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  #11  
Old 01-13-2012, 06:09 PM
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Quote:
Originally Posted by GTyankee View Post
BRAD is correct, although it may only be the spring rate that was changed in the valve body
the torque converter was also changed, better clutch in it

in 2013 the new 8 speed ZF designed transmission will be in the Rams
Are they really going to put the 8 speed in the Rams in 2013?

All the searching I've done said they wouldn't because the hemi engine makes too much torque for it. I find that very hard to believe, but that might explain why they put it in the 300's first. I've ridden in a new 300 with the 8 speed and it's quite peppy for a 6 banger. My guess is they will likely upgrade the 8 speed internals then throw it in the Ram. I can't wait to see it.

What's next a 12 speed..lol
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  #12  
Old 01-14-2012, 01:03 AM
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I am always nervous when they make big changes to things. When major changes happen (new generation, new engine, transmission, etc) are put into a vehicle, I try to wait one year before I do anything. After one year you can get a pretty good idea if there are any problems. Plus it gives the engineers an extra year to get some real world feedback from users to work out any issues.

The eight-speed transmission might work great in a car, but a car and a truck do two different things.
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  #13  
Old 01-15-2012, 04:14 PM
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Quote:
Originally Posted by storeboy View Post
The eight-speed transmission might work great in a car, but a car and a truck do two different things.
If you think about it semi trucks have had 7, 8, 9, 10 and all the way up to 18 speed transmissions for years. You get the best of both worlds. Low end torque and acceleration and high speed gearing all in one.

I test drove a Lexus LS460 a few years years ago. They were the first car builder to offer an 8 speed transmission in a car. The salesman was a young guy and told me to "go for it" when we pulled out on the highway. I mashed the pedal and we took off like we were shot out of a cannon. It blew threw 100 mph hard just before I let off the gas. It felt like it was just starting breath around a 100 and had so much more left. From a dead stop that car left the line hard and it felt like it could pull stumps out of the ground. Although I wouldn't recommend that with e $90,000 car though, it felt that strong down low.

The tranny on that Lexus was butter smooth and you could hardly tell it was shifting cause the gears were at such a close ratio. I can't wait for the new Rams to come out with an 8 speed tranny if it's true. I just may have to make a trade if and when it does...
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  #14  
Old 01-15-2012, 09:43 PM
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The 8-speed isn't exactely new, it's been in the fiats for several years, it'll just need to get reprogrammed for the LX cars. I don't remember hearing if they're planning on putting the 8-speed into the trucks, but if they do it'll probably be in the R/T and that's about it (<-personal opinion there)
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  #15  
Old 01-16-2012, 01:49 AM
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Looks like the eight speeds are coming down the pike in 2013....
Go to this link and scroll about half way down the page to the Ram pickup trucks section. Interesting info.
http://www.allpar.com/model/upcoming.html
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  #16  
Old 01-16-2012, 01:56 AM
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Quote:
Originally Posted by brad12kx View Post
It's not looking good.
The 45RFE, 545RFE & 645RFE are all the same mechanics, but there appears to be a difference in the valve body that prohibits 'flashing' them to have the capabilities of the modernized version.
Quote:
Originally Posted by GTyankee View Post
BRAD is correct, although it may only be the spring rate that was changed in the valve body
the torque converter was also changed, better clutch in it

in 2013 the new 8 speed ZF designed transmission will be in the Rams
Have a looksee at this page. Looks like its just a sofware change to convert the 545RFE to the 645RFE where as the 68RFE got all the internal/parts changes. http://www.allpar.com/mopar/transmissions/545RFE.html
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Old 01-19-2012, 12:26 AM
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Quote:
Originally Posted by Airdog View Post
Have a looksee at this page. Looks like its just a sofware change to convert the 545RFE to the 645RFE where as the 68RFE got all the internal/parts changes. http://www.allpar.com/mopar/transmissions/545RFE.html
If this is truly a software upgrade, that would be awsome! The million dollar question(s) though is where do you get the software, how do you reflash it, and what would be the side effects? It would not surprise me if it is a software upgrade, but my guess is that unless you have someone hack/crack the software nobody will ever see it; Chrysler will never offer it to anyone.

Just my .02
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  #18  
Old 01-19-2012, 12:58 AM
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Food for thought

The ZF transmissions have been in several makes of cars, Trucks, & farm tractors for years
it is a German designed transmission
there will be 2 transmission factories near Detroit, strictly for Chrysler products. Another factory is being built in Greenville, South Carolina
Most of the transmissions used by Chrysler will be made at the automaker’s Kokomo, Indiana, Transmission Plant but some will be built by ZF itself at a new transmission plant in Greenville, South Carolina. Chrysler is investing $300 million in the Kokomo plant. The new ZF facility, the first ZF plant to make car transmissions in the USA, will also make the 9-speed automatic transmission for transverse-mounted engine applications
Gear 1 ......2 .... 3 ...4 ... 5 .... 6 ....7 ... 8 ....R (RWD) R (AWD) Spread
Ratio 4.71 3.14 2.10 1.67 1.29 1.00 0.84 0.67 ..2.65 .....3.06 ......... 7.03

Chrysler Dodge is getting them now, in about 2 or 3 years, Ford will be getting them, talks are now under way, several Fords have been using them already

some other vehicles that have the ZF transmissions
5-speed longitudinal5 DS 25 - sequential transmission as fitted to the Ford GT40 MK1 and MK3, De Tomaso Mangusta, De Tomaso Pantera, Maserati Bora, Lancia 037, BMW M1, Saleen S7
S5D 310Z - as fitted to the BMW e36 M3 3.0[1]
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Last edited by GTyankee; 01-19-2012 at 01:08 AM.
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