I have been using the RTV you can get from your local auto parts store that is made just for gear oil. Never had a leak and have been using it since day 1 with mobil 1 (75w140). I now have 105,500 miles. No friction additive is needed in your Jeep. The only guys who need friction additive are the ones that have QD II and it says QUADRA-DRIVE II just below the gear shifter in the area of the 4 low t-shaped handle. Mostly HEMI Jeeps and a select few with the 4.7 Have QD II