Normal L8T noises?

Byrds8 · February 19

Believe its 10sp only. I have a whine also while driving or in park. Not sure where it's coming from but they didnt seem to concerned. If you take yours in and they fix it, let me know. Maybe I'll hit the back up and ask again. Mine has sounded like this since day one and it never gets louder or lessens the more it heats up. Its all a constant.

Another JR · February 20

1 hour ago, Pryme said:

Oh man I remember that sound from back in my car audio days. That would drive me up a wall. I don’t think this sound has to do with the 6spd. I’ve never heard it. Must be 10spd only?

My 2021 with the 6L90 does not make any noticeable noise I associate with the transmission. I’m only at 15k miles, though.

Pryme · February 20

17 hours ago, Another JR said:

My 2021 with the 6L90 does not make any noticeable noise I associate with the transmission. I’m only at 15k miles, though.

I’ve got 2k on ya. Two low mileage queens haha

AndrewF · February 20

On 2/18/2026 at 10:19 AM, Byrds8 said:

https://static.nhtsa.gov/odi/tsbs/2024/MC-11012007-0001.pdf

It has a few items on this list but about youre looking for the below portion.

Reaction Gearset Whine (Gearset One)

With variation in gear tooth finish and positional control, some customers may experience whine from the reaction

planetary gearset during light to moderate driving conditions.

Most common conditions to hear whine from the reaction gearset is in 4th and 5th gear (20-35 MPH) (32-56 KPH).

Reaction gearset is active in gears 3-6 and 8-10 so depending on severity it may be possible to hear in gears other

than 4/5.

Frequency of whine will change as transmission shifts gears due to component rotation speeds being changed.

Utilizing manual tap to shift through gears is a good way to verify what gears whine in present in.

Note: Whine from the reaction gearset should not be present in 7th gear due to the 1:1 ratio and gears being locked.

If whine is present in 7th gear, issue likely lives with some other component.

I’m not sure if I’m reading this right but the TSB seems to say that the trans shouldn’t make a noise in park? I think every 10L1000 I’ve seen (including mine) has a slight whine in park so I figured it was normal, but this TSB isn’t very clear.

BuckWallace · February 20

28 minutes ago, AndrewF said:

I’m not sure if I’m reading this right but the TSB seems to say that the trans shouldn’t make a noise in park? I think every 10L1000 I’ve seen (including mine) has a slight whine in park so I figured it was normal, but this TSB isn’t very clear.

I would think the reaction gearset noise (which is what I believe the noise I'm referring to is) shouldn't be heard in park. Only in the gears mentioned in the TSB.

Byrds8 · February 20

Beats me all the way around. Mine has a whine in park (assume it's the transmission) and has the planetary gear whine around 3rd and 4th up to about 38mph. It shifts fine and the dealership doesnt seem to worried about it so might as well ride it as is. I have wondered if it was just low on fluid because some have said theirs was but haven't bothered to check.

Byrds8 · February 21

5 hours ago, BuckWallace said:

I would think the reaction gearset noise (which is what I believe the noise I'm referring to is) shouldn't be heard in park. Only in the gears mentioned in the TSB.

The noise that can be heard in various gears is a separate noise than the one I can hear in park or slightly rolling through the neighborhood. The one for in park mentions it gets worse as it heats up. Mine is a constant. Never gets any less or more.