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Thread: 2012 w/3.21s and Lift/Tires-Results! Reply to Thread
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Topic Review (Newest First)
10-15-2012 10:10 PM
ohioviper DJBR1 what lift kit did you go with. That thing looks great. Mine is exact same minus the tires and lift but tires are coming soon.
10-15-2012 09:55 AM
jadmt
Quote:
Originally Posted by onetraveller View Post
To answer the poster who asked how the Pro-Cal helps with driveability, you have to think GI-GO (garbage in - garbage out). If you don't give the computer accurate information, it can't set the shift points in the electronically controlled automatic transmission to the optimal position. It's less of an issue in a manual.

Mike
I agree with GI-GO but I asked AEV if the procal got into that part of the computer and they said no. So I am not sure how it can affect the shift points.
10-15-2012 12:45 AM
JeepHerz Since this had been re-bumped- it's been a few months since the lift and tire install. I'll be re-gearing without doubt. Totally a matter of opinion- but the tendency to downshift at/to low RPMs is driving me crazy. I drive mostly city- and my Jeep is downshifting at 40 MPH- into 4th- at about 1400 RPMs. WAY too low- no engine or tranny should run there. I could deal with the change otherwise but this is 90% of my daily drive. I've attempted to correct with Procal but no luck. This may be limited to my Jeep- but I doubt any dealer will fix much less investigate. Just a matter of 4.56s or 4.10s and when I win the lottery. (Since I might as well add lockers while I am at it). And get rid of the 34s I put on to avoid a re-gear- and put 35s on.
* Adding a "this is only an opinion" disclaimer here. Plenty of Jeepers seem to be able to deal with the performance change.
10-14-2012 11:45 PM
onetraveller To answer the poster who asked how the Pro-Cal helps with driveability, you have to think GI-GO (garbage in - garbage out). If you don't give the computer accurate information, it can't set the shift points in the electronically controlled automatic transmission to the optimal position. It's less of an issue in a manual.

Mike
10-14-2012 09:11 PM
jcull35 Does anyone run 305/70r17 with the 3.8 manual and 3.21? I am thinking about going up to these, on my next set of tire without re gearing.
09-08-2012 10:51 PM
JeepHerz For those that have a manual- losing a gear might seem pretty substantial. I've read that on almost every thread consistently-losing 6th. I think the automatics are more subjective. A buddy just went with 35s on his hard top Unlimited- and says he barely noticed. Wit hthe e
08-31-2012 10:58 PM
JeezAJeep I have 2012 JK automatic and getting 4 Pintlers and the AEV full lift 2.5 kit. I hear all different opinions on the loss of power ranging from "substantial" to "minor". I am confused as all hell. I will likely go with Nitto Trail 295/70 17's.
08-31-2012 04:00 PM
WeTri Good info, thanks!
08-31-2012 02:49 PM
MikeK46
Quote:
Originally Posted by JeepHerz View Post
The new 3" Mopar lift is installed and the KM2s are on- along with a Procal tire size programming change.(It makes a difference).
How does re-programming the tire size with a Procal help with power/acceleration? I thought it's just for making the speedometer/odometer accurate again.

I have 3.21 gears and just installed RR wheels and 33" DuraTracs, and immediately noticed loss of power/acceleration even though the tires are only 10lbs heavier.

The 33" DuraTracs are only 3/4 of an inch larger than the stock Bridgestone Duelers, so speedometer/odometer accuracy isn't a concern of mine.
07-12-2012 07:55 PM
firehawk
factory 17"

hi, i got factory 17'' rims and 32 tires S package with 5 speed auto and
it runs fine, 3.21 if i wanted 15mpg's i would have ordered the 3.73 like i had
on my 07jk 2 door, but we all like something different that's one of the many
good thing about the wranglerwhen i trade in my 2012 it will not make
any difference at trade time, which will be 2014 with 8 speed auto only
have about 400 days to go! i love the wrangler forum..next jeep #7....
07-12-2012 07:52 PM
JeepHerz The changes are minor so I doubt it. Most everything you do on a Procal the dealer also does. Plus you can always restore to factory default settings so they'd never know you used it anyway.
07-12-2012 07:50 PM
kjeeper10
Quote:
Originally Posted by bakerboys
does procal programmer void warranty
no
07-12-2012 07:45 PM
bakerboys Does procal programmer void warranty
07-12-2012 07:12 PM
kjeeper10
Quote:
Originally Posted by DJ_B1R

