Geonovast Posted November 12, 2011 Share Posted November 12, 2011 A buddy of mine is looking to get a 99 WJ with the 4.7. The current owner says that the NP247(?) is going out. I've told him that I don't see any reason that a 231 could go in its place, but wanted to check with you guys first. Link to comment Share on other sites More sharing options...
carnuck Posted November 12, 2011 Share Posted November 12, 2011 The 247 is a Quadratrac II case. IIRC they are 29 spline Link to comment Share on other sites More sharing options...
jeepdoggydogB Posted November 12, 2011 Share Posted November 12, 2011 Great article in JP magazine about that a few years ago. http://www.jpmagazine.com/techarticles/ ... index.html :cheers: Link to comment Share on other sites More sharing options...
shelbyluvv Posted November 12, 2011 Share Posted November 12, 2011 Great article in JP magazine about that a few years ago. http://www.jpmagazine.com/techarticles/ ... index.html :cheers: That is a 242 swap article. There has been a few that have installed the 231 in a WJ but they can't get the speedo working. The WJ speedo is run off the rear diff through the sensor on the T-case. In 2000-2002 you could get a WJ with a 242. These are practically a bolt in. You will need a new rear drive shaft, shifter plate, and the linkage. All this can be found on car=part.com. Link to comment Share on other sites More sharing options...
Geonovast Posted November 13, 2011 Author Share Posted November 13, 2011 Alright, I let him know. Unfortunately he's under the impression that the only way this is fixable is by buying a $700 247 off of ebay... Obviously I'm not too up on the world of the WJ, but the problem is described as "it gets up to 70 just fine, then it starts slowing down, so it's obviously the T-case." :dunno: Link to comment Share on other sites More sharing options...
carnuck Posted November 13, 2011 Share Posted November 13, 2011 could be brakes dragging too or clogged cat. Link to comment Share on other sites More sharing options...
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