Transmission Clunk TSB L-SB-0042-25 (1 Viewer)

[cmfhsu]

I’m also experiencing the harsh downshifting when coming to a stop. Just called to make a 5k service appointment and was told that the tsb doesn’t apply to my 2025 gx. Am I just out of luck?

What TSB number did you reference when calling? You need to ask for L-SB-0042-25, not the earlier L-SB-0036-24, which is now closed and deprecated.

My July 2025 production GX got the updated calibration no problem, but it didn't fully solve the harsh downshift. I suggest lubricating the driveshaft slip yoke (especially) and u-joints - it makes a much bigger difference for harsh downshifting, and comes with the bonus of significantly smoother driving in general.

 

[Reef Surfer]

Thank you. I'm not 100% sure of the build date. I took ownership in August 2025, so probably a couple months prior to that. When I called service I offered several times to provide the TSB that you mentioned but they wouldn't take it. The guy entered my vin on his side and said that no TSB's came up.
I saw a couple people recommend greasing the driveshaft and will definitely give that a go.