I've got a 91 XJ / Jasper NP242 with SYE, D30 / D44 at 3" and planning to go to 4.5"
The RE site says "Over 3.5-inches of lift on a full-time NP242 unit may cause unacceptable vibrations on the front driveshaft, when driven in ”part-time” or locked constant use 4WD."
After searching forever, setting caster at 5.5 (from GoJeep's site) seems a good place to start. And rebuilding the front shaft would be a good idea considering mileage.
Going with RE drop brackets, adjustable upper and lower control arms so pinion / caster changes won't be that difficult. If necessary, I can add a T-case drop (not something I'm keen on).
I know there are a few people out there running an NP242 on a lifted Jeep that have addressed vibrations on the front driveshaft. . .
The RE site says "Over 3.5-inches of lift on a full-time NP242 unit may cause unacceptable vibrations on the front driveshaft, when driven in ”part-time” or locked constant use 4WD."
After searching forever, setting caster at 5.5 (from GoJeep's site) seems a good place to start. And rebuilding the front shaft would be a good idea considering mileage.
Going with RE drop brackets, adjustable upper and lower control arms so pinion / caster changes won't be that difficult. If necessary, I can add a T-case drop (not something I'm keen on).
I know there are a few people out there running an NP242 on a lifted Jeep that have addressed vibrations on the front driveshaft. . .