Not a stupid question at all. In a 6 speed the super chips won't do anything that affects the performance of the transmission.

Again I'll have to disagree with the terminator. The Superchips Flashpaq is well worth the money. What it will do for you is allow you to reprogram your ECU/PCM to know about your larger wheels/tires and your new gear ratio. This allows the computer to be able to calculate all th wheel speeds correctly for displaying on your speedo, managing traction control, brake lock differentials, ESP, etc.

Besides that I find that the Superchips tune definitely improves drive ability with a bit more power across the board and better throttle response.

You get some othe extras too, like the ability to change your TPMS thresholds. I run my tires at 28 psi on the road as suggested by a BFG engineer. Without the Superchips Flashpaq I'd always have the light on the dash telling me my tires were low. With the Flashpaq I've reset my threshold to 26 psi.

There are some other features you get as well. I'll let you do our own research, but I think that a Flashpaq is a really great product. Getting your ECU/PCM reprogrammed to know hat size tires your running and what rear end ratio you have is just another aspect oh having a well sorted rig.

 

This has been a great thread. I have an 07 auto. Looks like I need to save up some money. But gears and a flashpaq seems worth it.

 

What a mess this turned into.

To OP... yes, you can justify regearing or not regearing depending on your priorities (money saved or performance). It's a game I played in my head for awhile before regearing. In the end, I've spent over 7K in modifications to my jeep, and none have been better than the regear. I drove my jeep with 3.21's for over 60K before I regeared, and i should have done it a long long time ago.
The distance between gears isn't going to be as evident until you're on grades or towing, which i do a fair amount of. Reducing the distance between gears puts you in the right part of the power range for the 3.8

in addition, one of the justifications I had in my mind was that all my other manual cars are 5 speed, why do I need the 6th? Well I think it's because of the ratios of the gears that are in the jeeps manual transmission, and the sweet spots of the JK motor. It just simply isn't set up to be a 5 speed based on how tall the tranny gears are, and the power bands of the jk motor. There is just no extra wiggle room, and when you take out that gear, its gutless. I'm no expert, but I hope I have put my experiences in words better than others have attempted.

edit: drove it 90K before I regeared, 60K of that with larger tires...

 

OK, so torque multiplication through gearing in transmission, transfer case and axles is an absurd comment to you. What else do you find absurd? The sun doesn't actually go up and down?

Umh, there are a lot of products that claim hp gains. Just 'cause Superchips claims 16/21hp gain doesn't mean anything. Let's see some dynos, where are they? If they claim this gain, they must have dyno'd it. Where are these dynos?

I see... you don't have a superchips, yet, you know somehow better than me how much power it adds. You're also on stock tires. What can I say, another internet clown. You and ghostjk should hang out. You'd form a perfect couple.

 

The 6th gear in JK manual transmission is basically an overdrive gear. If you take it out (as in cruise in 5th), it doesn't make the JK gutless, it actually gives it life. The transmission itself isn't setup with tall gears. In fact its 1st gear 4.46 ratio is one of the lowest you'll find in Jeep manual transmissions.

 

You're wrong. its gutless. I never used 6th for 60K miles. It's gutless. I changed the gears, whole new vehicle. I never had this problem with other manual cars I had, now I don't have it with this jeep.

but not using 6th, you certainly aren't "giving it life". Its stays the same and you are just not using 6th...

 

TheTerminator = Moron

Please stop giving bad advice!!

 

So I am driving home from work yesterday, doing like 65, engine steadily at 1500 rpm on over drive. I think to myself... What would possess me to turn my overdrive off ( auto with 3.73) and think I could get 19 mph like Theterminator? so I do it, I turn over drive off and you would never guess what happened... My rpms shoot to 3200, I look my mpg and it's steadily going down. I was rather disappointed, wasn't the math supposed to prove that overdrive and 31s was the same as third gear and 35s.

 

I must have missed that part where there were claims of gaining MPG by downshifting and driving in a lower gear. I refuse to go back to look for it.

If I understood TheTerminator's arguement against regearing to a shorter gear ratio correctly. Regearing wasn't required as long as you retrained yourself to just not upshift like you normally would, never shift to 6th gear ever! Instead operate 1 gear below where you used to operate and it's the same as having a shorter gear ratio.

Did I get that right?

 

Thank you for responding before I did!!!

I HAVE a superchips!!! I didn't waste my money it did help my performance my mpg and everything else I bought it for.

Hopefully someone can answer my question