If the I6 WJ is underpowered, then is the heavier V6 WK worse? - JeepForum.com
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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WK Grand Cherokee & XK Commander Forum > If the I6 WJ is underpowered, then is the heavier V6 WK worse?

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Unread 02-15-2015, 07:35 PM   #1
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2004 WJ 
Join Date: Dec 2014
Location: mary esther, fl
Posts: 26
If the I6 WJ is underpowered, then is the heavier V6 WK worse?

I have read posts here saying the I6 is underpowered for a 4000 pound SUV and even though I'm no expert, my WJ I6 doesn't blow me away with power so I tend to believe this. Also, when I fill the gas tank or load it with concrete bags I can definitely tell the difference.

So... with the WK being about 500 pounds heavier curb weight, is this WK thing a slug or is the V6 better than the I6 for power? And long life?

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Unread 02-16-2015, 04:09 AM   #2
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2008 WK 
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3.7 is sufficient for motivation. That's about it really. It'll get the job done for someone who just wants to drive.

Towing? Gonna suck.

Passing? Gonna suck.

Offroading? Not gonna be much fun, for two reasons (power and no low-range).
08 5.7 Limited - Intake - Exhaust - SC Tuner - BT catch can - 5100's - white LED dash and lighting
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Unread 02-16-2015, 04:16 AM   #3
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the power to weight ratio of the 6-cyl WJ and WK leave a lot to be desired but the ratio is on par with many other competing SUV's so from a market perspective I'd say Jeep did not do much better or worse than the competition.

After owning an I6 ZJ all of the GC's I bought afterwards had V8's.......a Hemi WK is one hell of a street brawler even in stock form against many other SUV's in same size/weight class.
2008 Grand Cherokee Limited 4X4, Light Greystone Pearlcoat, Hemi, Tow Group, 18" Chrome Clad Wheels. Original owner, 20,000 miles

2002 Wrangler Sahara, black, 4.0L, 5-speed, Dana 44 rear axle with Trac Loc LSD, duel tan tops, Canyon wheels with Wrangler Silent Armors. 75,000 miles, 2nd owner.
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Unread 02-21-2015, 03:58 PM   #4
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2006 WK 
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I've had both a WJ I6 4.0 and now a WK v6 3.7. The 3.7 feels better and much more peppier off the line and more suitable for the WK. Passing power is lacking but I have no complaints My WJ struggled when the car was loaded up. Both are very reliable engines. Gas mileage was about the same for both, and quite poor. My 2013 Suburban with a 5.3 V8 gets just about the same gas mileage and is so much bigger.
2000 Red Grand Cherokee Laredo WJ
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2006 Black Grand Cherokee Laredo WK
3.7 with 65,000 Miles
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