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
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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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.
Originally Posted by cherren View Post
ABS would be brakes and brakes would cancel the Cruise Control. It IS downshifting, that's all.
Traded in on 2012 Hyundai Azera: 2007 Grand Cherokee Laredo, Rocky Mountain Edition, Bright Silver, 4.7L V-8, factory hitch and tow hooks, Mopar rock rails, Mopar skid plates, Rusty's 2-inch BB with shocks, cabin air filtration. Firestone Destination AT tires 255/70/R17, 4xGuard skids--front, rear, and belly, BDS rear diff guard, OME rear shocks.
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