7137 Partial throttle trans shifting blows.

[electricmarquis]

I think I speak for alot of us or at least the 2007 Rams(others chime in). When you first use Diablo the calibration update that gets us all on the same page screws us up. The partial throttle trans drivability is not all there.

The main problem is the 5th OD gear holding way to long and most of the time with a low speed of 40mph. You can press the gas at least up to 40% or so and no downshift even at 40mph. Such a high engine load makes knock retard while crusing. The original factory software on the PCM was way better than the updated trans stuff.

Maybe a howto on the CMR forum or a screen grab on what to change to make the 5th gear drop to 4th on lighter TPS command would be nice. Maybe the same for all gears. I have talked to a few CMR guys and the 5th gear is not defined in the file.

Those with a CMR tune that use boost via a turbo or super need this answer to make our trucks drive better. See the 5th gear holding to long and pressing the gas and pressing it more and more waiting for a 4th downshift see the surge valves closing and a surge from the motor trying to make boost at a low RPM and high engine load. Really horrible feeling. The higher the load on the engine and the higher the gear the easier it is for manifold vac to drop to 0 causing this issue.

[Speed1B]

I agree. It takes way too long after i put the pedal to the floor for it to kick down.

[hemifever]

I don't see anythingin the CMR software that relates to 5th gear. 4th and 4p, but not 5th.

[DiabloFan]

Having to floor it to get a downshift definately blows.

[johan]

Someone shoot me a file and i will see what i can come up with for you.

[~RAM~]

U want me to send u my file?

[electricmarquis]

Here is one of my CMR files. Try to make the 5th OD gear require less pedal to downshift to 4th. I will have my CMR guy put the changes on the current CMR file Im running. It is locked so I think only he can do it.

The 1,2,3 gears are ok. I dont know about 4th yet because 4th only engauges for like .5 second before 5th takes over and doesnt let go.

[johan]

Give this a shot, trans changes only.

[electricmarquis]

So is 4p really 5th Johan?

[johan]

I would think as there are no other indications of 5th in the code.

[electricmarquis]

OK. I sent it to my CMR guy to place them into my most current CMR file. I will report back what the findings are. The only other thing I can think of is getting someone to read the last PCM software from my PCM per serial/version sticker that was on there. There is only one person I know that can do that because he has a catalog of the revisions. He is also very hard to get a hold of and is kinda short in letting people know his knowledge. Used to be a Chrysler engineer, now he is on his own and charges big bucks for computer changes.

[~RAM~]

How do I load this tcm calid?
Do I have to have a custom tune?

[electricmarquis]

You should not. Its a full CMR file from a custom boosted tune. I also have a 2007 combo PCM/TCM. You cant anyway, its my VIN.

[mikel]

How do I load this tcm calid?
Do I have to have a custom tune?

He would need your file to get a tune for your truck...

[johan]

DSDL will ask for a tcm file when you load the pcm file into your truck, then just pick the tcm file and then the tcm base file and you should be good to go.