6l90 trans TC question

[mtdave2]

I have recently learned about the issues with the torque converter in the 6l80/90

did chevy fix the issue in later years? meaning is there a date range where you should swap the TC out when doing an install?

is they have not. what is the recommendation for a TC that will prevent that problem? I have a swap ready to go in the truck, this is the time to swap it if I need to. the donor 2018 with 9k miles on it, so id rather leave it alone.

perhaps an inline filter to the cooler?

[mtdave2]

I did notice the TC part number did change in later years, 2014 or so?

24245962 vs 24217235 express vans

29549522 for 2008 Silverado
24245962 for 2010 Silverado

[87Skier]

What issue are you referring to?

[mtdave2]

the TC slips and sends the material through the trans.

https://www.sonnax.com/tech_resource...r-next-rebuild

[87Skier]

Originally Posted by mtdave2

the TC slips and sends the material through the trans.

https://www.sonnax.com/tech_resource...r-next-rebuild

Thanks for the link. One aspect Sonnax didn't discuss is programming on the torque converter. I have HP tuners and have messed with the 6L90 and 4L60. The configuration of the 4L60 is significantly easier with many fewer options. For example, the 4L60 uses a TCC duty cycle, whereas the 6L90 uses a desired slip RPM.

When I did my swap in 2017-2018 I bought a 6L90 with about 50,000 miles on it and noticed a significant amount of clutch material in the pan and tore down the entire transmission checking the rest of the clutches. I ultimately decided to replace the torque converter because everything else looked good.

To alleviate some clutch wear I changed how the torque converter is used during driving. I completely disabled it in 1st and 2nd gears, and reduced the amount of desired slip under normal driving. I bumped up the pressures for the rest of the gears. I also disabled it completely under high load and high RPM situations. Most of the changes I made were from recommendations of the HP tuners forum.

I have put about 15k to 25k miles on it since the swap, so I haven't had the pan off yet to determine if the changes I made have resulted in less torque converter wear.

If I were you I would probably keep what you have in there. I also wouldn't bother with an inline filter because once the torque converter friction material is gone, it's metal on metal and the filter won't help. I would just keep an eye on the amount of friction material in the pan during regular servicing and if it is excessive consider replacing the torque converter after 100k miles.