Automatic Transmission Issue

[Pape]

Happened to me, usually when cold for the first shift from 3 to 4.
Typical long 3 and slam in 4. Went this happen I usually ease up on gas and it is mostly normal shift. Feel to me like a combination of factor and one of them is about temperature.

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[Jeepjoy]

Happened to me, usually when cold for the first shift from 3 to 4.
Typical long 3 and slam in 4. Went this happen I usually ease up on gas and it is mostly normal shift. Feel to me like a combination of factor and one of them is about temperature.

Good point. Correct me if I'm wrong but I think we all paid an extra 4500$ for an automatic transmission. To perform a workaround by letting off the gas to help it shift, cold transmission or not, is not the fix. I can't think of anything I would buy for that price and not expect it to work perfectly. Maybe the techs need to drive a new vehicle with a properly shifting transmission and then drive the problematic ones. ?

 

[John Galt]

I had a chat with a friend at ZF and he told me that one possibility could be, that the engine management and gear management work to bring the temperature of all components up to normal operating conditions as efficiently as possible. When cold starting, this could involve holding lower gears slightly longer than when at temperature. He also said that a noticeable clunking should be investigated and should not be seen as normal.

 

[Pape]

Good point. Correct me if I'm wrong but I think we all paid an extra 4500$ for an automatic transmission. To perform a workaround by letting off the gas to help it shift, cold transmission or not, is not the fix. I can't think of anything I would buy for that price and not expect it to work perfectly. Maybe the techs need to drive a new vehicle with a properly shifting transmission and then drive the problematic ones. ?

I do not expect perfection in this world. To be honest the issue showed up on the first cold and only when I take a specific route. What is also interesting to note is the issue is less of a problem now. I did have some bad clunking in the first couples K but this is all gone now, ya driveline easing up. One day they will come back and at that point it will be from wear

For sure I do not say that they cannot fail and need to be look at.

 

[Dharc]

I Recently purchased a 24 JLUR with 3.6 engine and 8 speed automatic transmission in March 2024. I have already taken it in to the dealer and of course was told working as designed and they reset the transmission. I have had the IDENTICAL issues as the original post…Hoping for any further help. See copy and paste below…”The Jeep has about 400 miles on it now. I’ve noticed a rough change of gears between 3rd and 4th gear at slow speeds. It has become more noticeable the more miles I’ve have driven. It almost seems that it hangs in 3rd gear too long which causes the rough shift into 4th gear. I have an appointment March 1st, to get it looked at, but was curious if anyone else has experienced the same issue and if so, what if anything has fixed it. It has no issues if I am changing gears when accelerating at faster speeds, usually happens under 30mph. Appreciate any input.”

 

[mwilk012]

I Recently purchased a 24 JLUR with 3.6 engine and 8 speed automatic transmission in March 2024. I have already taken it in to the dealer and of course was told working as designed and they reset the transmission. I have had the IDENTICAL issues as the original post…Hoping for any further help. See copy and paste below…”The Jeep has about 400 miles on it now. I’ve noticed a rough change of gears between 3rd and 4th gear at slow speeds. It has become more noticeable the more miles I’ve have driven. It almost seems that it hangs in 3rd gear too long which causes the rough shift into 4th gear. I have an appointment March 1st, to get it looked at, but was curious if anyone else has experienced the same issue and if so, what if anything has fixed it. It has no issues if I am changing gears when accelerating at faster speeds, usually happens under 30mph. Appreciate any input.”

Drive it more.

 

[Dharc]

Drive it more.

Thanks…I have already driven it over 1,500 miles in about 3.5 weeks. Plan to keep driving and putting on miles. I love Jeeps and this is my 6th Wrangler (4th JL). The others were quite smooth. This one performs differently. I will see what the dealer says again on Friday.

