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Unread 04-07-2011, 03:17 PM   #1
royhkeith
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2010 KK Liberty 
 
Join Date: Nov 2010
Location: Silver Springs, FL
Posts: 58
Twin cluch automatic transmission in 2010 Liberty?

Somewhere I remember reading that the 2010 Liberty 4-speed auto transmission is a twin clutch design. Is this so?

1) I read that a twin clutch is much smoother and faster shifting due to the fact that one clutch handles odd numbered gears (1 & 3) while the other clutch handles even numbered gears (2 & 4). This way the next gear is already engaged before the opposite clutch engages.

2) I read that this reduces MPG somewhat.

3) My 2010 and previous 1997 Grand Cherokee both have 4 speed automatics. The 1997 would shift smoothly to 4th gear and then the torque converter would firmly lock-in. If a slow down in speed required a lower gear to accelerate, I was never sure when the torque converter would unlock or when a shift to the next lower gear would occur. The change might occur long after easy pedal pressure had been applied, resulting in an unexpected RPM increase and a rough gear shift. The 2010 RMP will increase with no feeling of a rough shift of any kind. This results in a marked improvement in smooth shifting especially when resuming speed after a slow down due to traffic or a turn. But, the torque converter lock-up is slow to occur compared to the 1997. It seems to have 2 RPM decreases between 4th gear and final converter lock-up unless I ease my foot off the accelerator. Is this due to the Twin clutch design?

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Unread 04-07-2011, 03:59 PM   #2
tjkj2002
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2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
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You have the 42RLE auto trans in your '10 KK,just a mordern version of the A604 trans that began in the 1st Chrysler minivans.
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Unread 04-07-2011, 05:58 PM   #3
allskiing
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I tell you what....If the kk had a six speed I would be very happy.
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Unread 04-07-2011, 09:32 PM   #4
BloodyShadow23
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2008 KK Liberty 
 
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I have seen 2008 KK's have 5-speed manuals but I think that is only for international KK's. Shame
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Unread 04-07-2011, 09:41 PM   #5
richd
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Quote:
Originally Posted by BloodyShadow23 View Post
I have seen 2008 KK's have 5-speed manuals but I think that is only for international KK's. Shame
Some 08 KK had a 6 speed(manual) here in the U.S.:
2008 Jeep Liberty

The six speed manual and four-speed automatic transmissions continue. The standard 3.7-liter SOHC V-6 engine produces 210 hp (157 kW) @ 5,200 rpm and 235 lb.-ft. (319 Nm) of torque @ 4,000 rpm. Fuel economy (with the standard - and only - V6) was improved by about 2 mpg with either stick or automatic; it is now an estimated 16 city (18 mpg using 2007 EPA standards), and 22 mpg on the highway (23 mpg based on 2007 EPA standards).
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