Join Date: Feb 2013
Location: Phippsburg, Maine
They are both 3.55s. The ZJ has a D30LP(Low Pinion), and the XJ has a D30HP(High Pinion).
IIRC they are interchangeable, not sure if the drive shafts are the same length though.
Check the ZJ FAQ section.
'93 V8 ZJ Mountain Goat Edition.
'95 V8 ZJ Limited, '97 4.0L ZJ TSi
'96 4.0L 2wd XJ, '88 4.2L YJ