This site uses Akismet to reduce spam. 1. A loud rattling sound when in reverse. The 6L80 (and similar 6L90) is a six-speed automatic transmission built by General Motors at its Willow Run Transmission plant in Ypsilanti, MI. I think it is more of a software issue than a transmission problem. This is a much different transmission from the earlier generation 4L60/4L80/4L90E four-speed overdrives. The factory clutch apply piston has a sharp, square edge that does not completely apply force across the entire clutch piston. Thank you very much for any info! From what we saw when the trans were rebuilt the clutch material seems to be nothing more than a paper based friction material that also does not seem to be able to hold up to any converter failure. Remember to correct all existing codes in other modules before attempting to diagnose a transmission problem. … There’s also a line booster kit for the 6L80 trans that helps with improved line pressure. Hi there, I really could use your knowledge. Now that I've done my gm bashing, I do love my '12 silverado. 6L80 Transmission Problems - Hard Shifting and Lurching Discussion in 'Engine & Drivetrain' started by harbison, Jun 10, 2017. Posted on December 23, 2014 by circledtransmission • Posted in Uncategorized • Leave a comment. The Sonnax kit uses a redesigned piston and piston dam along with an upgraded base ring that applies much more even force across the entire clutch face for each clutch. Known issues include: Not shifting out of park. 6L80E Identification. Get 6L90 transmission rebuilding tips, 6L90 troubleshooting help, 6L90 technical service bulletins, 6L90 diagnostics and 6L90 technical information from TRNW. Which one you use is going to depend on whether or not the transmission is in or out of the vehicle. Re-Manufactured. If you have a service engine soon light on, it’d be a great place to start looking for your no 3rd or 4th gear problem. CASE STUDY: 2010 Chevrolet, Suburban, 1500, transmission problems. 6L80, 6L90, 6L95. Hey Jeff I have a2016 Chevy SS and I’m thinking about put?putting in the 7.0 550HP crate engine and supercharger it has the 6L80 transmission what transmission upgrades would be needed. There are two super easy ways to tell whether or not the transmission is a 6L80E. The following information is VERY important to understand and to perform the procedures correctly. If you’re having 6L80E transmission problems, you’re going to want the most economical solution. With even apply load, the clutches will hold much more torque without slipping. ? We did some investigating on this new line of 6-speeds and found that Sonnax is already on top of upgrading these transmissions. is it possible to install the newer module into this tranny? The pump assembly consists of the pump … Save my name, email, and website in this browser for the next time I comment. components in a previous rebuild of a 4L60E that is now running happily behind For those car owners that have 6R80 transmission, you may have been slightly alarmed if you notice something unusual with your car. Even … Your email address will not be published. It can’t hurt, and normally since I usually buy at 100,000+, fluid changes are something I do as preventative anyway. I personally drove a 2001 Yukon 425k before with never a hint of an issue and 2007 Tahoe 150k same result so this trans is a huge disappointment good luck with yours, check the fluid. All 6L90 questions answered by experts . You mentioned your trans is suffering from slipping that we will assume is delayed shifts due to slipping clutches. The only way to know for certain is to follow the diagnostic procedure as outlined by General Motors. Some people may seem to say that they have been experiencing several issues regarding the use of 6L80e transmission. Both of our trans had to not only have replacement torque converter but also clutch replacements. Mar 21 2018, 2:52pm. Paul Cummings wrote:I have a 2009 Sierra All Terrain with the 6.2 and the 6L80 trans. It features clutch to clutch shifting, eliminating the one-way clutches used on older transmission designs. Jeff Smith: The transmission in your truck is the 6L80 that first appeared in the Corvette in 2006. There’s also a 4-5-6 clutch boost valve that improves pressure apply to the clutches in these gears. I guess if you are looking at a gm product that is old and obsolete, they may have figured out, finally , how to build it. Friday, 12-4-2020, service manager called and told me they needed to change transmission fluid to fix problem and truck would be ready Monday,12-7-2020. I was thinking a 2010 Esclad(6l80E) only because the GVW would be close to the Jk. The 6L80E transmission is prone to issues that include: 2-3 harsh or delayed shifts, harsh or delayed shifts from park or reverse, burnt 1-2-3-4, or 3-5 reverse clutch, check engine light (DTC P0751 Code), converter shudder due to flaking of the converter lining, shudder on low/reverse apply, TEHCM and/or CAN software malfunction. Pictured below are just a few of the Updates & Upgrades that go into each 6L80E Transmission. Hello Jeff I’m hopeful that you will help help me understand what is happening with my 6l80 I have 14 model 1500 chev 4×4 and hit at around 124000 miles and the factory converter started sounding like it had a big oval shaped steel ball in it and bout to jump outta truck well turns out conv craped out and I replaced it with billet heavy duty direct replacement all’s well but now trans is fumbling lightly for 1st gear after other than that it shifts wonderful what do ya think thanks Joel. The GM Hydramatic 6L80 transmission heralds a significant change in the design of automatic transmissions at General Motors. We’ve worked with the Sonnax brand of transmission upgrade Constantly check fluid for burning and small metal fines before any long trips since that was obvious in the fluid when the converters failed. The 6L80 (and similar 6L90) is a six-speed automatic transmission built by General Motors at its Willow Run Transmission plant in Ypsilanti, MI. No matter what caused your 4L80E to lose third and fourth gear, good luck fixing it. The Best Quality. Oct 16 2016, 6:19pm. 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