Loud clunk and rough shifting into reverse when cold

[gobie18]

Hello, I have a 2018 supercrew that has 4k miles. I have been noticing that shifting into reverse is very rough and sometimes even a loud clunk when the transmission is cold. It only does it when cold, once warm then there is no problem. I was wondering if anyone here is having or noticing the same behavior. Thanks for any info.

 

[Raptorguy1]

I noticed it a few times. I didn't notice if it's because the revs are a little high and hadn't idled down yet. Mine has 525 miles on it.

 

[GCATX]

Maybe high idle when cold? I have about the same mileage on mine, it will jump a bit if I put it in gear right after starting cold. I generally try and wait a little bit for the idle to settle.

Edit, I totally missed the post above mine.

 

[jabroni619]

Mine engages reverse pretty aggressively when cold too. Not overly concerned with it. Smooths out once it gets even slightly warmed up.

 

[BajaLaz]

Just cold start cycle. Let truck warm up and drop rpms down.

 

[gobie18]

I will keep an eye out to see if idle is high tomorrow morning. Thanks for the info.

 

[gily25]

This happened to me 2 days ago

 

[Raptorguy1]

I paid attention to this today when I went out. When started, it was running at about 1300 RPM. After running for about a minute, it slowed down to about 800 RPM. When I put it into reverse, there was no harsh engagement.

 

[lifeline]

Unrelated to shifting into reverse while rpms are elevated but trans shifting related: There is a PCM update that has a very significant positive effect on the trans shift performance. I had a very abrupt 1-2 shift while in sport mode. So abrupt that I think it was only a matter of time before something broke. I updated the PCM and now it shifts very smoothly even in sport mode. You need to either visit a dealer or visit someone with IDS.

 

[gily25]

does it happen when its cold?

 

[GCATX]

Unrelated to shifting into reverse while rpms are elevated but trans shifting related: There is a PCM update that has a very significant positive effect on the trans shift performance. I had a very abrupt 1-2 shift while in sport mode. So abrupt that I think it was only a matter of time before something broke. I updated the PCM and now it shifts very smoothly even in sport mode. You need to either visit a dealer or visit someone with IDS.

I need this done. Is there a TSB or just ask dealer if there are any updates? Mine sometimes chirps the tires simply pulling away from a stoplight at granny throttle. 4-5 shifts rough too.

 

[lifeline]

I need this done. Is there a TSB or just ask dealer if there are any updates? Mine sometimes chirps the tires simply pulling away from a stoplight at granny throttle. 4-5 shifts rough too.

No TSB. Just go to the dealer and tell them about your trans issue. Tell them you know there is a PCM update that may resolve the issue and ask them to update your PCM. It should take them 10 minutes to do. The update takes only a couple minutes from start to finish.


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[rtmozingo]

It seems my 2017 has been doing this of late. Flat or incline, cold or hot, once per shift into reverse, usually when I toe in on throttle. Hoping it is spring clunk and not drivetrain related...

 

[1badjk]

I did the TSB when mine was shifting rough and it helped for a while and then the rough shifting started again. So I took the truck in and this time they replaced the valve body in the tranny. Good so far but only had it back for a few days.

 

[rtmozingo]

I did the TSB when mine was shifting rough and it helped for a while and then the rough shifting started again. So I took the truck in and this time they replaced the valve body in the tranny. Good so far but only had it back for a few days.

Wife says noise is coming from back left tire area, so thinking it is the suspension in my case.