Is this hill decent working? -
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Unread 07-30-2007, 03:56 PM   #1
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2006 WK 
Join Date: Aug 2005
Location: New Yor/Long Island, New York
Posts: 54
Is this hill decent working?

My Jeep is 06 Grand Cherokee with the 5.7 liter Hemi.With the cruise control on at 60 mph going down a slight hill on a expressway the tach will drop from 2K to 1500 then go back up then drop again.Is this hill decent control?The tranny is in overdrive.Thanks Joe

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Unread 07-30-2007, 08:23 PM   #2
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2008 JK Wrangler 
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Location: WI
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'08 JK Sahara 4 door
'06 XK Limted Loaded
'90 YJ SOA, 35" MTR's, Ford 8.8, 4.56 gears, 355 sb, Warn sliders, skids, bumber/carrier Sold :(
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Unread 07-31-2007, 04:42 AM   #3
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2005 WK 
Join Date: Mar 2007
Location: Florida
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Whats probably happening is that when you go up the hill the cruise adds throttle to maintain speed and when you start to go down hill the cruise releases the throttle and your engine speed drops. Modern transmissions tend to unlock electronically based on engine load in order to save fuel. That could be a contributing factor in the drop in engine speed as well. I'm sure its nothing to worry about.

I'll test mine at 60 for you just to see if mine dose it as well.
05 Grand Cherokee Limited 5.7 Hemi 265/65/17 Revos, K&N
Previous Jeeps:
1998 ZJ Special Edition 2wd- Traded
1991 XJ 2.8 2wd Sold
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Unread 07-31-2007, 09:16 AM   #4
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1997 ZJ 
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Location: Michigan
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no hill decent on that year.
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Unread 07-31-2007, 11:24 AM   #5
2007GC Overland
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2007 WK 
Join Date: May 2007
Location: Maryland
Posts: 243
Hi Folks
My 07 has it and it will drop the from 5 gear to 4th to maintain the speed I set it at – work great but sometimes, I guess I would rather coast but with cruise control that is not an option. You can expect the engine to jump around with crusie control - it add power and takes it away.
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