New Mopar Performance SRT-8 TCM

[gfr-300SRT8]

"Most customers should be able to install the part themselves, just be sure to follow all the instructions included with the kit."

I wonder if the SRT MTCM instructions state that we have to watch the tranny temp during calibration.

If they do, will a Predator, hooked up to read live, give me the tranny temp?

nope

[Hemissary]

It can't be understated the importance of following the instructions included with the device...transmission temperature in integral to the process...

[moparmike610]

This part is currently available at the dealerships. Spoke with engineers, no change in calibration other than it being setup up to better support the NGC4 controller (07+). As far as shifting capabilities, it is exact specs as the Mopar (performance) TCM some of us already have.

-Jim
Hemi Shop Director
516.204.5133

So does this mean it works on the 07-08 5.7s? My 08has the ngc4 from what I've found etc...

[rick s]

It can't be understated the importance of following the instructions included with the device...transmission temperature in integral to the process...

Does anyone know why the trans temp is so important? I can understand "warmed up," but why such a tight range?

However, why at all? When the cars were brand new no one drove the car and put it through this process on the original TCM. What's so different from the stock TCM to these?

[Hemissary]

Read the Transmission section, specifically operational parameters at different temperatures. It is noteworthy that functionality is significantly altered based directly on actual fluid temperature.

http://www.bellybuttonporn.com/manuals/

The adaptation procedure ensures the physical parameters being monitored are actually within a baseline tolerance (or range) for specific temperature windows. The idea being that for an expected operating parameter, indeed the monitoring system in of itself is accurate.

Significant problems can occur if the monitoring system was not calibrated correctly, and senses what it believes is normal operation when in fact the transmission is operating outside of the expected range...and causing damage.

Users who have elected to ignore the adaptation procedure, in simple terms have allowed the TCM to store worthless operational setpoints and/or values. Same goes for measuring actual fluid level and correlating to temperature...the measuring procedure was designed for a reason...namely transmission functionality/longevity. Some speculate it's to force onwers to dealerships...hogwash.

[rick s]

So what's the least expensive device I could buy to watch the temp?

[Hemissary]

I'm not sure; I use 2 Aeroforce A-pillar gauges that allow me to monitor a myriad of critical values along with Transmission parameters. Maybe someone else can point to other less expensive devices that can monitor PID's in real-time.

What I can say is that the Aeroforce system (to me) is indespensible now, especially with it also displaying wideband O2...

[budoboy]

You can get used dashhawks cheap. Bought mine on craigslist just to monitor tranny temps with a new torque converter.

[Animal451]

I've read in here that the MTCM will not auto-upshift when in autostick mode but mine does. It shifts alot firmer and I love it but wanted to verify the auto upshift?

I followed the instructions and installed my stock tune before making the swap, swapped TCM's, downloaded stock tune to my trinirty, then uploaded the CMR tune. I went out and calibrated the TCm and it runs great!

[Hemissary]

Go into transmission parameters and select under paddle hold option #1, save, then try again. If this does not produce the desired results, go back and select the next option...

[Animal451]

Thanks . . .

[Animal451]

OK, I haven't changed any of the settings yet since installing the MTCM and last night I decided to raise the shift points and now it doesn't auto upshift. That seemed a little strange . . .

I also noticed the shifts didn't feel as firm as before and I thought I ruined my TCM but it's starting to feel better the more I drive it. My question is should I go through the recalibration procedure after making changes?

[Hemissary]

Throttle Response

Raising the shiftpoints with a MPTCM is ineffective...

[Animal451]

The MTCM was shifting at (approximately) 6200 before I raised the shift points but I didn't want to make any changes yet. Like I already said at now also does not auto upshift and it did before I raised the shift points. I tried this several times shifting 1st to 2nd and 2nd to 3rd. I found it strange that it did upshift when everybody said it didn't. I was confused and wanted to ask the question to see if I did something wrong. The more I drive the car after raising the shift points the shifts seem to get more firm and now it doesn't shift until above 6600 (approximatelt). I'll have to datalog to get more accurate numbers.

[SPRBEE]

Hoping to install mine in just over a month. Will let you know how it goes.