C43 2017 Agressive Thud on Downshift

trickyrich

New Member
Joined
Oct 14, 2021
Messages
4
Reaction score
1
Your Mercedes
C43
Hi Everyone,
I'm beginning to experience an aggressive Thud from what sounds like either the gearbox, prop or diffs when slowing down and downshift gears are selecting. Doesn't happen all the time but more prominent when just starting out cold or when car has been left for a period of time. No warning lights etc.

Anyone have any ideas on what this might be?

Thanks in advance of your support.
 

Shsuny0305

New Member
Joined
May 23, 2021
Messages
2
Reaction score
0
Your Mercedes
E350e
Hi, you don’t say what transmission you have. I experienced this same problem with my E350e which has the 9g transmission. I was advised by an indy (George Fraser) that they recommend transmission oil and filter change at 40 k miles.
Oil filter changed, and normal (silky) service resumed.
 
OP
T

trickyrich

New Member
Joined
Oct 14, 2021
Messages
4
Reaction score
1
Your Mercedes
C43
  • Thread Starter
  • Thread starter
  • #6
All oil levels have been renewed with new filters and gearbox sump assembly. Still experiencing thud on downshift from 3 - 2.

Any thoughts?
 

Srdl

Senior Member
Joined
Oct 8, 2015
Messages
7,102
Reaction score
5,904
Location
Hampshire
Your Mercedes
GLC43 AMG 2018 (X253)
Not having any problems (yet!) with my 43 but only on about 29k miles so far. Have you asked Mercedes whether there are any transmission software updates which might help?
 

leespo

Senior Member
Joined
Dec 27, 2021
Messages
75
Reaction score
58
Your Mercedes
C43 Estate
I wouldn't say mine is aggressive or a massive thud, but I do feel on occasion that the 3rd to 2nd change is not the smoothest, not all the time depends on mode and revs etc but maybe a trait of the car a little depending on how bad it is

Sent from my SM-G991B using Tapatalk
 

AIB understand your special Mercedes deserves a special insurance policy. We have a refreshing attitude to insuring high performance, modified, imported or classic and vintage cars and deal with the UK’s leading insurers. We offer discounts for length of ownership, where the vehicle is kept overnight and limiting the mileage and can also cater for those clients who need higher mileage and business use. To obtain a quotation please call the team on 02380 268351 or visit us atAIB Insurance
Top Bottom