Rough downshift
Thread Starter
Member
Joined: Oct 2017
Posts: 198
Likes: 13
2010 C63 AMG, 2015 GL450, 2018 GLS 550, 2021 GLS 450
Rough downshift
I replaced my Transmission mounts last week, but this week I have noticed rough downshifts from 4 to 3 + rev hang, going through all Gears UP is fine.
I am 2000miles from my next Transmission Fluid change.
Any advice to remedy the problem?
I am 2000miles from my next Transmission Fluid change.
Any advice to remedy the problem?
Senior Member
Joined: Jul 2011
Posts: 256
Likes: 55
From: Ontario, Canada
2008 MB C350 4MATIC/2011 CL63 AMG/2014 C63 Coupe 507
Interesting. Does it jerk hard when downshifting?
I have a weistec built trans and after few years of it working amazing, i noticed last year from 4th to 3rd it jerks hard as if something is about to break, and makes a weird ping / pop noise while downshifting 4 to 3.
Cars in the shop getting complete upgrades plus fluid swap , and hopefully it fixes it.
I have a weistec built trans and after few years of it working amazing, i noticed last year from 4th to 3rd it jerks hard as if something is about to break, and makes a weird ping / pop noise while downshifting 4 to 3.
Cars in the shop getting complete upgrades plus fluid swap , and hopefully it fixes it.
Thread Starter
Member
Joined: Oct 2017
Posts: 198
Likes: 13
2010 C63 AMG, 2015 GL450, 2018 GLS 550, 2021 GLS 450
Interesting. Does it jerk hard when downshifting?
I have a weistec built trans and after few years of it working amazing, i noticed last year from 4th to 3rd it jerks hard as if something is about to break, and makes a weird ping / pop noise while downshifting 4 to 3.
Cars in the shop getting complete upgrades plus fluid swap , and hopefully it fixes it.
I have a weistec built trans and after few years of it working amazing, i noticed last year from 4th to 3rd it jerks hard as if something is about to break, and makes a weird ping / pop noise while downshifting 4 to 3.
Cars in the shop getting complete upgrades plus fluid swap , and hopefully it fixes it.
MBWorld Fanatic!
Joined: Nov 2014
Posts: 2,575
Likes: 407
From: Olathe, KS
'13 C63 AMG P31
Make sure the car is fully warmed up. Mine does the same thing if It isn't warm yet, it does a harsh/clunk shift from 4th to 3rd. Even if the oil temp is in the white color, it can still shift hard. If you live in warmer climate, for oil temp, 195°F+ should give you a normal shift. If it is a cold morning or day, I would wait till 210°F+.
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Joined: Sep 2014
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From: Worldwide
2007 Mercedes E63 AMG
could be low on fluid...could be your engine tune...could be a cold transmission...
if not any of those...i'd recommend bringing your vehicle to a repair shop that has STAR/DAS to run diagnostics. the system will report of any delayed shifting per gear and how many occurrences.
if not any of those...i'd recommend bringing your vehicle to a repair shop that has STAR/DAS to run diagnostics. the system will report of any delayed shifting per gear and how many occurrences.
Super Member
Joined: Feb 2010
Posts: 612
Likes: 112
2014 C63
I noticed mine did this a few times with spirited driving today. Here in FL, the oil temp was 220F when it happened so I can't say the car wasn't warm. I'll have to keep an eye on it, but sure enough it was the same from 4th to 3rd gear.
MBWorld Fanatic!
Joined: Oct 2007
Posts: 2,311
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From: Texas
10 C six trizzle
If you drive spiritedly or brake harshly it will hang gears when down shifting. Transmission and engine mounts will have nothing to do with it unless they weren't tightened. Low fluid causes weird stuff. Transmission service is a preventative maintenance item. Changing fluid, unless it's burnt from really high temps or degraded will not fix or resolve a mechanical issue. Aka my cars transmission is slipping.... I need a transmission service.... hey you just serviced my transmission and it's still slipping lol.
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Junior Member
Joined: Jan 2020
Posts: 20
Likes: 6
From: Perth, Australia
Mercedes Benz W204 C63 AMG | CLA45 AMG
Mine does the same, jerky in the 4th to 3rd downshift, it is only when braking hard to a stop as it rips down the gears in D or S, normal driving it is fine and it is fine in manual to downshift. I thought it was OK, no clunking or anything, maybe I will get it checked out.
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Thread Starter
Member
Joined: Oct 2017
Posts: 198
Likes: 13
2010 C63 AMG, 2015 GL450, 2018 GLS 550, 2021 GLS 450
If you drive spiritedly or brake harshly it will hang gears when down shifting. Transmission and engine mounts will have nothing to do with it unless they weren't tightened. Low fluid causes weird stuff. Transmission service is a preventative maintenance item. Changing fluid, unless it's burnt from really high temps or degraded will not fix or resolve a mechanical issue. Aka my cars transmission is slipping.... I need a transmission service.... hey you just serviced my transmission and it's still slipping lol.
Senior Member
Joined: Jan 2018
Posts: 415
Likes: 109
From: Whitehouse Station, NJ
2012 C63 P31 Sedan
Are you tuned? It seems that MCT cars that are tuned experience clunky downshifting on decel pretty frequently. Mine does this from time to time. I also have a suspicion that ROW boxes might be a factor as well, but I'm too lazy to swap them back and check.
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From: Worldwide
2007 Mercedes E63 AMG
ROW boxes will not affect shifting. the other thing you mentioned will.
Senior Member
Joined: Jan 2018
Posts: 415
Likes: 109
From: Whitehouse Station, NJ
2012 C63 P31 Sedan
Only reason I am suspecting the ROW boxes is that the clunky shifting feels like the car is intermittently not rev matching on downshifts. My suspicion is the different MAF metering as compared to the OEM box could be a factor considering the high LTFTs that ROW box users have reported.
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Joined: Sep 2014
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From: Worldwide
2007 Mercedes E63 AMG
you were probably low on fluid then. when the 722.9 is low on fluid it can exhibit hard shifting and shifting hanging between gears longer than it should.
Newbie
Joined: Jun 2017
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2013 C63 Sedan
I have been having this same 4th to 3rd hard downshift and it is getting worse. It is only on forced downshifts, worse in S+ and M. Car is fully warm, fluid change was about 20,000 miles ago, Eurocharged tuned and ROW’s, and has not been driven hard. It’s like what Balanbro was saying- the car does not rev match downshift it just slams into 3rd. Was thinking of switching back to factory tune to see if it helps. Have you tuned guys went back to factory tune to see if that makes a difference?
Junior Member
Joined: Jan 2020
Posts: 20
Likes: 6
From: Perth, Australia
Mercedes Benz W204 C63 AMG | CLA45 AMG
I have been having this same 4th to 3rd hard downshift and it is getting worse. It is only on forced downshifts, worse in S+ and M. Car is fully warm, fluid change was about 20,000 miles ago, Eurocharged tuned and ROW’s, and has not been driven hard. It’s like what Balanbro was saying- the car does not rev match downshift it just slams into 3rd. Was thinking of switching back to factory tune to see if it helps. Have you tuned guys went back to factory tune to see if that makes a difference?
