# 04 Grand Cherokee, Transmission

**URL:** <https://community.cartalk.com/t/04-grand-cherokee-transmission/9433>\
**Category:** Maintenance/Repairs\
**Created:** [January 15, 2008, 12:26am UTC](https://community.cartalk.com/t/04-grand-cherokee-transmission/9433 "2008-01-15T00:26:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ranger333v](https://avatars.discourse-cdn.com/v4/letter/r/4bbf92/32.png) [@ranger333v](https://community.cartalk.com/u/ranger333v)\
**Post date:** [January 15, 2008, 12:26am UTC](https://community.cartalk.com/t/04-grand-cherokee-transmission/9433/1 "2008-01-15T00:26:27Z")

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I noticed with the colder temperatures my Jeep won’t shift into 5th gear until the transmission warms up, (about 5 minutes of interstate driving). It is an automatic (545RRFE). Also no codes, fuild changed about 3 months ago, and 75,000 miles on Jeep. Is this normal?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [January 15, 2008, 1:17am UTC](https://community.cartalk.com/t/04-grand-cherokee-transmission/9433/2 "2008-01-15T01:17:07Z")

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Yes. This is normal.

The drivetrain management system monitors both the engine coolant temp and the transmission fluid temp. Until both systems reach a certain temperature, the transmission will fail to shift into lock-up in the torque converter. This is done so the engine reaches the operating temperature faster, thereby reducing emissions.

Tester

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**Author:** ![ranger333v](https://avatars.discourse-cdn.com/v4/letter/r/4bbf92/32.png) [@ranger333v](https://community.cartalk.com/u/ranger333v)\
**Post date:** [January 15, 2008, 1:26am UTC](https://community.cartalk.com/t/04-grand-cherokee-transmission/9433/3 "2008-01-15T01:26:58Z")

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Thank you