One possibility is the combination of a broken engine/ transmission mount, and worn or loose shift linkages. Excessive movement of the engine/transaxle causes a downshift as if it came from the control. Do the engine mount test. Park in a safe spot with front/rear clearance, and raise the hood. Put the parking brake on hard, and stand on the brakes.
3/25/2018 · I believe it’s when the torque converter is locked up for fuel economy and the transmission makes the downshift to third while the torque converter is still locked, so it does not happen often. Otherwise I find the 6-speed transmission on this truck to be a very smooth shifter, actually.
8/14/2013 · Hard transmission downshift vs. driveline clunk Aug 14 2013, 1:14am So I took my 2009 Sierra (5.3, 6 speed) with 53,000 to the dealer late last week and took a ride with the service tech for a solid clunking noise when braking.
8/12/2019 · It took hours any many revisions to fix the driveline clunk issue I experienced. It is a combination of upshift and downshift scheduling problems, torque converter lock up and unlock at the wrong times, desired output torque factor issues, torque adder issues, stall torque management, tip-in torque management, limit torque management, torque …
6/15/2020 · Okay, the downshift clunking is an annoyance for me. If you are driving at 50 mph and have to abruptly come to a stop, you can hear the gear s clunking as the truck is quickly dropping gears—you mostly hear this near the end of you coming to a stop. But if you slowly come to a stop rather than abruptly stopping, then you don’t hear such clunking.
Symptoms of a Bad or Failing Downshift Solenoid …
Symptoms of a Bad or Failing Downshift Solenoid …
Hard transmission downshift vs. driveline clunk, 6/26/2018 · Reading up on it the downshift clunk is very common in other applications of the 6R80. The thing that usually fixes it is a Keep Alive Memory (KAM) clear. Afterwards the transmission relearns it’s behaviour and that usually fixes it. Problem is no common reasonably priced scan tool can do that.
10/28/2019 · Slow gradual stopping helps reduce the clunky 2nd to 1st downshift issue due to the RPM’s being lower when the Tranny finally shifts in to 1st gear. It might just be a faulty Torque converter or shift solenoid that allows the RPM to be to high during the 2nd to 1st downshift.
2/13/2017 · First time posting , F1 transmission downshift double clunk Discussion in ‘360/430’ started by steveandtracy, Feb 8, 2017. steveandtracy Rookie. Nov 13, 2016 25 LA’s Miracle Mile Full Name: Steve S #1 steveandtracy, Feb 8, 2017. Thanks to all who contribute and moderate. The time and info have really helped me build confidence in …
1/7/2016 · The transmission may stay engaged in a higher gear for an extended period of time when it should be downshifting. This will cause the engine to over rev, and may put additional unnecessary strain on the engine and transmission. 3. Check Engine Light comes on. An illuminated Check Engine Light is another symptom of a bad or failing downshift solenoid.
5/26/2020 · That’s the sound I’m describing I should say the transmission isn’t making a clunk, but the aggressive downshift causes that driveline noise. You can hear the noise in any wrangler with a manual if you don’t shift smoothly
