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Transmission will not shift to third and fourth when warm

Tiny
TNB13
  • MEMBER
  • 2002 JEEP GRAND CHEROKEE
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 216,000 MILES
I have the vehicle listed above it is supercharged h.O. Pos. When cold the transmission shifts through gears like normal. After I drive it for five minutes suddenly it will not shift out of second into third. While I can hear the engine sounds as if it is going to shift I do no't hear or feel the transmission do anything. If I go to fast the car will jerk a little as if I slammed my brakes (I do not drive it because of this. I was only testing it out after replacing the TPS. It is good on fluid and even put Lucas transmission treatment in it. What would you recommend doing?
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Friday, February 16th, 2018 AT 8:28 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

The first thing I would do is change the transmission oil and filter and add a can of valve body modifier and see if that takes care of it.

It could also be a failing seal or piston in one of the drums.

Roy
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Friday, February 16th, 2018 AT 9:31 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,207 POSTS
Hello,

This can be a shaft speed sensor. Can you run the codes to see what comes up?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Friday, February 16th, 2018 AT 10:19 AM

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