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  #13  
Old 01-08-2012, 12:06 AM
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Re: Buying 5/6 speed a mistake?

So it will probably be something like 27 - 28 combined mpg
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Old 01-08-2012, 03:13 PM
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Re: Buying 5/6 speed a mistake?

Hey guys, I sold my stroked out WK1 on Christmas day and am looking at WK2's. Thankfully my dad has a company vehicle, so I am able to drive his 06 Tundra that has just been collecting dust in the garage the least few years. It'll be nice to be without a car payment for a few months while i decide what i want to get.

I sold my WK1 as i had the 545rfe rebuilt/replaced 5 times and wasnt willing to do it a 6th time. I was completely honest with the buyer and showed him how 4th and 5th were slipping. Im sure this was due to me topping out the speedometer a time or two, and having too much power with 32" tires at high speed. It'd do about 130 in 3rd gear and I think 4th gear was just too tall and slipped.

So having said that, im wanting a more reliable tranny.

Question #1: Is it true the only difference between the 11/12's is updated TCM programming? Someone posted a link (i think just wk jeep .com) that showed the 12's had a 68rfe or some other model. To me this would indicate it's more than just software.

Question #2: Will the new 8 speed tranny only be used in the diesel and v6 powered WK2's? If it won't be used on the hemi there's no point in me waiting until the 13's coming out.

The only mods i think i'd do to a WK2 would be upgraded exhaust manifolds/ intake / and a cam. Of course that'll all need to wait until someone comes out with a programmer.

Thanks!
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Old 01-09-2012, 11:13 AM
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Re: Buying 5/6 speed a mistake?

The Hemi with the 5-speed is awesome; there is no need for more gears. I can cruise at 80 MPH on four cylinders (MDS engaged) and get over 20 MPG. And when you stomp on the gas the Hemi roars and this heavy vehicle accelerates well. I considered waiting years for the 8-speed, but that would have been a mistake.
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Old 01-09-2012, 11:32 AM
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Re: Buying 5/6 speed a mistake?

Quote:
Originally Posted by WK2 Rover View Post
The Hemi with the 5-speed is awesome; there is no need for more gears. I can cruise at 80 MPH on four cylinders (MDS engaged) and get over 20 MPG. And when you stomp on the gas the Hemi roars and this heavy vehicle accelerates well. I considered waiting years for the 8-speed, but that would have been a mistake.
sorry for being a noob, but i thought the hemi was 6-speed and the pentastar was 5-speed? Am i missing something?
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Old 01-09-2012, 11:48 AM
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Re: Buying 5/6 speed a mistake?

The Hemi had a 5 speed in 2011.

The Hemi has a 6 speed in 2012.
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Old 01-09-2012, 12:08 PM
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Re: Buying 5/6 speed a mistake?

No offense to the OP, but how can you call the tranny unreliable when it sounds like the damage was all self inflicted? You said it yourself you had lots of power, huge tires, and probably drove the piss out of it. I'm not knocking you, just saying that I dont think the tranny has issues, it was the mods. That's like me expecting the very reliable 6spd manual in my Z06 vette to handle 800hp when the car was designed to have 500. Stuff is going to break. All I'm saying is that the trannies in the current jeeps are reliable. Most people don't add HP to Jeeps with 32" tires then go top out the speedometer lol.

James
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Old 01-09-2012, 08:55 PM
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Re: Buying 5/6 speed a mistake?

Thanks for the comments guys. I didn't abuse the truck, but i did use the extra power from time to time. I know i had it coming to some extent and am not complaining. I strapped a magnuson s/c, heads, cam, flywheel and N2O on my CTS-V and wasnt surprised at all when my rear differential eventually blew up on me. The WK was supposed to be my "keep stock" daily driver and of course one thing led to another.

Point is, i had a lot of transmission related issues and dont want anymore. So if waiting another 5 months will result in a newer better tranny its worth the wait in my case since im in no hurry to buy.

