tgrt

Not for our Jeeps.

Go back and make sure the tire and gear combination is set right. Your computer might be confused.

It'll definitely help. My transmission was smooth with 32s and 4.10 gears. It had to kick down on hills, but nothing you wouldn't expect. Overdrive was functional and you didn't have to do anything weird.

You'd be screaming with 5.13s. You'd be about 2600 RPM at 70 MPH in overdrive -- 3800 RPM out of overdrive!

tgrt

I have the Hypertech Max Energy and it does not let you reprogram the shift points. It does however let you tell the computer the proper tire size and gear ratio so that the computer can calculate them.

Hellbound13

so between regearing and the programmer would either of those help with the issue I described?

tgrt

You shouldn't need the programmer, because you'll still be using factory specified tire and gear sizes. The service department at your dealership can program the tire size and gear ratio for you.

I believe the gears will help you quite a bit.

Hellbound13

Thanks so much for all your help. So even going from 3.73 to 4.10 you think it will help?

chuck45

3.73 to 4.10 wouldn't be worth the money. Do I recall that you're staying with 32's? If so it is my contention that Jeep Misgeared the stock Rubi with 4.10's and 32's. They should have done 4.56's.

Look at the formulas and plug in the numbers. The best performance I've had with the Jeep is my current setup which is 35's and 5.13's because it puts me at 2600 going down the freeway at 75. The stock was 2250 which is too low. I would NOT waste my money on ANY gear change that results in less than 2500 rpm on the freeway. This little engine is happiest above 2500 and you want to stay below 3000 for fuel economy reasons.

Hellbound13

I am staying with 32s. I dont have the Rubi, I have the X. I was hoping the higher gear would help prevent my Jeep from going into OD lockup at such a low RPM (1500). Im tired of having to floor it to get it to unlock. When I am going down the freeway at 75 with cruise on it keeps me locked at that 1500 RPM range and then if the Jeep needs power to get up a hill the cruise will shoot it all the way to 3000 RPM.

chuck45

Look into 4.56's; that would be worth the money - as long as you are going to stay with 32's. If you plan on going larger you'll have to rethink things.

Unfortunately the Jeep dealer doesn't offer anything larger than 4.10 if you're worried about your warranty. Find a good 4x4 shop that does a lot of gears. Dealers don't do enough to get good at them.

Hellbound13

But will an offroad shop be able to reprogram my transmission for the new gears, and also you saying that you think the dealer could easily screw up a gear install?

chuck45

I worked in auto dealerships for 15 years. Just because a guy is a mechanic there doesn't mean he knows his stuff. The last new car store I worked in, a large Chevy store, there were only two mechanics there I trusted to work on my own car. A dealership will do a warranty job on a differential every now and then. A busy 4x4 shop will do them daily. To do gears right takes expereince. If you have a local dedicated driveline shop they could do the work too.

As far as reprogramming your speedo the dealer can't go beyond 4.10's and 32's. You have to do that yourself with a Hypertech Speedo Calibrator which costs 200.00. I don't thinink it can be used on more than one vehicle. I bit the bullet and bought one so the shift points would be brought back to where they should be.