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Old 02-11-2013, 02:40 PM
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2012 5 or 6 speed? Confused? (Hemi)

Hey, so aving the act that two months ago i wrecked by wk overland im in the markt et for a 2012 used overland summit. My question is, why do i keep reading some listed as 5 speeds on cars.com ? Is it just a question of them mislabeling them? I was under the impression all v8 for 2012 were 6 speeds, no?
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Old 02-11-2013, 03:03 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

Doesn't matter as all V8s use the same transmission whether you call it a 6 speed or 5 speed. Those are marketing terms for the same transmission.

The only functional difference is that at highway speeds when you tap the shifter left the vehicle will do one of two things:

1) for 2011, display 5, disable MDS, and downshift to first overdrive (sometimes called 5th).
2) for 2012+, display 6 and disable MDS. If you want to downshift to first OD you tap again.

There is a bit of confusion in the community and listings could be mis typed or cut/pasted, but it doesn't matter.... although you may be able to get a discount for a 5 speed
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Old 02-11-2013, 03:31 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

Here's some Reading Material from the WK2Jeeps website. It should answer all of your questions.
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Old 02-11-2013, 03:32 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

All 2012 Grand Cherokee V8s are 6 speeds. It's mislabeled if it says it's a 5 speed.
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Old 02-11-2013, 03:39 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

Quote:
Originally Posted by SMG1 View Post
Here's some Reading Material from the WK2Jeeps website. It should answer all of your questions.
Lol thanks, i really only had one question as to why some for sale 2012s are being labelled as the 5 speed. I know the differences
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Old 02-11-2013, 03:40 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

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Originally Posted by jgc4ever View Post
All 2012 Grand Cherokee V8s are 6 speeds. It's mislabeled if it says it's a 5 speed.
Thanks!
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Old 02-11-2013, 04:39 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

Quote:
Originally Posted by jgc4ever View Post
All 2012 Grand Cherokee V8s are 6 speeds. It's mislabeled if it says it's a 5 speed.
I believe you are correct that it is a 6 speed, but only 5 gears are available most of the time as one of the gears is a prime gear. I believe the transmission skips 3rd gear and goes directly from 2nd to 4th unless downshifting.

The 45RFE, 545RFE, and 65RFE automatic transmission for Jeeps and Rams
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Old 02-11-2013, 05:18 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

Quote:
Originally Posted by ooja3k View Post
I believe you are correct that it is a 6 speed, but only 5 gears are available most of the time as one of the gears is a prime gear. I believe the transmission skips 3rd gear and goes directly from 2nd to 4th unless downshifting.

The 45RFE, 545RFE, and 65RFE automatic transmission for Jeeps and Rams
I have the 6 speed and I'm pretty sure no gears are skipped. I can check by pushing left on the autostic and it will go into the gear it's in and I've done this and seen every gear I think.
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Old 02-11-2013, 05:41 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

My understanding was taht two of the gears, 2nd and 3rd (have also seen as 2'), were so close together that one is used going up and the other when downshifting. The first four are 3.00, 1.67, 1.50, and 1.0.

Planetary gearsets are like that, could have multiple reverse gears if you wanted.
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Old 02-11-2013, 07:36 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

Quote:
Originally Posted by padgett View Post
My understanding was taht two of the gears, 2nd and 3rd (have also seen as 2'), were so close together that one is used going up and the other when downshifting. The first four are 3.00, 1.67, 1.50, and 1.0.

Planetary gearsets are like that, could have multiple reverse gears if you wanted.
This is exactly correct. For 2012, they simply adjusted the computer programming to allow you to manually select it (if you put it in autostick from 1st gear you will be able to up shift to 2'/3rd gear), and marketed it as a wonderous new 6 speed transmission.

They are the same transmission, with the same gear ratios, with that slight software difference. There is no efficiency bonus, performance bonus, or in general anything making the 6 speed better than the 5 speed, because again, it is the exact same transmission with a slightly reprogrammed autostick.

It's worth mentioning that the 6 speed auto does NOT use all 6 gears when you accelerate normally, it still uses the normal 5, and can use 2'/3 as a kickdown (as normal) or as a manual selection via autostick.
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Old 02-11-2013, 08:26 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

Actually if you want to save a few beans, all '11's built after May 1, 2011 were flashed to the 2012 spec. My '11 Summit was built in July '11. When you are looking, two tell tales- the door plate (will have month and year of mfg) or if the original sticker is still around...the units with the $49,200 base msrp.
There is a lot of archived info on this subject somewhere on this site.
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Old 02-11-2013, 10:06 PM
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Re: 2012 5 or 6 speed? Confused? (Hemi)

Morris Garage ?
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