Has anyone looked into changing their gear ratios to regain MPG and performance after changing to a taller tire?

I was looking at the Ring and Pinion gears by US Gears at rocky-road.com
http://www.rocky-road.com/kjdrive.html

Any experience or alternate opinions?[/url]

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2006 CRD Limted 4x4, Inferno Red, 22G package, Heated Leather Seats
GRD Eco Tune, CRD Frankenlift II, Super Skid I, 245x75R16 BFG Alterrain AT, ARB Bull Bar, Rock Rails, Kilby Tank Skid, Skid Row Transfer Case Skid

I noticed your KJ is a 4X4. The thing is, with the KJ's Dana 30A (aluminum) front diff, we can't run regular Dana 30 gears. Only ones specifically made for the 30A. Getting rear gears up to 4.56:1 is easy, but getting the front gears to match is just not possible yet. 4.10:1 gears are available from Mopar, but they are pricey. A few people have gone that route though. The ones from Rocky Road will work for the rear Chrysler 8.25, but not for the front.

Rick

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2002 Jeep Liberty Limited 4X4
all the usual suspects

If you're looking to go to 4.10:1, you could try to scrounge some gears, or the whole front diff, from a wrecked 4cyl KJ, if you can find one. Should save you some of the cost of buying them from the stealership.

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04 Sport - SOLD
Factory skids, All J's Super Skid II, Rock Lizard Skink Sliders, Frankenlift, 245/70R16 BFG AT's on Cragar Soft 8's, Cobra 75 CB

'04 TJ Sport - Solar Yellow, D44, stock for now

The ring and pinion gears at RRO will fit the rear. They will NOT fit the front. We pulled the front diff from a 4 cylinder to get the 4.10's up front on mine. With 29.5" diameter tires, going from 3.73 gears to 4.10's cost me about 3 mpg at interstate speeds, and no difference in stop and go city driving.

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June 2001 Liberty Limited 4X4
Frankenlift II Premium, Al's Upper Arms, 245/75R16 C Silent Armors on Moabs, RL Skink Super Sliders, Rear DTT, Riddler Diff Cover, Fastman Throttle Body, Profinish-Proglass Hood, Borla Dual Outlet Exhaust, TransGo Reprogramming Kit, APS Stall Converter, 4.10 Gears, B&G Chrysler PCM, Lots of Line-X, etc...

Thanks for all the input.

Sucks to hear, but I guess that is the information I was looking for.

If anyone has come up with a better or alternate solution than listed above, then post it here for the rest of us.

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2006 CRD Limted 4x4, Inferno Red, 22G package, Heated Leather Seats
GRD Eco Tune, CRD Frankenlift II, Super Skid I, 245x75R16 BFG Alterrain AT, ARB Bull Bar, Rock Rails, Kilby Tank Skid, Skid Row Transfer Case Skid