I have a 2008 JKU with a manual trans and went with 4.88's. Hindsight 20/20 I would be happier with 4.56's as it's overgeared like crazy--I can leave in 2nd with no problems and it will accelerate uphill in 5th/6th depending on the grade. 70mph cruise at just under 3k rpm in 6th on the interstate, 10mpg at best. I'm going to end up on 37's (minimum) just to get the gearing closer to ideal. You'll have the same results as we aren't that far apart and our terrain/landscape is basically the same.
I can't tell you about Philly shops as I don't know, but I hear good things about River City Offroad and I've dealt with Mt Zion Offroad here in York (they did my gear swap and I have no complaints about their work, the gear ratio dissatisfaction is completely on me as that's the ratio I chose going by the charts above). MT Zion is currently running a $1500 regear package, everything included.
Last edited by '51plymouth; 02-23-2015 at 05:12 AM.