So my questions again Is the following correct?

2011 WK 5.7L - 545RFE "5-speed" Transmission
2012 WK 5.7L - 65RFE "6-speed" Transmission
2013 WK 8 speed tranny only applies to diesel and V6, 5.7L remains 65RFE?
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Old 01-09-2012, 08:56 PM
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Re: Buying 5/6 speed a mistake?

Ah ha! I can't believe a software update results on a new part # but it appears that is the case:

"65RFE

The next six speed derived from the 545RFE was the 65RFE, initially used with V8 versions of the Ram 1500, Durango, and Grand Cherokee. The 65RFE does not have six forward gears in regular automatic mode, only in ERS/AutoStick mode; it is essentially a software and name change, which allows people to reach the “prime” gear via ERS rather than kickdown. An internal Chrysler communiqué to dealers summarized the change in a similar fashion.
"


So if there's no real difference in the hemi trannys from 2011-2013 then i may just keep an eye out for some used 2011's
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Old 01-09-2012, 09:40 PM
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Re: Buying 5/6 speed a mistake?

Quote:
Originally Posted by CaptRB View Post
With all of the chatter about the new and excellent 8 speed tranny coming to both of the Cherokee engines I'm wondering if buying a 2012 would be a moderate-sized mistake.

For:
1) The 8 speed should add performance to either engine.
2) It will also improve fuel economy and probably allow lower revs at high speed.
3) The 8 speed Cherokees will murder resale on the 2011-2012 models.

Against:
1) Buyers will have to wait 6 months at best. It's unlikely that the 8 speed will actually show up before next fall. Then again....
2) Is this 8 speed going to have some bugs and jitters to start? That's always a worry.
3) There seems to be some who feel the 5 speed (I've read that the 6 speed in the Hemi is really the same old 5 speed) is still going to be more rugged and dependable.

So...what am I missing? How long or short of a wait are we looking at? I was planning to buy in the spring, but now I'm thinking I'd be smarter to wait. Then again, my Outlander is going to need 2K in suspension, timing belt and tires in the spring! Ouch.



Robert B
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I suspect that in terms of both fuel economy and performance, there wont be much of a difference. I get about 20 or 21 in the summer with my cruise set at 82MPH in my Hemi, with no traffic and a constant speed. Also, although many on this forum are very knowledable about things like this, the average used car buyer wont have a clue about the 2013's having a different trans than the 2012's. I would expect very little diference in terms of resale value. My 2011 5/6 speed with the software update that makes it identical to the 2012s is very responsive, and near perfect when in sport mode. The main reason that transmissions with so many gears have become so popular is because they greatly benefit small displacement motors like turbo 4 cylinders, it wont make much of a difference with the torque curve of the Hemi.
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Old 01-09-2012, 09:51 PM
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Re: Buying 5/6 speed a mistake?

My cousin bought a brand new 8 speed Charger and he's getting 32mph city. Just thought I'd share that.
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Old 01-09-2012, 09:56 PM
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Re: Buying 5/6 speed a mistake?

He's getting 32 MPG with the Hemi in the CITY with the 8 speed????


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Old 01-09-2012, 10:33 PM
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Re: Buying 5/6 speed a mistake?

Quote:
Originally Posted by 555ctsv View Post
Ah ha! I can't believe a software update results on a new part # but it appears that is the case:

"65RFE

The next six speed derived from the 545RFE was the 65RFE, initially used with V8 versions of the Ram 1500, Durango, and Grand Cherokee. The 65RFE does not have six forward gears in regular automatic mode, only in ERS/AutoStick mode; it is essentially a software and name change, which allows people to reach the “prime” gear via ERS rather than kickdown. An internal Chrysler communiqué to dealers summarized the change in a similar fashion. "


So if there's no real difference in the hemi trannys from 2011-2013 then i may just keep an eye out for some used 2011's
I read somewhere on this forum that the 2012 has a different and better torque convertor.
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