Had the 260E stay at the dealer for about 3 weeks. They had all the seals replaced on the trans as they were leaking, they also took the transmission out of the car to change the clutch etc, and then put it all back with new transmission oil and the whole nine yards. basically it was a maintenance task as i really didnt have any issues with the trans other than the clunks i would hear when shifting from reverse to drive at times.
Now with the car back I do feel the shifts to be a bit smoother but at the same time I have heard some strange noises and seen some behavior that does not seem normal.
For beginners, when the engine reaches 4000 or above rpm in lower gears, there seems to be a lag, kind of like a turbo lag that just kicks in, the car from there on seems to be picking up speed, but at the same time I hear the revs getting much higher than usual, and then when the gear shifts to the next gear, usually from 2nd to 3rd, there's a shudder/vibration that comes from the rear end , close to the differential.
this happens only when the shifting occurs at rpm of 4000 or higher when i'm really pressing hard on the accelerator. during normal mode of driving, everything seems to be ok.
my question is, are these symptoms of trasmision slipping ?
how can I explain the sort of turbo kick in/lag at 4000 plus rpm's ?
I'm def. going to take the car back to the dealer, but want to be educated on this so that it's easier for me to explain this to the service tech.
thnx in advance.

__________________
Whether you think you can or cannot, Either way you're right!. by Henry Ford.

From your deception it sounds like transmission chatter, slipping problem. Take it back to the dealer

got a call back from the service tech at the dealer.
he's trying to brush the issue off by saying that sometimes funny things happen after the trans fluid is flushed at 120K. how is that possible ? the trans goes from perfectly fine to acting funny just because the trans fluid was flushed ? is there any truth to this ?
the seals on the trans were leaking therefore the trans had to be taken off and mounted back.
The tech. told me that they never opened up the internals of the trans therefore didn't touch the mechanics.
Can someone give me ideas as to what could not be mounted back correctly that would cause a shudder and slippage aroun 4500 plus rpms in 2nd and 3rd ?
thnx.

__________________
Whether you think you can or cannot, Either way you're right!. by Henry Ford.

is the car automatic or manual - manual with the new clutch I presume

Is this at a dealer?

did he ask you to bring the car back in?

did he say he wanted to test drive the car?

think about this, transmission get removed from car: drive-shaft gets shifted back or removed, flex disc gets disturbed, transmission mount gets removed, connection between engine and transmission gets disturbed, input shaft to torque converter ( clutch ) gets disconnected, vacuum lines get removed, linkage gets disconnected, with a flush crude can get dislodged.

everything get reassembled, alignment of all rotating masses is important.

I would think the car gets put back on the lift and while up there the minimum thing to do is get the car running, check for vibration. Then you'd do a second trans flush to see if things clear out.

manual are robust so I would think about clutch alignment, driveshaft alignment also on a car with this mileage it ignition wires/accessories are old and get disturbed could be a culprit.

This is a tough one to answer because I suspect you have an automatic transmission but you say they took out the trans to change the clutch?

Also, you said they replaced all the seals because it would clunk when you put it in gear?

Can you clarify?

__________________
2012 E350
2006 Callaway SC560

i guess the clutch term was confusing.
it's an automatic transmission. I was under the impression that the internal clutches were changed by the dealer but I reconfirmed that the transmission was not opened up other than to change the seals. it was however removed from the car completely and mounted back.

__________________
Whether you think you can or cannot, Either way you're right!. by Henry Ford.

Yes, a fluid change can cause altered shifting characteristics, sometimes highlighting problems that were covered up by a sludgy, worn fluid.
I have seen this happen quite a few times, sometimes for the better, sometimes worse.

__________________
'96 C280 (gone)
'97 C36
'05 C230k