Ola, Don! not sure if you're asking about XJs or Grand Waggys; Donald can probably tell you more the Waggys than i can.
if looking for an XJ (labeled as Cherokees, Laredos, Wagoneers, Pioneers, and more depending on the whims of the marketeers), i'd want: - the 4.0L engine; one of the longest lasting gassers ever. not the best fuel economy, but generally considered fairly reliable, with a beautifully broad and flat torque curve. the smaller engines had much less power and didn't get much better fuel economy anyway. - the AW4 Auto Trans; another one of the longest lasting pieces ever produced. it's hard to find anyone who knows how to rebuild them, 'cuz they almost never need to be rebuilt! - the NP231 T'Case (a.k.a CommandTrack) no Full-Time 4WD, but much simpler, and actually rated for higher torque ratings than the Full-Time (242/SelecTrack) T'Cases. those seem to be generally considered the most reliable of the bunch of part found in the XJ, and you should be able to find that combo in a wide range of years. (Grand Cherokees are a completely different story, and you can't find that collection of driveline parts in a Grand except for in the first half of MY '93.) if you want ABS, you don't want the earlier versions; later ABS systems had much fewer problems, and generally gave you the additional benefit of better u-joints in the front end. if you're allergic to drivers-side airbags, you don't want anything after '94. there's lots more, but that should get you started. i hope that helps! cheers! e > Hola > I am considering another set of wheels for here in Mexico. > What years are good? What engine/tranny combo is the most reliable? > adios amigos
