Can anyone help me?

[D.R.Davis]

It’s a 2018 JL Wrangler with a 3.6 L and the eight speedautomatic transmission

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[D.R.Davis]

Should I just go to a dealer and have them flash the tire size and gear ratio?

 

[MntGoat]

So, with no tuner connected or ecm flash, you can't drive it and get into high gear at say 65mph?

 

[MntGoat]

With 4:10 I can get the wife's into 8th at with 33's and mine will go into 8th on level ground with 37's.

With 4:88 it would happen way earlier.

What does it do differently now after gear change...be specific

 

[D.R.Davis]

So as of now, it will go through all the gears to sixth gear kind of winds out in six gear at a 50 miles an hour. It takes a while to shift into seventh say it around 60.
at times say I’m going down an incline it will go through all the gears quickly to 7th once I start going uphill it starts down shifting to sixth and stays there
When I am slowing down, I can feel the downshifts at times it can feel pretty aggressive Like it’s being really hard on the transmission

 

[D.R.Davis]

I bought the Jeep for my wife brand new in 2018. We very rarely drove it just here recently. I started driving it as my everyday drive has 53K miles When I started driving it every day before the re-gear it would never reach eighth gear very rarely so that’s why I thought I needed to re-gear but never had any of the downshifting issues

 

[eastern]

Reading this thread is like watching a blind trying to find a deaf to talk to.

 

[2nd 392]

So as of now, it will go through all the gears to sixth gear kind of winds out in six gear at a 50 miles an hour. It takes a while to shift into seventh say it around 60.
at times say I’m going down an incline it will go through all the gears quickly to 7th once I start going uphill it starts down shifting to sixth and stays there
When I am slowing down, I can feel the downshifts at times it can feel pretty aggressive Like it’s being really hard on the transmission

A couple guesses, the more performance oriented tuner used could be changing shift points and shift times like a “sport mode”. … also unless it’s changed the dealer can’t recalibrate for gears and tires. At a cost you could set it back to stock and use a Tazer, j-scan, or other.

 

[D.R.Davis]

So, with no tuner connected or ecm flash, you can't drive it and get into high gear at say 65mph?

No it will mot

 

[Wabujitsu]

I think I screwed my jeep up. I had it re-geared to 488 gears I run 35 inch
Nitto Ridge grappler the people who re-geared it had me use Flashcal F5 to tune it. I have reset it multiple times and I either have very aggressive down shifts or I can’t even hit eighth gear. I have a 4 inch lift I have no idea what to do

Personal thought: 4.88 seems marginally appropriate for 35s. 4.10 works very very well.

 

[eastern]

Do you think that I may have selected the wrong gear ratio for my tires? Maybe I should’ve went with 456 instead of 488

3.45 is the only way to go, and you will be amazed at how it performs on 37s
Take it back, tell em you want numerically lowest ratio possible

 

[Ratbert]

3.45 is the only way to go, and you will be amazed at how it performs on 37s
Take it back, tell em you want numerically lowest ratio possible

Sarcasm, right? Hopefully?

 

[Jeeps2Little]

Oops.. reading comprehension failed....

message deleted

 

[Ratbert]

I can't believe AEV charges $225 for the limited things that the ProCal does. I just wasted 20 minutes reading this thread and their manual. I was going to ask the OP if he was actually changing the GEAR RATIO and not trying to do something with the transmission relearn (that you can get to with JScan, etc) or some other setting/parameter....but ProCal doesn't do squat! Tire Size, Axle Ratio, Transfer Case ratio, TPMS, clear codes and a factory reset......that's it.

Personally, I would return the ProCal and get the JScan app on your phone, approved gateway bypass cable and OBDII Bluetooth dongle. A hell of a lot more useful and not tied to just one vehicle. It shows you the actual current values for any setting. I have used it for clearing code, trouble shooting, tire size, TC, axle gearing, fog lights, LED lights, ABS brake bleed, stereo/HVAC upgrade and on and on.

You can use Torque app with the BT dongle for other vehicles to see/clear codes, etc. Ford Trucks have Forscan and other makes have other software that use the OBDII BT dongle for connection.

FlashCal, not ProCal.

 

[mwilk012]

If the “flash didn’t take” you would have numerous faults active for wheel speed errors.

Cruising at 70 mph, what is your engine RPM and what gear does it maintain?

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