Engine specs on a 2001 360 R/T

Most R/Ts have 9-1/4s. It's a 6 lug rear from '91-up. It's a narrow rear that I think's actually got the same perches, but that 6 lug part can make it more of a hassle to overcome than just getting an 8.8 or 8-1/4. The newer 8-1/4s are 29-spline IIRC, '96 or '97 was the changeover and saw them go up two counts in spline. Cherokees have the same bolt pattern and perch distance- gears should be tolerable to great. You'll want a 44 or 8.25 though.

An R/T didn't have a special cam, just a regular 5.9. OBD-II should have the balanced flexplate- especially after '98.