My 6L90 transmission in my 2008 Chev Suburban has 280,000 miles. It currently functions fine but I want to be prepared with a plan if it eventually needs rebuilding. I came across this You Tube video from National Transmission. National has several shops in Calgary, Alberta which is probably where I would take it to get rebuilt, come that day. I noticed that some of the info has already been recommended by @clinebarger who has posted several times, helping people with questions about these transmissions. Anyway, it's 7 minutes long and contains some pretty useful info on where are the trouble areas and how to improve on the transmissions when getting rebuilt. Enjoy.
www.nationaltransmission.ca
How we Fix GM Transmission Failure (6L80 & 6L90)
If you have a GM Truck or Van with a 6-speed transmission, built after 2006, these issues are likely to affect your truck. If you tow/haul frequently, or need to ensure as little down-time in your…
www.nationaltransmission.ca
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