Transmission Thud Question
Thread Starter
Super Member
Joined: May 2004
Posts: 791
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From: Monroe, Louisiana
SL 65 AMG and E63s AMG
Transmission Thud Question
I've noticed a few times in the last mos that when I accelerate vigorously and get to high RPM in first or second gear then abruptly shut it down that something makes the car feel like it's being hit in the rear.
This also happens sometimes when getting back on to the gas after braking hard.
It's seem to me that I remember something about the type a Trans that MB uses, lockup type? Is this normal? Please clue me in. Thanx
This also happens sometimes when getting back on to the gas after braking hard.
It's seem to me that I remember something about the type a Trans that MB uses, lockup type? Is this normal? Please clue me in. Thanx
Thread Starter
Super Member
Joined: May 2004
Posts: 791
Likes: 0
From: Monroe, Louisiana
SL 65 AMG and E63s AMG
Member
Joined: Sep 2005
Posts: 224
Likes: 0
From: Cary, IL
2003 CL55 Kompressor Horizon Blue Metallic
I've noticed a few times in the last mos that when I accelerate vigorously and get to high RPM in first or second gear then abruptly shut it down that something makes the car feel like it's being hit in the rear.
This also happens sometimes when getting back on to the gas after braking hard.
It's seem to me that I remember something about the type a Trans that MB uses, lockup type? Is this normal? Please clue me in. Thanx
This also happens sometimes when getting back on to the gas after braking hard.
It's seem to me that I remember something about the type a Trans that MB uses, lockup type? Is this normal? Please clue me in. Thanx
If you can duplicate the situation consistently, see if the technician can disable the torque convertor lockup why you drive the car to see if there is an improvement.
If you are higher miles like me, the first simple step is to change the tranny filter and fluid. I'm going to go out on a limb and let everyone know that that "lifetime fluid" stuff is bunk, change the fluid and filter at least at the 50K mile mark.
Last edited by mclarenm8d; Nov 17, 2006 at 02:21 PM.
MBWorld Fanatic!
Joined: Aug 2005
Posts: 4,574
Likes: 3
From: Sugar Land, TX
BMW E39
I've noticed a few times in the last mos that when I accelerate vigorously and get to high RPM in first or second gear then abruptly shut it down that something makes the car feel like it's being hit in the rear.
This also happens sometimes when getting back on to the gas after braking hard.
It's seem to me that I remember something about the type a Trans that MB uses, lockup type? Is this normal? Please clue me in. Thanx
This also happens sometimes when getting back on to the gas after braking hard.
It's seem to me that I remember something about the type a Trans that MB uses, lockup type? Is this normal? Please clue me in. Thanx
I get that too. I also get that when I'm driving very slowly in bumper to bumper traffic. And it only happens shifting from 1st to 2nd.
Thread Starter
Super Member
Joined: May 2004
Posts: 791
Likes: 0
From: Monroe, Louisiana
SL 65 AMG and E63s AMG
I have a follow up. The thud still is not fixed but has changed completely. The dealer upgraded the software for the transmission software and it now thuds much less but does it with lighter acceleration/deceleration than before.
One added bonus is that it changes gears much quicker and with more aggressive shifts. It acts like my old Ford C4 with a "shift kit". I've noticed that it grabs (yellow triangle flash) when shifting into 3rd and 4th on cold pavement.
I think that this is an area that aftermarket guys need to explore, I like the feel much better even though the slack in the tranny/differential still seems to be there.
One added bonus is that it changes gears much quicker and with more aggressive shifts. It acts like my old Ford C4 with a "shift kit". I've noticed that it grabs (yellow triangle flash) when shifting into 3rd and 4th on cold pavement.
I think that this is an area that aftermarket guys need to explore, I like the feel much better even though the slack in the tranny/differential still seems to be there.
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MBWorld Fanatic!
Joined: Mar 2005
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From: El Ay, Cali-fo-ni-A
is Sick as Fu*k
happens to me too...I think it happens when your in (S)mode...try doing that in (C)mode...the tranny is being jumpy in (S) so i think thats why it jumps like that when you stop punching it
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