|05-05-2013 08:54 PM|
"this cant be true. let me share what happened to me.
I bought my jeep brand new off the lot thinking I had 3.21's. after installing 37's I found that it really wasnt that bad to drive. something had to be up, so I checked my build sheet. sure enough, I had 3.73's! for some reason my jeep came with a procomp branded hypertech programmer that tunes the computer for gears and tires. I changed the gears setting from STOCK to 3.73 and now it drives a hell of a lot better. shift points are just beautiful"
The "for some reason my jeep came with procomp yada yada" threw me.
If you would have replied for some reason the dealer included it then I would have understood.
|05-05-2013 07:55 PM|
|05-05-2013 07:54 PM|
|05-05-2013 07:07 PM|
Good to know. I checked I have the 3.73 with the tow package
|05-05-2013 10:19 AM|
To the OP have the dealer purchase a ProCal for you and use that to reset the gears and tire size.
|05-05-2013 06:15 AM|
the what was a dealership add on not a factory add on. Many things are added at the dealership level that have nothing to do with being factory.
|05-05-2013 12:23 AM|
|05-04-2013 09:13 AM|
|MichaelEdwardsDO||And the 3.21 tow package stinks for towing in my jku with 35's. not sure about anybody else's because I don't drive them but I feel like I'm heading up hill on flat land|
|05-04-2013 08:25 AM|
there are two tow packages:
the normal tow package is hitch and wiring with 3.21 2000 lbs capacity
max tow is hitch and wiring with 3.73 gears 3500lbs capacity
|05-04-2013 04:37 AM|
I am just going off memory here, so forgive me if I am wrong but when I was purchasing my 2011 & 2012. I believe there are two tow group options.
Max Tow Package
Could it be that only the max comes with 3.73???
What does your sticker say?
|05-04-2013 02:37 AM|
The window sticker showed that I was getting the Tow Group Package.
The salesmen showed me what came with the Tow Group Package from Jeeps website.
The 2013 brochure and Jeeps web site state that the Tow Group Package allow the wrangler unlimited to tow 3,500.
That said all 2013 unlimited models should have come with 3.73 or 4.10.
Jeeps Website states that the Tow Group Package includes the 3.73 ratio.
Thanks... For the info on the Procal, I will be meeting with the dealership in the morning.
|05-04-2013 12:50 AM|
Window sticker. or ask for your build sheet.
|05-04-2013 12:17 AM|
Ohh snap! How do I know which gearing I have?
|05-03-2013 11:53 PM|
|05-03-2013 11:47 PM|
|ohioviper||Why would your new Jeep come with a programmer ?|
|05-03-2013 09:50 PM|
I bought my jeep brand new off the lot thinking I had 3.21's. after installing 37's I found that it really wasnt that bad to drive. something had to be up, so I checked my build sheet. sure enough, I had 3.73's! for some reason my jeep came with a procomp branded hypertech programmer that tunes the computer for gears and tires. I changed the gears setting from STOCK to 3.73 and now it drives a hell of a lot better. shift points are just beautiful.
|05-03-2013 09:43 PM|
|ohioviper||He may have wanted 3.73s but the dealer ordered 3:21s or told him it was 3:73 when it was actually 3:21. I promise you the build sheet and window sticker match whats actually in it when it rolls out of the factory.|
|05-03-2013 09:13 PM|
|socal-jk||I'm more worried how a jeep that's supposed to have 3.73's are ending up with 3.21's.......|
|05-03-2013 09:00 PM|
We can't change the PCM gear ratio at work. Our scan tool programming doesn't allow it, cause Chrysler doesn't want us to be able to. The Federal Emission laws are so strict now that they don't allow us to change things like this to avoid liability if you don't pass inspections and such stuff. We found this out when we changed a 2012 Sport from 3.21 to 3.73 such as yours has. We called Jeep & found out we can't do that any more. The ProCal is what you need to change it with. And no the PCM won't learn on it's own from speed sensors. It will set all sorts of gear ratio, inplausible wheel speed & various other codes. And if it's an automatic it will start shifting all crazy.
My wife's JK has 3.21s & I pull my mini stock dirt car on a dual axle flatbed trailer with it all the time w/o any issues or hesitation. The dirt car weighs in at 2200lbs by itself. Just make sure it's loaded level always leave room in front of me in case I need to stop quick.
|05-03-2013 08:40 PM|
Your not the first 2013 to regear by far. The procal will set your ratio and you will be good to go in minutes. I bought my procal from Quadratec. Your window sticker is what you want to look at for axle ratio.
|05-03-2013 08:20 PM|
|streamlinedg||Where can I get a procal and how much is it?|
|05-03-2013 08:03 PM|
No, Chrysler is paying for the parts and the dealership is covering the labor.
Keep in mine that I paid for the Tow Package Group. The 2013 brochure and Jeeps web site says a Wrangler Unlimited can tow 3,500 lbs.
I feel better after talking to them in detail about the problem.
Apparently the new Jeep Wranglers are set up with a code that must come from Chrysler so that they can go into the program and put in the correct ratio. They said as far as they are aware my Jeep is the first 2013 to upgrade the gearing.
I suspect that most Jeep owners think they have the 3.73 gears. Because they are going by the brochure. I found this out from the forum.
|05-03-2013 07:49 PM|
|05-03-2013 07:27 PM|
The Procal works on 2013 models, but the dealer won't be able to use one because they are coded to each vehicle they program. Each Procal will only do one at a time and the one it did must be set back to original specs before another one can be done. So, you might have to get one for yourself.
I don't know where the speedo is measured from, but if it's axle rotations measured on the ring gear, like my Dodge, there is no calibration needed, only for tire size changes.
Maybe they can't do it because it doesn't need to be done.
|05-03-2013 07:01 PM|
|05-03-2013 06:51 PM|
|TOK||Thought I read comments here about the Procal not working with the 2013 (yet).|
|05-03-2013 06:19 PM|
|05-03-2013 06:13 PM|
Procal will do it in 5 minutes. Though I doubt your dealer has one laying around. Takes 5 minutes. Swapped from 3.21s to 4.56s and changed gear ratios on my 2012 auto.
|05-03-2013 06:07 PM|
|05-03-2013 06:07 PM|
nope you need to recal with procal
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