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09-30-2021, 11:50 AM | #1 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,507
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6l90 trans TC question
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?
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban Last edited by mtdave2; 09-30-2021 at 01:29 PM. |
09-30-2021, 12:17 PM | #2 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,507
|
Re: 6l90 trans TC question
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
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban Last edited by mtdave2; 09-30-2021 at 01:13 PM. |
10-03-2021, 04:21 AM | #3 |
Registered User
Join Date: Mar 2014
Location: Corvallis, OR
Posts: 711
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Re: 6l90 trans TC question
What issue are you referring to?
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1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205 1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears 1996 Chevy Suburban K1500 350/4L60E |
10-04-2021, 10:18 AM | #4 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,507
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Re: 6l90 trans TC question
the TC slips and sends the material through the trans.
https://www.sonnax.com/tech_resource...r-next-rebuild
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
10-04-2021, 03:44 PM | #5 | |
Registered User
Join Date: Mar 2014
Location: Corvallis, OR
Posts: 711
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Re: 6l90 trans TC question
Quote:
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.
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1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205 1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears 1996 Chevy Suburban K1500 350/4L60E |
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