GDE Tune - Transmission Tuning

[ALeeL]

For those who have the emissions legal GDE tune with the transmission tuning. How do you like the shifting on the GDE transmission tune?

I currently have a transmission tune from someone else and it still holds 2nd gear way too long along with other things I do not like. It doesn't not feel like it was tuned for a diesel. I am asking GDE right now if they only sell their transmission tune for the Jeeps like they do for the Rams. Any input on the GDE trans tune would be appreciated.

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[Tread4Lo]

Funny you should mention this. When I replaced my battery, this seems to me when my Jeep starting holding the second gear way to long. It's strange though, as sometimes it will hold it till 2,500, then sometimes shift it at 1,700 (like other shift points). When it does hold it till 2,500, 3rd is short shifter and only a blimp on the dash.

Nothing else changed on the Jeep besides the battery too. I have stock trans tune as well. I am definitely interested in an answer.

 

[ALeeL]

Funny you should mention this. When I replaced my battery, this seems to me when my Jeep starting holding the second gear way to long. It's strange though, as sometimes it will hold it till 2,500, then sometimes shift it at 1,700 (like other shift points). When it does hold it till 2,500, 3rd is short shifter and only a blimp on the dash.

Nothing else changed on the Jeep besides the battery too. I have stock trans tune as well. I am definitely interested in an answer.

Same here, it doesn't do it all the time. Sometimes it shifts normal and sometimes it doesn't shift until 2,500 or higher even if I let off the throttle to try and force it to shift. It drives me nuts.

 

[cnapierala]

Funny you should mention this. When I replaced my battery, this seems to me when my Jeep starting holding the second gear way to long. It's strange though, as sometimes it will hold it till 2,500, then sometimes shift it at 1,700 (like other shift points). When it does hold it till 2,500, 3rd is short shifter and only a blimp on the dash.

Nothing else changed on the Jeep besides the battery too. I have stock trans tune as well. I am definitely interested in an answer.

I actually recall mine doing that for a bit after a full battery disconnect but it has gone away.

 

[Ratbert]

Does the behavior change after everything heats up?

 

[ALeeL]

Does the behavior change after everything heats up?

Unfortunately, no. That is what I thought when it happened the first time, but then it kept happening even with the trans being at operating temp.

 

[Tread4Lo]

Same. Operating Temp doesn't seem to have any effect. Throttle input doesn't either (light or heavy throttle) will get the higher revs.

 

[RicRecon]

Since you’ve disconnected the battery, is it possibly relearning shift points by chance?

 

[Tread4Lo]

Possibly. I don't know how long that normally takes. It has been 2 months (purchased battery November 25, 2024). I didn't record what the mileage was, at the time. I probably don't have 1,000 miles since I changed the battery though. I have deleted the aux battery earlier last year, but removing that I never noticed this funky second to third shift.

 

[Terpsmandan]

Mine seems to hold gears longer when cold but smooths out when warmer. It does like to hold third gear at around 30 around town and seems like it wants to up shift bit doesn’t. Not a big issue and I prefer it to stock. Wife has one without a tune so I can get a good contrast between stock and GDE.

 

[rarefied.air]

Mine seems to hold gears longer when cold but smooths out when warmer. It does like to hold third gear at around 30 around town and seems like it wants to up shift bit doesn’t. Not a big issue and I prefer it to stock. Wife has one without a tune so I can get a good contrast between stock and GDE.

To further elaborate on this, I am not the greatest fan of the holding of gears longer to warm up faster. Which I think is the cause of this. Or as they put it on their website: "Revamped warm-up mode scheduling to provide faster engine warmup".

Seems anytime everything is cold and below 40F, initial shifts are noticeably higher. 1/2 transition is ~2.2K, 2/3 is ~2.4K, and 3/4 is ~2.1K rpm. Oil pressure is HIGH during all this, usually around 75-80psi. When it's real cold, I usually shift "manually" until it warms up, to keep rpms and pressure down.

If I had to guess, this is probably emissions related, where their tune requires the increased operating temps to be compliant. During this time, I seem to notice an increased DEF consumption, via smell (subjective...yes).

 

[ALeeL]

To further elaborate on this, I am not the greatest fan of the holding of gears longer to warm up faster. Which I think is the cause of this. Or as they put it on their website: "Revamped warm-up mode scheduling to provide faster engine warmup".

Seems anytime everything is cold and below 40F, initial shifts are noticeably higher. 1/2 transition is ~2.2K, 2/3 is ~2.4K, and 3/4 is ~2.1K rpm. Oil pressure is HIGH during all this, usually around 75-80psi. When it's real cold, I usually shift "manually" until it warms up, to keep rpms and pressure down.

If I had to guess, this is probably emissions related, where their tune requires the increased operating temps to be compliant. During this time, I seem to notice an increased DEF consumption, via smell (subjective...yes).

Great post and just what I was looking for. Seems that I will not get the GDE trans tune if this is the case because I am trying to get away from high rpms especially after a cold start. I also manually shift after a cold start up to keep rpms as low as possible to keep engine wear to a minimum.

 

[CO2Wrangler]

GDE tune and transmission tune here - it holds second quite a while when cold but I just try to keep the oil pressure under 80 and not think about it too much.

GDE basically told me not to run their tune without the transmission tune. I'm inclined to believe that's the smartest course of action.

 

[Terpsmandan]

Pretty sure the transmission talks to the engine to remove the torque limiter that FCA has in the stock tune.

 

[CO2Wrangler]

Pretty sure the transmission talks to the engine to remove the torque limiter that FCA has in the stock tune.

This is what I suspect as well, especially since they explicitly call out the FCA pulling of the torque curves in specific gears in the graph they provide on their site.

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