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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > successful 242 swap.

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Unread 04-13-2013, 04:57 AM   #1
ZJfamilyfun
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1998 ZJ 
 
Join Date: Mar 2013
Location: Alpena, Michigan
Posts: 161
successful 242 swap.

Took 6 hours. 1.5 to remove 249. 1.5 to install 242. 3 hrs. Drinking in between tasks. I picked up a 242 out of a 98 zj. W/ a 4.0. For $75. Bolted right up. No mods no nothing. Just remove 249 and reverse for install. Just had to adjust shift linkage...... totally awesome. Thanks for the wonderful write up.

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Unread 04-14-2013, 12:43 AM   #2
ZJfamilyfun
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1998 ZJ 
 
Join Date: Mar 2013
Location: Alpena, Michigan
Posts: 161
Went out for a maiden voyage today, and totally loved it. Gained 3mph both city and highway!!!! Now 13.8 city 17 hwy.
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Unread 04-14-2013, 12:59 AM   #3
dnuccio
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1995 ZJ 
 
Join Date: Jul 2012
Location: Phoenix, AZ
Posts: 3,484
i dont think you gained any mpg. the entire front axle components are still turning whether its in 2wd or 4wd thats what causes the decrease in fuel mileage. the only way to benefit from the 242 swap fuel economy wise is if you installed manual locking hubs, which IIRC the kit is over 1000 bucks, so its really not worth it.
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Unread 04-14-2013, 07:44 AM   #4
LouC
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2007 WK 
 
Join Date: Feb 2008
Location: NY
Posts: 1,382
Agree based on my experience of running a ZJ with a 242 for 15 years. It's possible your 249 was binding up in turns and that may have lowered your mpg. I have tried running my ZJ in both 2wd and full time and there really is no difference in mpg. The nice thing about the 242, is flexibility. If you have a bad winter, you can leave it in full time. To reduce wear and tear you can run in 2 WD. Off road 4x4, part time works great, no waiting for auto engagement like other systems. One improvement I could have suggested was a Torsen differential to provide auto lock up in full time. Overall, the 242 is a great case for people who don't mind shifting for themselves.
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Unread 04-14-2013, 04:26 PM   #5
ZJfamilyfun
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1998 ZJ 
 
Join Date: Mar 2013
Location: Alpena, Michigan
Posts: 161
Yeah. The VC in my 249 was wasted.....right turns on city were taken like big trucks. Nice and wide. nd we parked in the far back of parking lots to avoid having to try to make the tight maneuvers. But yes we did gain significant mpg increases. And my wife and I are old school. We don't mind pulling a lever to engage 4wd. But all in all I'm way happier.
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