Transmission shift issues
01-25-2023 | 09:06 PM
#1
Thread Starter
JK Newbie
Joined: Jan 2023
Posts: 1
Likes: 0
From: South Mills, NC
Transmission shift issues
I have a 2017 JKU with 4.56 gears and 37" tires. Since upgrading the gears and tires my transmission is not shifting properly. If you accelerate nice and easy, everything is fine but if you go more than say 1/4 throttle, I have to back off the pedal for it to shift. A friend has the same year JKU with 5.13 gears and his does the same thing. Tire and gear size has been changed using JSCAN.
01-26-2023 | 05:53 AM
#2
JK Jedi
Joined: Jun 2013
Posts: 11,009
Likes: 1,954
From: Willow Park, TX
Welcome to modified life 
If I'm really getting on it (like getting on the interstate) mine will hold 3rd gear for a long time before shifting. I don't notice it as much in other gears. Your 4.56 gearing is still a bit high for 37s, so that might not be helping. I've got 4.88s with 37s and have also had 5.13 with same tires with my 3.6L. The reaction in 3rd gear has always been the same for me from what I recall.
If I'm really getting on it (like getting on the interstate) mine will hold 3rd gear for a long time before shifting. I don't notice it as much in other gears. Your 4.56 gearing is still a bit high for 37s, so that might not be helping. I've got 4.88s with 37s and have also had 5.13 with same tires with my 3.6L. The reaction in 3rd gear has always been the same for me from what I recall.