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Old 03-03-2012, 07:07 PM
Btnpushr Btnpushr is offline
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Join Date: Jan 2012
Location: Texas
Posts: 14
Gender: Male
Vehicle: 2012 Ram 1500
Trim Level: SLT
Color: Red
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Originally Posted by 2011lilred View Post
Your trans is a 6 speed, but it wasn't originally intended to be one. The previous version was called a 5 speed, but had 2 different 2nd gears.

1st 3.00:1
2nd 1.67:1
2nd Prime 1.50:1
3rd 1.00:1
4th 0.75:1
5th 0.67:1

The whole 2nd Prime gear came about simply as a taller passing gear to avoid downshifting all the way down to the 1.67 gear when you stomp on it on the highway. As you would likely be in an overdriven gear at the time, jumping all the way down into the traditional 2nd gear causes rpms to skyrocket.
Hey, I appreciate your informative input. I just bought a new 2012 Ram SLT Shortbed with the HEMI and put dual Flowmaster 50s on it. Interesting bout the transmission. Enjoying the truck tho wasnot impressed with the dealership. thnx
2nd Prime was not originally intended as an upshift gear, but people figured out how to access it (mostly for drag racing) so it just morphed into one. For 2012 the engineers put it in the upshift sequence, so yes it is a 6 speed (some call it a marketing ploy) but the gear spacing is goofy. I don't know for sure, but would expect the 2010 ECU would work, it would just switch your shift sequence to eliminate using 2nd Prime during a natural upshift.

If tuners aren't out by the time the warranty expires I might consider it, but until then, the factory installed ECU stays.
Hi, just bought a new 2012 Ram SLT Regular Cabl shortbed and put dual Flowmasters on it. Appreciate your informative input.
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