Derf00

My tuner doesn't have any shifting patterns available (SCT purchased through American Muscle). The tune has a firmer feel to it from stock but still less than what my modified valve body+tune has. For the vast majority of time I can leave it in D (OD off) and just drive it.

Here's the timing I'm talking about. I said it's gear overlap, that is an incorrect statement and my mistake.. It's the variable pressure solenoid and associated valve-body pistons/spring circuits that controls the speed and timing of the engagement of each gear when in D or D-Overdrive mode. When you manually shift (up or down), you are taking out some if not all of the timing circuits, thus no or reduced lag in the shifts, thus you can shock your drive train.

Normal engagement from gear-to-gear can take up to two seconds in D mode. When you manu-shift you are bypassing this process which is why it is or can feel faster. This also can shock the drive-train because instead of the delayed engagement that slips the clutches, it's just jumping into the gear with minimal delay.

https://www.valvebodypros.com/assets...ngagements.pdf
https://shop.ukrtrans.biz/wp-content...logs/5R55S.pdf
and last
https://atracom.blob.core.windows.net/gears/2012/2012-10/2012_10_04.pdf

08'MustangDude

FYI, your three links, the last two are tied to the 5r55s document.
You can't click on the 3rd link, the erratic transmission operation, it highlights both of them.

I got the InTune1000, and it has the firm shift option, and I can adjust when it
shifts. I only paid $100 for the tuner. I had a Predator, sold that for $145 when
I bought the i1000 fort $100. The predator had the options too, but not all the
intake differences.

Yeah...
When you shift manually, you're simply bypassing some of the electronic control of the transmission.
It's not timing circuits, per say, the TCM/PCM no longer has full control of the trans when you are are
out of "D". Shift timing is changed because it is doing it on demand, as you shift, not as it were in
"D" for the softer shifting. Not sure what the PWM duty cycle is for the solenoids when shifting manually...

PWM is what makes the shifts smoother, Chrysler started that with their Ultradrive transmissions.
However, theirs are loud, which is why you can hear the "Bzzzzzzzzztick" when you are next to one
as it comes to a stop into 1st gear. However, their cars what use other than Chrysler transmissions,
don't do that. The NAG1 (Mercedes based) 5-speed auto transmission used in the Charger, has a
separate (stand alone) TCM. It is not shifted in that manner. I had an '07 Charger, the NAG1 is a good
trans.

Firm shift tuning, turns off PWM, so the solenoids are applied without modulation, or a higher duty cycle,
not sure... They can tune PWM for how many pulses per second, the higher the pulses, the faster the
solenoid moves, so no PWM is a direct hit, thus fast firm shifting. As I said, not sure what manual shifting
the 5R55 does with PWM, it may disable it, or may be a higher duty cycle so the solenoids move
faster.

Thanks for the docs too, will thoroughly read through them when I have a chance..

Norm Peterson

Thanks for the links. Definitely worth a 'read' once I print them out.


Norm

Derf00

Thanks for the heads up about the links. I've fixed them.

Yeah and it's that bypassing that can break things IMO because there is no transition, it's just BAM! All, or nearly all at once, each and every time. To me the manu-downshift is the harder one on the trans though and most likely the biggest contributor to my failure. Before mine broke when I would down shift from 4 to 3 , I could sometimes feel the clutches or intermediate band would not be able to hold on during engine braking and would skip sometimes. The whole car would shudder.

Regardless, I'll have to look at another tuner or at least maybe sourcing an SCT device from another company to see what options open up. I remember we had a similar discussion about what companies lock out when you buy tuners from them. Tranny stuff is one of them. I know Level 10 transmission has a tune just for the 5r55s but I have no idea what parameters they modify or even what brand of tuner they use. I'll have to add it to my list of 'to-do's which includes that sub update for the audio system

oh and apparently there is/was a paddle shift kit available for the 5r55s. It requires a stand alone trans controller box and removal of the two Servo's on the trans.
http://www.mustangandfords.com/proje...ssion-rebuild/

http://www.performanceautomatic.com/...E_SHIFTER.html

it requires their "Street Smarts System Package" which appears to only be available on 5r55S transmissions they sell... So, not a simple add-on.

http://www.performanceautomatic.com/...log-file-1.pdf (page 10)

Funny thing is, if you just try to look for 5r55 street smarts or performance automatic, there is Zero reference to paddle shifter. ...Looks like they had offered it for a short while then dumped it and moved to the 6R80

Derf00

Absolutely! I fixed the last two links btw so they open like they are supposed to now.

08'MustangDude

I thought I had posted that link, to that Smart Shift PADDLE SHIFTER kit...

Nope. I did see it, for some reason I did not include it in those two links I put up for
the one with older transmissions. Oh, because it won't work with the 5R55, the
one I saw before states: AODE and 4R70W or GM 4L60E and 4L80E transmissions.
Also requires a performance automatic smart shift transmission control unit (TCU Sold Separately).
Ok, so back to, there isn't one for the 5R55S.

https://www.jegs.com/p/Performance-A...56813/10002/-1

SO not worth it, even IF...