Might finally be time to worry about the transmission

[jimmyducati]

My '10 SHO with the LMS 4+ tune did something like that a couple months ago, normal take off from a red light and right after shifting into second it dropped into neutral and fell on its face. let off the gas and eased back into it and all was well. The guy behind me thought I brake checked him, judging the "eat s***" look on his face when he passed me.

Also from time to time, the 3-2 downshift has a alarmingly loud clunk or thud as it downshifts, that worries me more than the random one time miss into second.

[crash712us]

My '10 SHO with the LMS 4+ tune did something like that a couple months ago, normal take off from a red light and right after shifting into second it dropped into neutral and fell on its face. let off the gas and eased back into it and all was well. The guy behind me thought I brake checked him, judging the "eat s***" look on his face when he passed me.
There is TSB's that remedy these issues.
Also from time to time, the 3-2 downshift has a alarmingly loud clunk or thud as it downshifts, that worries me more than the random one time miss into second.

[mval]

jimmy- my '10 does it every once in a while turning into driveway & going up my hill into the garage when downshifts from 2 to 1. Has done it about a dozen times over 4 yrs. No loud sound just like falls out of gear. I also heard about tranny issues with our 6speed over & over again . wish would either quit or happen more. guaranteed going to have them look at it before my extended warranty is up.

[rowland2004]

My '10 SHO with the LMS 4+ tune did something like that a couple months ago, normal take off from a red light and right after shifting into second it dropped into neutral and fell on its face. let off the gas and eased back into it and all was well. The guy behind me thought I brake checked him, judging the "eat s***" look on his face when he passed me.

Also from time to time, the 3-2 downshift has a alarmingly loud clunk or thud as it downshifts, that worries me more than the random one time miss into second.

Know this is an older post but i also got this 1-2nd shift free revving and needing to let off the gas to let the transmission re-engage. I have the LMS 4 tune. I then checked the trans level since the car only has 6k on it and found that it was almost 1qt low. After doing a trans drain and refill haven't had that happen again. But i do still get 1-2 studders between the 1-2 shifts. 

[SHOdded]

Car must have been low on fluid right from the factory, that would be pretty sad!  Have you had LME lower the shift pressures a tad for the 1-2 shift?

[irondoor19]

Ok:

So this has happened to me (once or twice)
and it seems to happen On a Bumpy Road Uneven roadsurface.
From a Dead Stop, AND doing a Drag Style launch,
Car does not come out of first, just skips off the rev limiter,
and it is a little unnerving (to say the least)
no problems at the Drag strip or smooth surface

[SHOdded]

There are many trans/PTU related TSBs for the Gen 4.1 SHO, you should take a look:
http://www.ecoboostperformanceforum.com/index.php/topic,496.0.html

There's even one for a 5th gear start, for example.  That is fixed by replacing the transmission range sensor.
6F50/6F55 TRANSMISSION - SLIP/NEUTRAL OUT - 5TH GEAR START FROM STOP - BACKUP CAMERA ON IN DRIVE - BUILT 3/13/2009-6/30/2010 
TSBID: 180543 Mfg Num: 13-5-27 Issue Date: 2013-05-27

Then there's one for a slip on acceleration, caused by a broken orifice restrictor cup plug.
6F50/6F55 TRANSMISSION - DTC P0751 - HARSH OR NO FORWARD ENGAGEMENTS - PERCEIVED SLIP ON ACCELERATION - SLIP/DELAYED AND/OR HARSH DOWNSHIFTS 
TSBID: 171494 Mfg Num: 10-9-9 Issue Date: 2010-05-11

[rowland2004]

Car must have been low on fluid right from the factory, that would be pretty sad!  Have you had LME lower the shift pressures a tad for the 1-2 shift?

Yes i did get the soft shift V10 but the 1-2 shift was actually worse with the stutter. Now i only get 1 or 2 stutters before shifting to 2nd when WOT. I have flushed the trans twice to make sure fluid is correct. 6k miles on the car.

[SHOdded]

Have you had the appointment at the dealer yet, rowland, for the smoke out the exhaust issue?  Any signs of fluid leaks from the transmission or PTU?

[rowland2004]

Yes i did. Ended up being overfilled from the dealer with oil. Also thinking when i had the passenger side on the ramp and the car leaning over to help burp the system after TS install.

[rowland2004]

Also is it normal on the first few flushes to get a couple specs of brass is what it looked like. Still get the 1-2 stutters for the 1st to 2nd shift WOT


Sent from my iPhone using Tapatalk

[SHOdded]

There's always some breakin material/debris in the early miles, be it engine or transmission.  But it should be very fine material, not stuff that would easily show up on blotting paper unless there was a significant quantity of it.  And most of it should be caught by the drain plug.

Do the stutters happen when the stock tune is loaded?  How many miles have you put on the V10 tune, i.e., are you comfortable that the relearn has completed?

[rowland2004]

Not at all with the stock tune. Have about 300 miles on the v10 and have flushed the trans twice with new fluid. Also tried the soft shift v10 tune and it was worse for 1-2nd on the stutter 3-4 stutters. Now only 1-2 on the v10 normal tune.


Sent from my iPhone using Tapatalk

[SHOdded]

Might want to try the V8 tune, that has been around for some time. 

Gonna ask some stupid questions here:
1. You are running 93 gas, right?  E0, E10?  Winter or summer fuel?
2. When you say flush, did you actually flush the trans, or do a drain & fill?  Motorcraft Mercon LV or some other fluid?
3. When not going WOT, there's no stutter?  Engine/trans warmed up before going WOT?  What are the surface/ambient temps in your area?

[rowland2004]

Might want to try the V8 tune, that has been around for some time. 

I haven't loaded it yet as i was waiting a week for this tune to hopefully change.

Gonna ask some stupid questions here:
1. You are running 93 gas, right?  E0, E10?  Winter or summer fuel? 93 gas have been through a few tanks and different stations
2. When you say flush, did you actually flush the trans, or do a drain & fill?  Motorcraft Mercon LV or some other fluid?I did the drain fill twice with LV Valvoline
3. When not going WOT, there's no stutter? No  Engine/trans warmed up before going WOT?Yes 30min of driving min  What are the surface/ambient temps in your area?Around 55F-70F Surface is smooth road and straight line.