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Old 05-03-2013, 08:38 PM
4x4Dad's Avatar
4x4Dad 4x4Dad is offline
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Join Date: Aug 19, 2008
Location: Yorba Linda, CA
Posts: 319
What's involved in NP229 --> NP242 swap?

My 229 transfer case just imploded, right after I passed smog (the Jeep gods know I got a bit of tax money back this year). As I drove home in 2wd, it sounded like my kids eating hard candy near a PA system. Quite ugly.

I've got a line on a local NP242 with SYE from a Grand Cherokee. I've confirmed its a 23 spline, so I think it should bolt up to my TF727 okay.

But I'm not sure what I need to do beyond that.

I've read nearly every forum thread on NP242s, but I'm feeling in the dark still, so i felt I needed to post a thread. I know the rear drive shaft will need an adapter, at minimum, to bolt to the SYE, but will I have to buy an all new shaft? Is there an adapter that will allow my stock rear shaft to bolt up? Is there an XJ or ZJ shaft that I could use instead? (I'm assuming not because of the slip yoke feature, but I'd love to be corrected.)

What will I have to do differently to the front shaft?

A reman 229 is out of my budget range (upwards of $800 with tax), whereas the 242 with SYE is local and only $250.

Any insight/advice/experience you can provide would be great.

88 GW, AMC 360 with Doug Thorley headers, Howell TBI, NP242, TF727, 3.31 gears and the tow package, Magnaflow muffler and cat, BJ's 4" springs + 2" blocks and 1" shackles, and 1" body lift, 32" BFG's, aluminum rad, K20 front brake calipers.

My Jeep has tricked me into thinking I know what I'm doing.
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