No placebo effect – initially for a couple hundred miles it was much better. Radio Programming – Calibrations or Software. There’s not issue when intermixing the two fluids. Low transmission fluid level - One of the most common issues that prevent a GMC vehicle from shifting when placed in the Drive (D) ... GMC vehicles with 8-speed 8L90 and 8L45 transmission have a widespread problem known as ‘Chevy shudder.’ The symptoms that may happen during gear shifts and typically include shaking, juddering, and harsh shifting. The quality and craftsmanship we put into every built transmission we upgrade is regarded as "the best in the business" in both performance and value for your money. (Fig. On my dash, if in tow … Come back a fourth time and we’ll take care of it. $2,700.00. Automatic Transmission 8L90 – The Other 8 Speed Automatic (General Motors’ very own production transmission) One example of how time flies by is the fact that there has been an eight-speed automatic transmission on the road since 2007. • The 8 speed architecture utilizes a chain driven fluid pump. 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The use of the black label Mobil 1 Synthetic LV ATF HP fluid (GM Part Number 19355656) should be discontinued. the Mobil 1 rep told him that there is no difference between the black label product and the blue label product. sions; 8L45 & the 8L90. There are three different fluid exchange procedures to follow, depending on vehicle application, so that an acceptable concentration of the new HP fluid is achieved in the transmission. TechPRO ProfessionalAftermarket Diagnostics, The EL-52545 TPMS and RF tool offers the ability to quickly identify a key fob (Fig. All Rights Reserved. By Brian T. Murray, Esq. DT-51190-A Transmission Oil Fill Adapter The 6L50, 6L80, 6L90, 8L45, 8L90, 10L60, 10L80, & 10L90 transmissions from MY2015 to current are filled through a port in the bottom of the oil pan. It’s also cold here in ohio now so I’m likely to feel that the shudder is probably not happening at the moment. The TCM is a standalone Delphi unit which is shared with several other GM applications such as the 9T, and 10L transmissions. A new transmission fluid exchange procedure and a new formula of Mobil 1 Synthetic LV ATF HP transmission fluid have been released to address torque converter clutch (TCC) shudder conditions on 8L45 and 8L90 8-speed automatic transmissions (RPOs M5N, M5T, M5U, M5X) in some 2015-2017 Escalade, Yukon; 2015-2018 Silverado, Sierra; 2015-2019 Corvette; 2016-2018 CT6; 2016-2019 ATS, CTS, Camaro; and 2017-2019 Colorado and Canyon models. Transmission repair manuals 8L90/8L45. The GM part numbers are not on the product. The 8L90 transmission is an 8-speed longitudinal automatic transmission that was designed to shorten the steps between gears and improve fuel economy beyond the 6L80 and 6L90 transmissions. The height of the standpipe tube attached inside the transmission to the bottom of the pan sets the oil level. Chevrolet Performance has adapted the production-based 8L90-E eight-speed automatic transmission for use with our LT1, LT4, and LT5 crate engines. When GM developed the 6L80/6L90 transmission series, they were loosely based upon the ZF 6HP family of transmissions. I’m confused on this new fluid and need some help. No metal in the filter, nothing on the magnets.Any ideas what is causing this? The new bottles also feature the HP license number J-62120 on the back label. Duplication of a customer condition can vary from vehicle to vehicle and can also be influenced by environmental conditions. It is a hydraulic (hydramatic) design. The new fluid (19417577) has a new GTL (Gas to Liquid) base stock that is able to tolerate more moisture. That is why TSB #18-NA-355 is requesting a screen print of either a GDS2 Session showing TCC slip, GDS Special Functions showing TCC Locked, or a PicoScope screen print showing TCC shudder (vibration frequency). By 2014 GM released the 8L90 in the Cadillac ATS. This was more so on the 2016 models which switched to a 1 piece hardness that encompassed the sensor. It is not recommended to use any aftermarket fluid exchange machines. For a video demonstration of the new fluid exchange procedure, check out the December 2018 Emerging Issues Broadcast, course number 10218.12V, available through the Center of Learning. A sudden change in fluid temperature (50?F or more within 8 seconds) will cause P0711 to set. GM’s Dangerously Defective Hydra-Matic 8L90 and 8L45 Transmissions. It is designed for use in longitudinal engine applications either attached to the front-located engine with a standard bell housing or in the rear of the car adjacent to the differential (as in the Corvette). The new service procedure addresses shake and/or shudder conditions during light throttle acceleration between 25 and 80 MPH (40 and 128 KM/H) at a steady speed when the transmission is not shifting gears. Remove transmission pan and drain transmission fluid again. Can you use another transmission flush machine. A screen print from GDS 2 or the PicoScope showing the TCC shudder event must be attached to the Repair Order hard copy. In the meantime, General Motors has issued service bulletins to address the problem. With these applications, when making a gear change a clutch is typically going to be released while another … We have never experienced any ourselves. 26) come into the dealership with various system concerns – the radio display […]. General Motors believes that the answer is to do a transmission fluid service to replace the original Dexron VI transmission fluid with a newer low viscosity fluid. Operate vehicle on hoist for 10 minutes. The product code and license number are correct. Fluid in this new trans looks perfect as it has 25 miles on it. 10) The tool kit began shipping to dealerships at no charge in late January 2019. GM Part Numbers for 0.946 liter bottles will be provided at that time. Constant throttle input on a smooth grade is needed. Buy now and get free shipping from Global Transmission Parts The Mobil 1 Synthetic LV ATF HP transmission should only be used in the 8L45 and 8L90 Automatic Transmissions. The new fluid exchange procedure requires the use of the DT-45096 TransFlow Cooler Flush Machine and DT-52263 Transmission Fluid Exchange Tool Kit. I have to agree with Jason Glover on this you only make the customer come back so many time and then they don’t come back at all, and as for the snap shot of the shudder that’s just a way for gm to charge it back to the dealership if its not done to what they like to see, anyone that’s been working on transmissions for any amount of time know what a convertor shudder is. M5U. Each clutch has a solenoid to control its operation. I want to thank you in advance for your assistance in this matter. small bar label # 1247148000 Posted on November 4, 2019. 