Re geared. Jeep in limp mode. Please Help!!
01-04-2014 | 05:47 AM
#11
Thread Starter
JK Enthusiast
Joined: Mar 2008
Posts: 442
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From: Bangor Maine
I'm getting ready to have 4:88s installed in my 13 next week and I have the procal already but how does the jeep even know there are different gears installed I guess if you have a auto it would screw up the shift points but with my manual trans if not sure it would effect anything... Guess I better reprogram it befor I take it for a ride.
01-04-2014 | 06:59 AM
#12
JK Enthusiast
Joined: Jun 2012
Posts: 152
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From: Florida
I've been curious about that as well. I went ahead and reprogrammed for my 4.88 gears on my 6 speed, but the instructions seem to indicate it's only necessary to correct shift points on an auto.
01-04-2014 | 07:08 AM
#13
JK Newbie
Joined: Dec 2013
Posts: 25
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From: Charleston SC
Ive done gears in a few 12 & 13s, all manuals and never had any issues, gears in my 08 auto didn't cause any problems either.
I'm guessing with an auto it could be seeing the tranny spinning at one speed and the wheel speed sensors spinning faster then they should so it thinks something is wrong. If that's the case the procal will fix it. It doesn't matter that you've driven it.
Driving it in limp mode wont hurt it, as long as you don't rev too high for long.
I'm guessing with an auto it could be seeing the tranny spinning at one speed and the wheel speed sensors spinning faster then they should so it thinks something is wrong. If that's the case the procal will fix it. It doesn't matter that you've driven it.
Driving it in limp mode wont hurt it, as long as you don't rev too high for long.
01-04-2014 | 08:50 AM
#14
JK Enthusiast
Joined: Sep 2011
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From: American Canyon, CA
01-04-2014 | 09:25 AM
#15
JK Enthusiast
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From: Florida
01-04-2014 | 09:59 AM
#16
JK Newbie
Joined: Dec 2013
Posts: 25
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From: Charleston SC
The computer is programmed to know if the rear spins say 3.21 times for one rotation of the tire, when you regear its now spinning say 5.13 times for a rotation, but the computer has no way of knowing that so it thinks the tires are spinning more then once.
01-04-2014 | 10:00 AM
#17
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From: Billings, MT
01-04-2014 | 10:39 AM
#18
JK Super Freak
Joined: Feb 2012
Posts: 1,087
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From: Parker, Colorado
Wheel speed is reported from the wheel speed sensors.
The auto needs to have the gear ratio programmed so the shift points and engine rpm is in harmony.
On the manual transmission JK there's no need to program the gear ratio.
The auto needs to have the gear ratio programmed so the shift points and engine rpm is in harmony.
On the manual transmission JK there's no need to program the gear ratio.
01-04-2014 | 10:59 AM
#19
JK Newbie
Joined: Jan 2013
Posts: 58
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From: Tempe, Arizona
With an automatic, reprogramming is necessary for the or react shift points, speedo and traction control/ESP issues.
The manual only requires programming to correct speedo and traction control/ESP. Not really required, but I would do it because it may still help drivability issues.
My automatic was not too bad going from the factory steelies to the factory alloys but when I reprogrammed it with my Bullydog tuner, it did change the shift points and correct the speedo. Noticeable difference on the street.
The manual only requires programming to correct speedo and traction control/ESP. Not really required, but I would do it because it may still help drivability issues.
My automatic was not too bad going from the factory steelies to the factory alloys but when I reprogrammed it with my Bullydog tuner, it did change the shift points and correct the speedo. Noticeable difference on the street.
