Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
There are two dofferent planateries for both 231 and 242 - straight cut and helicat cut. Design change was around 1994 or so. I can't remeber if the input gears interchange between 231s and 242s with similar gear cuts - they may very well be different - but the yokes are exactly the same 1310 series so same DSs can be used.
Also, input gears can be changed, so depending on which spline count you have on the tranny output, you choose the input gear based on that. Keep in mind this as well:
* there are three different input shaft lengths used on Jeeps with 231 or 242
* there are different thicknesses for input gear bearing size, so the precision machined length for bearing mating surface can be different
* there are two different gear cut styles on the Jeep 231s and 242s
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***