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Old 08-04-2011, 09:50 AM
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Why little to no confirmed info on 2012 6sp auto?

I heard its just a reprogramming of the current 5sp auto & new torque converter but would really like confirmation of the ratios/final drive before deciding on a 2011 or 2012 Hemi. I know the fuel economy rating went up but not sure if its due to the tranny or not. Anyone else have more info, Milous?
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Old 08-04-2011, 12:30 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

No info on it because it doesn't exist.
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Old 08-04-2011, 12:42 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

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Originally Posted by kokanee13 View Post
No info on it because it doesn't exist.

All 2012 Grand Cherokee Hemi's have a 6 speed transmission.
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Old 08-04-2011, 04:34 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

Actually all 2011s have a 6 speed already - it's just in how the gears are labeled and the shift points are programmed...
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Old 08-04-2011, 05:01 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

oh no....here we go again...
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Old 08-04-2011, 05:20 PM
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And so far no one with a 2012 have chimed in on how the modified transmission drives.

Sent from my Transformer TF101 using Tapatalk
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Old 08-04-2011, 05:47 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

Actually I dont even know if we know what the MPG is on it. That EPA website has the 2012 model labeled as having a 5 speed so I don't know if I would even trust that. It will be nice to see a 2012 4x4 v8 window sticker. I would also love to see the gear ratios to see if they gave first gear a higher ratio and make it faster off the line.
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Old 08-04-2011, 06:24 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

The 2012 Hemi on the Grand Cherokee is definitely 6 speed transmission and this is confirmed by window stickers out already, as is the mpg.


CITY MPG
Fue
13
Highway MPG
20

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Old 08-04-2011, 08:06 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

Thanks for the link to the window sticker!
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Old 08-04-2011, 08:15 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

The 6 speed is called the 65RFE,its basically a 545RFE with different software.
Here's the gear ratios
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
Reverse-3.00:1
Where's 6th gear? Looks a lot like a 545RFE ratios to me.Looks like they are calling 2 prime another gear? If thats the case,WJs had a "6 speed". It's the exact same trans that was a 4 speed in 1999-2000,became a 5 speed with different software in 2001,and now its called a 6 speed
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Old 08-04-2011, 09:13 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

Quote:
Originally Posted by xj31 View Post
The 6 speed is called the 65RFE,its basically a 545RFE with different software.
Here's the gear ratios
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
Reverse-3.00:1
Where's 6th gear? Looks a lot like a 545RFE ratios to me.Looks like they are calling 2 prime another gear? If thats the case,WJs had a "6 speed". It's the exact same trans that was a 4 speed in 1999-2000,became a 5 speed with different software in 2001,and now its called a 6 speed
If this is true it really makes me wonder if the recent TSB for 5.7's with the 545RFE was really just to put the newly refined "six speed" programming that is in the 2012's into the 2011's. Mine just shifts so much better now, it feels like a different trans. I had heard that at least one of the ratios was new in the 2012's though. Everything I have read about the new six speed is somewhat incomplete and speculative, although they are now calling it a six speed for sure.
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Old 08-04-2011, 11:39 PM
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Re: Why little to no confirmed info on 2012 6sp auto?

Sorry I though you were talking about the SRT8
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