 

[mwilk012]

Thanks…I have already driven it over 1,500 miles in about 3.5 weeks. Plan to keep driving and putting on miles. I love Jeeps and this is my 6th Wrangler (4th JL). The others were quite smooth. This one performs differently. I will see what the dealer says again on Friday.

They will blow you off unless you have a really good relationship with them.

 

[PJM86]

I recently took my Jeep back to dealer and it has been determined that it needs a new valve body for the transmission. They are ordering one and will let me know when they have it. I will then drop my Jeep off again to get it fixed. I will post once the work is done and let you all know if it is fixed.

 

[HipCheck]

Recently purchased a 24 JLUR with 3.6 engine and 8 speed automatic transmission in January 2024. The Jeep has about 400 miles on it now. I’ve noticed a rough change of gears between 3rd and 4th gear at slow speeds. It has become more noticeable the more miles I’ve have driven. It almost seems that it hangs in 3rd gear too long which causes the rough shift into 4th gear. I have an appointment March 1st, to get it looked at, but was curious if anyone else has experienced the same issue and if so, what if anything has fixed it. It has no issues if I am changing gears when accelerating at faster speeds, usually happens under 30mph. Appreciate any input.

I have this exact issue with a 24 JLUR V6. I'm hoping it's adaptive shift strategy learning before calling the dealer. Have 800 miles on it, but my 2018 didn't have any shift issues like this.

 

[alphawolff]

with that low of mileage, the adaptive shift strategy hasn't even learned yet.

All the transmissions are quick learned before they leave the factory. The adaptive shift strategy thing is really overblown. They learn themselves within a drive or two. assuming you make it through all the gears. Not sure why this myth is still thrown around, at least for our products

I recently took my Jeep back to dealer and it has been determined that it needs a new valve body for the transmission. They are ordering one and will let me know when they have it. I will then drop my Jeep off again to get it fixed. I will post once the work is done and let you all know if it is fixed.

Yeah, generally this type of thing has three possible fixes. Update the software (if available) and perform a quick learn. If it still happens replace the valve body. If it still happens again replace the transmission. We don't really work on the 8/9 speeds internally

 

[PJM86]

All the transmissions are quick learned before they leave the factory. The adaptive shift strategy thing is really overblown. They learn themselves within a drive or two. assuming you make it through all the gears. Not sure why this myth is still thrown around, at least for our products




Yeah, generally this type of thing has three possible fixes. Update the software (if available) and perform a quick learn. If it still happens replace the valve body. If it still happens again replace the transmission. We don't really work on the 8/9 speeds internally

Thank you for the info.

 

[mwilk012]

All the transmissions are quick learned before they leave the factory. The adaptive shift strategy thing is really overblown. They learn themselves within a drive or two. assuming you make it through all the gears. Not sure why this myth is still thrown around, at least for our products




Yeah, generally this type of thing has three possible fixes. Update the software (if available) and perform a quick learn. If it still happens replace the valve body. If it still happens again replace the transmission. We don't really work on the 8/9 speeds internally

This is just complete misinformation.

It also just looks terrible that factory techs don't actually know how to or care to try to fix their products, they just swap parts out until it works. It's no wonder valve bodies are so much more expensive than other brands, getting wasted like that.

 

[alphawolff]

This is just complete misinformation.

It also just looks terrible that factory techs don't actually know how to or care to try to fix their products, they just swap parts out until it works. It's no wonder valve bodies are so much more expensive than other brands, getting wasted like that.

No. This is literally our diagnostic and replacement routine from Stellantis. Under no circumstances are we to tear down these transmissions for any warranty concern like our older corporate units.

If there's a shift concern and the fluid is full without no external circuit issues it's quite literally a quick learn, then valve body, then unit replacement.

Again, this is from Stellantis. The ZF 8 speed is totally rebuildable, but we don't do it because they tell us not to.

 

[mwilk012]

Again, this is from Stellantis. The ZF 8 speed is totally rebuildable, but we don't do it because they tell us not to.

I know, and it is completely fucked.

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