I just did this swap with a 2006 4.7 Durango alternator.
One thing to note:
The pulley on this particular Durango alternator is a larger diameter than the factory TJ pulley. In order to get the full output, you should swap the TJ pulley onto the Durango alternator to get the same alternator RPMs.
The pulley is larger on the Durango alternators because the crank pulley is larger (7-1/4") versus the TJ (6.5"), and the Durango redlines at 6000 RPM, whereas the TJ engine redlines at 5200 RPM.
My new Remy alternator came with a performance test sheet, which was nice.
View attachment 185518
Note that the bottom scale is alternator RPM, not engine RPM.
This means I can get up to about 110 amps at low idle, and about 185 amps at freeway speeds. If I use the hand throttle to high idle at 1200 engine RPM, I can get about 170 amps.
Do you have the part number for the Remy. Could be my lack knowledge but seeing two options so not sure which to choose.
Just swap pulley from alternator remove from my LJ onto the new Remy alternato?