Looking for more POWER?????
JK Super Freak
Joined: May 2008
Posts: 1,279
Likes: 0
From: Grand Junction, CO
Ok here's what i'm runnin'........ 08' jk 4 door auto w/ 3" lift and 33" nitto mud grapplers. I have installed the cold air intake but thats it so far! My question is whats the next step to obtain more noticeable power gains for the money??? It really struggles on the highway and in the mountains!! Anyone got any good suggestions or mods that have worked for them??? Thanks for any advice you give! 
JK Jedi
Joined: Oct 2007
Posts: 5,537
Likes: 0
From: Colorado
X2. The exhaust/programmer might make a modest difference, but gears is really the only way to make a major difference short of big money engine mods.
JK Junkie
Joined: Jul 2008
Posts: 3,017
Likes: 0
From: Lakewood, OH
Gears are a much bigger issue and a more pressing need for an automatic than a 6 speed.
Here are the final drive line numbers for an automatic with 5.13s and a 6 speed with 4.10s.
Automatic trans with 5.13 gears, final driveline ratio.
1st gear 14.57:1
2nd gear 8.05:1
3rd gear 5.13:1
4th gear 3.54:1
6 speed with 4.10 gears, final driveline ratio.
1st gear 18.29:1
2nd gear 10.70:1
3rd gear 7.05:1
4th gear 5.13:1
5th gear 4.10:1
6th gear 3.44:1
That's a broader driveline ratio for a 6 speed on both ends of the gearbox with 20% less of a differential gear.
That said and with the knowledge that the original poster has an automatic, the answer is pretty definitive, gear, gear, gear.
With a 6 speed it's a whole different ball game and the urgency to re-gear isn't anywhere near as great and a whole different set of options can be explored to gain performance.
Here are the final drive line numbers for an automatic with 5.13s and a 6 speed with 4.10s.
Automatic trans with 5.13 gears, final driveline ratio.
1st gear 14.57:1
2nd gear 8.05:1
3rd gear 5.13:1
4th gear 3.54:1
6 speed with 4.10 gears, final driveline ratio.
1st gear 18.29:1
2nd gear 10.70:1
3rd gear 7.05:1
4th gear 5.13:1
5th gear 4.10:1
6th gear 3.44:1
That's a broader driveline ratio for a 6 speed on both ends of the gearbox with 20% less of a differential gear.
That said and with the knowledge that the original poster has an automatic, the answer is pretty definitive, gear, gear, gear.
With a 6 speed it's a whole different ball game and the urgency to re-gear isn't anywhere near as great and a whole different set of options can be explored to gain performance.
Thread Starter
JK Newbie
Joined: Oct 2008
Posts: 32
Likes: 0
From: columbia, sc
Ok guys, you've talk me into gears...... Now the only problem is I live in SC and don't know of anyone that will install them and do a good job??? I've asked the dealership and they said they wont touch it..... So if anyone knows of someone in the area please let me know!! Thanks again for all the help!!!