If youre ripping up diffs, driveshafts, cv's and axels, then this is your culprit. A seized viscous can really do a number on a borg warner transfercase fitted rover. this unit is drive tested, bench tested and comes off an 84K mile HSE P38. Fits all years from BW RR from 89-02. If you have any symptom, or fitment questions, PLEASE ASK!!!! This unit retails for over $1200!!!