I really don't mean this to be a jerk or sound like I know it all, MilanJeep, but the 3.55's were actually found in about 80% of 4.0L ZJs (Chrysler Sales Code DHP, DHM), and in about 60% of V8 ZJs (DHR). According to my sources, anyways. Might matter for someone hitting the JY's. But I totally agree with your recommendation on the HP30. All else being equal, the HP pumpkin and better shafts alone are worth their weight in gold.
1994 ZJ, 5.2L/46RH, NP242 & D44HD Swap, 4" SA Lift, 31" KM2s, and all the usual... I only lifted it so I wouldn't have to drive my grandma to church anymore... ;)
Remember: Every time you call a Jeep a "car", God kills a kitten.
Red Jeep Club #657