For the last month or so, When i start the jeep in the mornings and drive down the street slowly i can feel a thumping (feels like a BAD BAD flat spot on a tire) But after about a minute or so of stop and go driving its gone, And it will not do it again till the next morning. So i cant really drive down to a shop to let them feel it.
2014 Jeep Wrangler JKU on 35 with 2.5 lift. I did get it regeared and new front axel seals about 3 months ago.

Does anybody have a clue what this might be?

 

Welcome to JKF.. Your description is IMO classic COLD tire Flat Spot .. Check your Air Press cold.. I run 35s on 17x9s at 27-28 Cold year round.

 

These tires have been on for a few years always sitting at around 30lbs. Being in canada we have cold weather for long enough

 

Easy enough to test the flat spot theory.....jack it up in front and rear overnight just so the full weight isn't on the tires.

 

Flat spots if it goes away after a mile or so. As suggested check your tire pressures. Just drive slower for that mile and enjoy.