I am running 5.38s with 37s on my 3.8 so I would say go with 5.13s for 35s. Also they will work if you bump to 37s some day.

 

Thanks for the info guys. Jeeps going into the dealer next week to have the overdrive switch repaired. I'll ask the dealership their thoughts too.

 

So i was doing some more research and Yukon has a formula they use for finding what gears you need. Its (NewTireSize)x(CurrentGearRatio)/(OriginalTireSize) any thoughts on this?

 

thats been arround for a long time. gearing is easy for the 3.6 JK want stockish rubicon set up 33's with 4.10 35's with 4.56 or 37's with 4.88.
If you have the automatic just jump up one gear set higher for example 33's with 4.56.
The old 3.8's needed deeper gears so you would have to go even deeper.