Tranny Slam RO Attached
Thread Starter
Junior Member
Joined: Jul 2012
Posts: 31
Likes: 0
From: Atlanta GA
2011 C300 Lux CPO Pur 07/12/12
Tranny Slam RO Attached
Guys, 2011 C300 was shifting hard on the 4/3 downshift (slam) and shifting hard on the 4/5 upshift at highway speed. This was a regular event and was easily reproduced for the shop foreman during a ride-along.
I was shocked when the SA called and said they fixed it with software only. I thought for sure there would be some damage.
55k miles now and no real issues other than this--did experience the hard shift and slip on the 1/2 upshift a year or so ago, but that was fixed with an adaptation/software upgrade as well.
Since the pan was not dropped, I'm concerned that there could be evidence of wear (metal flakes) that may cause damage later.
Do you think this is just a push back to avoid the expense of a replacement (mother ship cost control)? I have about 10 months of CPO left, thankfully. I did have the tranny service at 40k with TC drain at the dealer--had to go through hoops, but they did it.
I must admit that for now, the tranny shifts like butter and no issues at this moment.
I was shocked when the SA called and said they fixed it with software only. I thought for sure there would be some damage.
55k miles now and no real issues other than this--did experience the hard shift and slip on the 1/2 upshift a year or so ago, but that was fixed with an adaptation/software upgrade as well.
Since the pan was not dropped, I'm concerned that there could be evidence of wear (metal flakes) that may cause damage later.
Do you think this is just a push back to avoid the expense of a replacement (mother ship cost control)? I have about 10 months of CPO left, thankfully. I did have the tranny service at 40k with TC drain at the dealer--had to go through hoops, but they did it.
I must admit that for now, the tranny shifts like butter and no issues at this moment.
Last edited by CD30043; Feb 13, 2015 at 05:06 PM.
Thread Starter
Junior Member
Joined: Jul 2012
Posts: 31
Likes: 0
From: Atlanta GA
2011 C300 Lux CPO Pur 07/12/12
The dealer, as many do, insisted that there was no way to drain the torque converter. They finally agreed to look for the drain plug and did the job properly.
Senior Member
Joined: Jun 2013
Posts: 288
Likes: 2
From: New Jersey
2012 C300 sport
When I questioned the service writer at the dealership where I purchased my car, he told me they do the change by vacuuming it out through the dipstick tube, they don't drop the pan at all. I then asked if this method empties the torque convertor and he said yes! About $600. I left.
Senior Member
Joined: Jan 2015
Posts: 282
Likes: 3
From: Bellingham WA
Audi R8
I used to work with Volvo in which we had to deal with the **** GM 4T65 trans used in the T6 model P2's. The TCM software upgrades in many cases did correct the shifting issues, however, I would say the majority of that was the fact that it reset the learning process for the gearbox.
Which if I am not mistaken we have the ability to do that ourselves. As far as damage, that would be hard to prove unless there were fault codes, and/or by some chance excessive material was found in your oil, which unfortunately is probably unlikely.
Just my thoughts.
Which if I am not mistaken we have the ability to do that ourselves. As far as damage, that would be hard to prove unless there were fault codes, and/or by some chance excessive material was found in your oil, which unfortunately is probably unlikely.
Just my thoughts.
Member
Joined: Nov 2014
Posts: 138
Likes: 2
From: Central Pennsylvania
2013 C300 4matic Sport
When I questioned the service writer at the dealership where I purchased my car, he told me they do the change by vacuuming it out through the dipstick tube, they don't drop the pan at all. I then asked if this method empties the torque convertor and he said yes! About $600. I left.
Senior Member
Joined: Jun 2013
Posts: 288
Likes: 2
From: New Jersey
2012 C300 sport
xjmoe83 I am either mis-informed or confused, or both. I'm sure I asked the dealer specifically about the torque convertor, but there must be a misunderstanding somewhere. To further my confusion I have seen quick lube places advertise trans service with the vac method. Anyway, is the $300 price you mentioned from a dealer or indy shop? Thanks.
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