Mexico and Export Regions should follow Bulletin 19-NA-018. I suppose you would be fine without it, currently all my shudder issues are eliminated on all vehicles equipped with the 8 speed transmission. Bulletin No.: 18-NA-355 Date: March, 2019 TECHNICAL Subject: Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed Attention: This Bulletin only applies to vehicles sold in the U.S., Canada and Middle East Operations (MEO). I use one bottle of Lubeguard Platinum each time I do this, their formula is designed specifically to combat this issue and in my opinion helps the trans run smoother. IMHO, a dealer flush is a greater risk to long term transmission life than regular fluid changes. I have had 3 GM vehicles with 8 speed transmission and this has been the ONLY "fix" that completely eliminates the issue. The entire process takes not much longer than an oil change and performed every 10-12K miles will prevent all shudder issues. The easiest way to avoid it is to use a fluid extractor and suck all the fluid out you can get from the fill hole on the side(usually around 6 quarts) and then refill with BLUE LABEL Mobil 1 ATF, warm the trans to temp and perform the fluid check. You will not obtain any greater fluid life or a permanent fix by doing a dealer "flush", "triple flush", etc. 18-NA-177 - RevBase - Chevrolet Bulletin RE: Procedure to confirm that shudder in Chevy Colorados and GMC Canyons is transmission related and if confirmed, directive to effect. Does not appear to be a clear Chevrolet policy regarding the issue.Īt the end of the day the fluid in these 8 speed transmission only lasts about 15-20K before it starts shuddering. Not sure how the TSB is "coded" for bumper to bumper or powertrain.on page 17 on the TSB 18-NA-355 it states "For vehicles repaired under the powertrain coverage." Would like to hear from someone familiar with how the Chevrolet warranty program distinguished from bumper to bumper to drivetrain. Mine got so bad the control arms need replaced. ![]() My truck is in the shop for ref service bulletin 18-na-355. My VIN does not fall under that service bulletin. Chevrolet Customer Care agreed to reimburse me approx $100 of the $453.60 invoice. There is an active service bulletin for 2017 chevy Colorados. Dealer said the transmission flush to fix shudder is covered under the bumper to bumper and not powertrain warranty. Bad logic on my part, I guess.I am in the same boat as you sorry to say. The future may bring newer technology that could. I asked about $400 now or $4000 later and received no joy. If looking at used 17+ V6/8spd trucks, ask if TSB 18-NA-355 with 2/19 revision or later has been done. Am I missing something or expecting a freebie without reason. I still have 8 months and 30,000 miles of drivetrain warranty left. The service writer said it would have been covered under the 3/36000 bumper to bumper but according to GM not covered under the drivetrain warranty. I searched everywhere for the reference for this service to be done at no charge but no luck. According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses torque converter clutch (TCC) shudder conditions on 8L45 and 8L90 eight-speed automatic transmissions, RPO.
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