Reset the computers

[JTGuy]

Just wondering if I disconnect the batteries if that will reset the trans computer and possibly cure the cold reverse clunk issue?

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[Hootbro]

It will reset the adaptive learning. How much of that is for the reverse gear, I would say is minimal to zero. I would still do it for the data point though.

 

[JTGuy]

The dealer said he will do a re flash for me that could possibly resolve the reverse clunk issue but that requires a taser remove. Un marry, re move, re install, re marry, re prog the taser . A real PITA

 

[Hootbro]

The dealer said he will do a re flash for me that could possibly resolve the reverse clunk issue but that requires a taser remove. Un marry, re move, re install, re marry, re prog the taser . A real PITA

Well, a reflash is different that doing a memory reset if the reflash is pushing new software that addresses the issue.

That has always been the tradeoff in having a Tazer is the dealership visits and software reflash.

 

[JTGuy]

I am grasping at straws. Hoping for something that works as there has been no answers here.

 

[DylanM]

If you're just grasping at straws, try shifting into neutral or drive for 5-10 seconds before going to reverse. Another thought would be to back in where you plan to park at the end of the final drive for the day -- the transmission can't cold reverse clunk if you don't use reverse when it's cold.

 

[jav_eee]

Mine clunks if I don’t give it a chance to idle down after a cold start. How quick are you putting it into reverse?

 

[ShadowsPapa]

Mine clunks if I don’t give it a chance to idle down after a cold start. How quick are you putting it into reverse?

Mine will as well - might start out at 1200 RPM and slowly drop from there.

However, I back into the garage and NORMALLY, with the slop of everything, there's no slack to take out when I put it in D to drive out of the garage. I have found, depending on how I park, it can be worse or better, but reverse usually gets the bigger one.
Mine has never been anything abnormal, though - not in any of the Jeeps I've had/driven.

These do actually track how fast the clutch packs fill, and when they are full - so if they are talking flash, could be there is something changed about that part of it. These aren't like they old days where the valve directs fluid into a clutch pack and it never knows if it applied or not, or when it's full, etc. - these know, these count the time to fill the clutch pack and apply it, to the point of certain pressures.

 

[JTGuy]

I drive into my garage. In the morning I start it and let it idle down to around 600. Then put it in D, nothing, then N, nothing, then D again and P. Then the R and I get a clunk . One time, then back to D and back to R again and no clunk. It's just the first time going into R that clunks. Only when cold or it's sat a while to cool down or drain .. Didn't do it when it was new. It's definitely in the trans and I think it's caused by an electronic issue. It shifts normal other than that with no noises. I have checked the trans fluid level OK. I have never towed or overheated it.

 

[dylanhack]

I think the "sometimes clunck, sometimes not" is par for the course. I currently have a 2023 Wrangler and Gladiator with similar issues. I also had a 2016 Charger Hellcat (8-speed auto) and 2005 Magnum RT (5-speed auto) with the same issue. The torqueflite transmissions are all related to each other and in some cases the Jeep 3.6L 8-speed is also the exact same tranny as the newer Charger 8-speed (non-Hellcat ). I've owned Dodge's since 2005, so when I felt that occasional odd reverse cluck in my brand new 2023 Jeeps, it had that warm comfy blanket feeling again.

I used to worry about the clunk, But I've not had any transmission issues in the last 20 years. Hopefully its the same experience for you.

 

[JTGuy]

It does the clunk every time, first time going into R when cold. A solid clunk. It can't be good for something .

 

[ShadowsPapa]

I drive into my garage. In the morning I start it and let it idle down to around 600. Then put it in D, nothing, then N, nothing, then D again and P. Then the R and I get a clunk . One time, then back to D and back to R again and no clunk. It's just the first time going into R that clunks. Only when cold or it's sat a while to cool down or drain .. Didn't do it when it was new. It's definitely in the trans and I think it's caused by an electronic issue. It shifts normal other than that with no noises. I have checked the trans fluid level OK. I have never towed or overheated it.

I was wondering if it was just taking out the slack until you posted the above - you showed that it only did it the first time, and that going into D and P, then going to R again did not clunk once it had already done it.
That would have been my test - can you add slack to things like the pinion/ring gear lash, and clearances in other areas and force it by going the other way, taking out the slack the other direction, then trying again.
It didn't work that way as you seem to have shown in the above.
If you had been able to cause it to happen by parking at different angles, going between D, N, P and so on, then to R, that would have been drivetrain clearances all being taken out with a clunk.

 

[JTGuy]

This is not gear lash or drivetrain slop. It's a click or clunk inside the trans, only the first time.

 

[djthumper]

The dealer said he will do a re flash for me that could possibly resolve the reverse clunk issue but that requires a taser remove. Un marry, re move, re install, re marry, re prog the taser . A real PITA

It is not that bad. This isn't a bad option if you are just grasping at straws.

 

[HueCity0846]

On a cold start, first put the tranny in neutral until the idle rpms drop. No clunks when I do this.

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