This is my first post so I hope it goes ok. I have a 2008 JKU Sahara. I plan on updating it by May. I plan to install a RIPP Super Charger, Headers, Cat Back Exhaust, 3" lift and plan to run true 33's, as this is my DD vehicle. With these MODS, do I need to upgrade from my current 3:73's to say 4:88 or even 5:13. I have a K&N FIPK installed now with a JET Chip and routinely get between 20-22 on the HWY My goal is to keep this if possible. Any advice would be great.
Thanks,
John

 

Biggest thing is whether or not it is auto or standard. There is also a chart online that has the gear ratio for above based on tire size.

 

My bad, it is automatic.

 

I wouldn't worry about it if you are only going to run 33s. You won't have a power issue esp with the ripp

 

5:13 would definitely be too much for the 33's. 4.56 would be a good match but honestly I don't think it will be that bad with what you have especially if you are supercharging

 

I started out on 32s with no mods and was averaging 14.9 in mixed city and highway driving. I installed Ripp Headers, 3" Tereflex Long Arm, Cat-Back, and Diablosport Predator tuner. I have 4.10 gears which i have not changed YET. I am now averaging 15.7

I don't expect that to change with the gear swap.

Just wanted to point out that if your only gonna run 33s with the mods you plan on making you will most likely keep the same MPGs. I did notice a MPG improvement with the headers and cat-back. I ran without the 35s for a few weeks and was averaging 17.9 with mixed highway and city. Yea, I lost 2mpg with the new tires.

 

Thanks everyone for your input. It really does help. Have a Great Thanksgiving