You are correct it's the 42rle auto. It does seem like a steep gear but it is ideal for this tranny because of the .69 overdrive it has.
60mph - 2,250rpm
70mph - 2,600rpm
Right where the 4.0 is happy.
I ran my first tank in the city with only about 5 miles highway to break in the gears. My gas mileage increased noticeably. I went as far on 3/4 of a tank in the city as I used to get out of a full tank (to red warning indicator) on the highway. Haven't checked mpg's to find out what the actual increase is.
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BDS Springs, MetalCloak Arms, Fox Shocks, Warn Winch, Savvy Ft Bumper, Antirock, GenRight Fenders, GR8 Top, 35" Pittbulls, 5.13's, Revolution Axle Shafts, LS-III, 4L80e
'76 CJ-7, 33" Swampers, 6-Point Cage, 4-Speed, Dana 300 Twin Stick