I recently had a set f 4:56 gears installed on my 13 Sahara JKU. I have a 2.5 inch suspension lift in the Jeep.When the Jeep first came back after the gear install, there was a vibration in the front end that we determined was caused by the front driveshaft (removed shaft, vibe gone). I sent it out to be rebalanced and it is now smooth. The pinion seal was leaking so we thought it was from the poorly balanced shaft so we replaced it the pinion seal. Now the new pinion seal is leaking again, but this time it only leaks at higher speed 55+mph.. Any thoughts? I checked the breather tube - it is not kinked or plugged. My gear guy has done may gear swaps and says they are set up perfectly. We just can't figure out why the pinion seal is still leaking. Any thoughts? I am tempted to buy a new Adams front driveshaft and see if a double cardigan helps. My other thought is to set up the Go-Pro camera underneath the Jeep and keep the lens pointed at the d-shaft/pinion area to see if we can visually catch something going on. Anyone else have this problem after a gear swap?