12) in most locations. 8L90 TKR. Seven solenoids control pressure regulation, while the other two — solenoids 8 and 9 — are on/off, normally low solenoids. Anyone have theirs successfully serviced? This information is vital to me being 1 OF 2 trans builder for GM dealerships in the Permian Basin area. Can this new oil be mixed with the oil say in a filter change on a truck that did not have a convertor shudder but is just having a trans service. New transmission fluid tests have been developed due this issue to prevent it from occurring with new transmission fluids. This problem currently affects 11 different models across 3 different OEM manufacturers between the model years 2015 and 2019. I can't see where it would be any different than the rest of the GM transmissions. These transmissions use nine solenoids to control transmission operation. 8L90 Transmission parts. Currently, GM offers two models of eight-speed transmissions, the light-duty 8L45 and heavy-duty 8L90. The 8L90 is found in GM high-horsepower vehicles highlighted by the Corvette and common daily driven vehicles like the Yukon and Silverado. If you are driving one of the hundreds of thousands of vehicles recently manufactured by General Motors, LLC (“GM”) you may be at risk due to a dangerously defective transmission. Re: Trans Service 8L90 8sp. This thing ran for 70k miles with the whipple only at much higher boost level and never skipped a beat. – I actually got in trouble for flushing instead of replacing before all this broke loose -I think the time is good to do the flush but they need to add for documentation and have someone else drive with you so you don’t hit the wall trying to get a snap shot the thing with getting a fix and here is a good honest take on it you need to drive the vehicle after and verify its fixed if not you need to clock in go out and get the pico and the gds data upload it to tac after putting additional 200 miles on it” make you manager drive it for a week” , they will approve replacement if necessary. 8L90 Pan Removal and Filter Replacement– Approximate Capacity 7.0 liters 7.4 quarts Overhaul– Approximate Capacity (Transmission Volume Only) 10.3 liters 10.88 quarts Complete Trans System– Approximate Capacity (Including Cooler Volume) 10.8 liters 11.41 quarts Transmission weight (approximately) 98 kg (216 lb). Refer to the bulletin for additional information, including required shudder test conditions for each vehicle being diagnosed as well as the fluid exchange procedures. A new transmission fluid exchange procedure and a new formula of Mobil 1 Synthetic LV ATF HP transmission fluid have been released to address torque converter clutch (TCC) shudder conditions on 8L45 and 8L90 8-speed automatic transmissions (RPOs M5N, M5T, M5U, M5X) in some 2015-2017 Escalade, Yukon; 2015-2018 Silverado, Sierra; 2015-2019 Corvette; 2016-2018 CT6; 2016-2019 ATS, … However, in some cases, the shudder, fish bite, chuggle, surge or vibration is caused by something other than the torque converter clutch. Thanks for your time. Our parts department contacted the local Mobil 1 rep because we are stuck with quite a lot of the black label fluid. Three clutches are applied to attain each gear except P/N. The different 8 speed transmission variants use common components. Is this true? Just a frustrating situation after all this time. Use GDS 2 or the CH-51450 PicoScope to confirm that the concern is TCC shudder and not a tire/wheel vibration or a driveline vibration, for example. All GM dealerships should receive the tool kits by the end of March 2019. I want to have the trans serviced, filter & fluid change... My local dealerships are scared of them, One shop has never done one and the other wouldn't say if they have or not. A year later, the 8L transmission series had spread out to the Corvette and trucks such as the Silverado and Yukon. This is just one example as we have several of these customers under this situation. Recently we have seen concerns raised about the 8 speed transmissions. Number of gears Transmission Type Drive Torque (Nm) ATF (full capacity) L ATF (change) L ATF type (recommended) 8: AT: RWD/AWD: 1000: 11,7: 6: Dexron HP: The RWD automatic transmissions with longitudinal positioning Hydra-Matic 8L90 (M5U) and 8L45 (M5N, M5T) … 19419039. product code 124714 I guarantee if we do it as customer enthusiasm the claim will get rejected and we don’t currently have a DMA to approve it. Required fields are marked *. In Canada, refer to the January 2019 TAC Talk seminar. packaged by 10118L18A Drum production ended in January 2019. Automatic Transmission Parts Catalog 2018+2019 Page 268", "2015 Cadillac Escalade Updated with 8L90 8-Speed Automatic and More Tech [Photo Gallery]", "Chevrolet Confirms 2015 Corvette Stingray To Utilize 8L90 Eight-Speed Gearbox", "Supercharged 2015 Chevy Corvette Z06 takes the C7 beyond the ZR1 [w/video]", "GM confirms 2015 Silverado, Sierra to get 8-speed automatic", https://en.wikipedia.org/w/index.php?title=GM_8L90_transmission&oldid=946736172, Creative Commons Attribution-ShareAlike License, Chevrolet Express/GMC Savana (2.8L diesel engine only), This page was last edited on 22 March 2020, at 02:27. The procedure in TSB #18-NA-355 provides a new fluid concentration level of 93% or higher. DT-51190-A threads into that port and connects to the J-45096 TransFlow.
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