Thanks for the reply. So say I get the Adam's drive shaft, I should be good? I just don't want any problems in the future.
The front is fine--as Pluke said--adding lca's is nice but, positive caster will make the pinion worse. You will need adjustable rear uppers to set pinion angle w/ a double cardan DS or you might/will get vibes.
07-12-2012 06:44 PM
dawhitesJKU great thread. Sub'd
07-12-2012 05:18 PM
DJ_B1R
Quote:
Originally Posted by pluke the 2

if you install a new front drive shaft and your jk is at 3" or above it means that your caster with stock control arms is less than stock 4*, meaning you will not need to install new front lower control arms unless it's flighty on the freeway. but having a new front drive shaft will not make it any more flighty than it is now without one.
Thanks for the reply. So say I get the Adam's drive shaft, I should be good? I just don't want any problems in the future.
07-12-2012 04:01 PM
pluke the 2
Quote:
Originally Posted by DJ_B1R View Post
Concerns, yes. I've been reading up on the thread about the 3" lift and up.
Since the lift is a week old and wheels/tires put on yesterday no problems yet of course, but I want to remedy the situation before it becomes a problem. it'll be a bit before it goes off road, but want to get the parts I need to fix now so its over with. Adams drive shafts seem nice, but not sure if I need lca's or what not as well....
if you install a new front drive shaft and your jk is at 3" or above it means that your caster with stock control arms is less than stock 4*, meaning you will not need to install new front lower control arms unless it's flighty on the freeway. but having a new front drive shaft will not make it any more flighty than it is now without one.
07-12-2012 01:56 PM
DJ_B1R
Quote:
Originally Posted by 1quick1

Do you have any drive shaft concerns? My understanding is over 2.5'' you run a risk of drive shaft damage.

Looks good btw
Concerns, yes. I've been reading up on the thread about the 3" lift and up.
Since the lift is a week old and wheels/tires put on yesterday no problems yet of course, but I want to remedy the situation before it becomes a problem. it'll be a bit before it goes off road, but want to get the parts I need to fix now so its over with. Adams drive shafts seem nice, but not sure if I need lca's or what not as well....
07-12-2012 01:43 PM
kjeeper10
Quote:
Originally Posted by JeepHerz

Good point. KM2s run smaller than "standard." Ie: a 34" KM2 is not 34". I bought PMetric so they're an odd size anyway. Mine are 33.9" tall- I used 34". I know that makes it a little off but I am not too worried.
I plan to try changing it to 35"s and see if I can trick it into better gear shifts. I wanted to get a full tank or two in first. I doubt it'll work but I'll give it a try. I love that gadget.
Most tires are smaller than advertised. Even the stock KM's.
07-12-2012 01:35 PM
1quick1
Quote:
Originally Posted by DJ_B1R View Post
I installed my 3" lift last week and yesterday put on my 15x8 wheels and 33x12.50 Duratrac's. Waiting for my Procal to make the tire change and tpms. Drove it around town and not bad, but sure it'll be a little better with the Procal.
Do you have any drive shaft concerns? My understanding is over 2.5'' you run a risk of drive shaft damage.

Looks good btw
07-12-2012 01:31 PM
JeepHerz
Quote:
Originally Posted by MacCTD View Post
Looks good, what size did you use on the Procal? From what I have read and used on my JK the actual tire size is often smaller than what is listed.
Good point. KM2s run smaller than "standard." Ie: a 34" KM2 is not 34". I bought PMetric so they're an odd size anyway. Mine are 33.9" tall- I used 34". I know that makes it a little off but I am not too worried.
I plan to try changing it to 35"s and see if I can trick it into better gear shifts. I wanted to get a full tank or two in first. I doubt it'll work but I'll give it a try. I love that gadget.
07-12-2012 07:20 AM
ESP
Quote:
Originally Posted by DJ_B1R View Post
I installed my 3" lift last week and yesterday put on my 15x8 wheels and 33x12.50 Duratrac's. Waiting for my Procal to make the tire change and tpms. Drove it around town and not bad, but sure it'll be a little better with the Procal.
Looks good.
07-12-2012 07:12 AM
DJ_B1R I installed my 3" lift last week and yesterday put on my 15x8 wheels and 33x12.50 Duratrac's. Waiting for my Procal to make the tire change and tpms. Drove it around town and not bad, but sure it'll be a little better with the Procal.



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07-12-2012 07:11 AM
ESP
Quote:
Originally Posted by 1quick1 View Post
Oh believe me I have and that's a lot of my reasoning behind the setup. I haven't checked it in a while but if I remember you were having some balancing issues. I'll need to check the latest on that one.
Yes I did and I don't run the duratracs anymore. I have mickey thompson MTZ currently and they balanced fine.
07-12-2012 07:04 AM
MacCTD Looks good, what size did you use on the Procal? From what I have read and used on my JK the actual tire size is often smaller than what is listed.
07-12-2012 05:19 AM
rtguy do they even have 4.10's for the jk dana 30? I haven't seen them. I take that back...I think mopar sells a set but I haven't seen any others. just 4.56 and up
07-12-2012 05:10 AM
Dozer13JK Good thread. Makes me feel okay about having 3.73's and going with 315/70/17's!
07-12-2012 12:53 AM
i82much Great thread.
07-12-2012 12:44 AM
pluke the 2 Good thread. 2012 Jkur here with 410s automatic and 37s no loss of power. Will regear to 538s when we buy 40s
07-12-2012 12:43 AM
Shodan01 Good Read - I am glad I have max towing with 373 though.
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