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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #131  
Old 01-29-2012, 04:23 PM
BgHrn BgHrn is offline
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Ah, alright then. Thanks!
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  #132  
Old 01-30-2012, 10:26 PM
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I've had mine for a while...no issues
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  #133  
Old 01-31-2012, 04:23 PM
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Will this work on the 2012 six speed? I contacted the company that you bought yours from and they said they would contact sonnax and get back with me and they haven't.
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  #134  
Old 01-31-2012, 04:57 PM
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Its for the 545rfe trans witch is an auto.
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  #135  
Old 01-31-2012, 05:22 PM
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I have a 2012 with the so called 6 speed and it worked .Plug right in .....
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  #136  
Old 01-31-2012, 06:13 PM
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I was able to obtain one from sonnax at sema and for the first couple weeks I could "feel" the difference on my daily drive to work. After a few months now it feels the same as it did before I put one in. I use to be able to feel the firm shift and now its just a smooth shift like before. At this point I may remove mine just because its not really gaining anything but its not hurting anything either so I might as well do without as i'm not out any money on it. Just sharing my experience.
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  #137  
Old 01-31-2012, 11:26 PM
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^^^thats what TransEngineer is getting at too...mine feels pretty normal now too! I want to take mine out and see if it starts to slip
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  #138  
Old 02-01-2012, 12:53 AM
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So....I've been doing some experimenting, and found some interesting (although not conclusive) results. All the tests were run with NO trailer and minimal payload.

I removed my tune and the Sonnax...at the same time. Truck ran like garbage and shifted ultra sloppy for about 1 minute, then started to sort itself out. The shifts were ultra smooth, and the shift time was IMO quite long. I kept it like this for a couple of days, >100miles and 15+ start cycles. On the 3rd day, I reverted to manual shifting and aggressive driving. Within a few minutes (3-4 starts from a dead stop), the trans started to shift a bit more aggressively and faster, and the engine seemed happier. I kept this up for a couple of days with a good mix of city/highway and many start cycles.

I then installed the Sonnax and immediately noticed a difference. Shifts were fast and firm.....for awhile. After 5 starts cycles and 30+ starts from a red light, I noticed the shifts were decreasing in firmness. By the end of the first day, it felt like I have never installed the Sonnax unit at all!! Didn't matter whether I ran easy or aggressive, the results were about the same as without it.

I then removed the Sonnax unit, and trans shifted terribly (even noticed a bit of slippage) for about 2 starts from a dead stop. Then it was back to 'normal'.

Next day I installed my 91 tune, which was really noticeable! The trans seemed to shift firmer, so I drove like granny for 2 days, and although it softened slightly, it never got as soft as without the tune. I then switched to 'lets have fun mode' and after a few minutes manual shifting, etc. it firmed up, and sped up slightly...but noticeable.

I then installed the Sonnax, and the first shift out of the lot broke the tires loose. Now that's not very impressive when you consider how slippery the roads are, but was certainly much firmer than it was 5 minutes before that.

I have left it in that configuration since, and the soft shifts after 'granny driving' for a couple of days (That was really hard to do when all you want to do is drive 'normal'), were firmer then the firmest shift attained in 100% stock mode. When I then opted to drive 'my normal', the firmness of the shifts returned within minutes.

In conclusion - I have absolutely no idea what is all happening, but believe the tuner is affecting the transmission, and under the conditions I present to my truck with my driving style, the Sonnax unit is making a difference that pleases me. But it only appears to do so when I have a non-OEM tune in the PCM.

With the tune out of the system, I experienced results that fully support what TransEngineer mentioned about how the trans will adapt.

I'm looking forward to further experiments this summer that will hopefully include a comparison between SuperChips and Diablo. It is my understanding that SC allows for some trans modding that is currently not available to me with my current tuner. I also hope to install a mechanical trans pressure gauge to see what is actually happening.
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  #139  
Old 02-01-2012, 01:30 AM
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SO in short stay away from the sonnax with a tune thats what killed my tranny about a year ago...
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  #140  
Old 02-01-2012, 11:58 AM
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great info Brad, ive read so much with this post and the info is amazing, but i def will stay away from this
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