Original issue is a not to Savage grinding noise when changing down gears from 4 to 3 and 2nd - I've changed the front diff and freshened up the CV,s and front end bearings, no issues there - I have a 5 speed trans from a 99 disco and now realize it is not a straight swap. Both units have 370K use on them. What is the likely hood the R380 is the issue or the transfer case, cheers