545RFE-Any changes? - JeepForum.com
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post #1 of 5 Old 04-10-2008, 05:08 PM Thread Starter
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545RFE-Any changes?

I have a 2006/Grand Cherokee with the 545RFE auto.When I set the cruise control to 60 mph and then speed up to 70 going down a hill as it decends to 60 mph the tach jumps up to 2500-3000 rpm.I was told that the tranny is down shifting from 5th-4th gear.Could this be true?Also have there been any changes in this auto tranny from 2005 up till now?Thanks Joe

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post #2 of 5 Old 04-10-2008, 09:26 PM
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So you're accellerating to 70 on the downhill then letting off the gas? Sounds like the cruise control doing it's job by keeping you at 60mph.

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post #3 of 5 Old 04-11-2008, 07:12 AM
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Even without touching the "go" pedal, a steep grade will bring the vehicle speed high enough to trigger a downshift. My old WJ did this as well. It's a neat feature for keeping the vehicle in check; though I wonder how this could negatively affect the transmission and engine mounts.
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post #4 of 5 Old 04-11-2008, 08:17 AM
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Just a question or query

I was under the impression that the ABS was to keep the cruise control to the correct speed on down hill runs
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post #5 of 5 Old 04-11-2008, 08:45 AM
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Originally Posted by cherren View Post
I was under the impression that the ABS was to keep the cruise control to the correct speed on down hill runs

ABS would be brakes and brakes would cancel the Cruise Control. It IS downshifting, that's all.

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