

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