If it's got a 4.0L:
42RE
Probably an NP242, maybe an NP249
D30 front
D35 rear
3.55 or 3.73 in the axles
If it's got a 5.2L:
46RH
NP249
D30 front
D35 rear
3.73 in the axles
The Orvis was really just an appearance package, there wasn't anything different about the driveline compared to the non-Orvis ZJs. IIRC the UpCountry package was included in the Orvis option and included the 1" lift springs and skids/hooks.