View Full Version : New tranny's in the works:

Prince Valiant
03-20-2008, 11:48 AM
Just putting some stuff in for tranny developments....

It's looking like around 2010, Chrysler will begin to use two new automatics. Now, these aren't automatics as we are used to seeing, but an automatic manual.

For FWD cars, it'll be a six-speed unit. For RWD cars, Trucks, both HD/otherwise, it'll be a SEVEN-speed unit.

The FWD units will be rated for 370ft-lbs max, while the 7 speed units will be rated for as high as 850ft-lbs of torque and for use in vehicles with GVWR as high as 26,000lbs.

Some of the patents being used suggest that these may also form the basis of a new manual trans as well, or a selectable option b/w the two as one patent is for using a clutch pedal with this transmission.

It's a dual clutch unit...but not dual clutches as we'd normally see. As it's described, one clutch will be used for gears 1-3-5 (and 7) and another for 2-4-6. This allows the gear to already be engaged and awaiting one clutch to engage/other disengage for seamless shifting...thus promising smoother operation than current automatic manual based units from BMW, toyota, Ferrari/maserati. Sadly, the units from these manufactuers has dampend public opinion of these units dramatically, but they also each operate vastly different than this upcoming unit does.

Some of the advantages of this unit over current automatics:
mechanically more efficient
greater number of ratios
should be mechanically more reliable

The pay-off should be increased acceleration while decreasing mileage. 10% better acceleration with 10% better mileage was quoted due to lighter weight, better ratio's, a gains in mechanical efficiency.

They are predicting that cars will recieve these first behind the upcoming phoneix engines, with trucs to recieve them later.

03-20-2008, 03:45 PM
They're really expensive to make. It's hard to make a dual-clutch transmission strong enough to take giant changes in rotational velocity when you're talking about large amounts of momentum.

I'm willing to bet they torque manage the shit out of them. "It'll take 700ftlbs of torque... as long as you're not shifting".

Take an Allison transmission, say an Allison 1000. It takes all of its abuse because it's a bandless transmission and can get rid of heat quite easily.

03-20-2008, 03:46 PM
i was worried to open this at work

70 cutlass 442
03-21-2008, 10:26 AM
so 30 years of replaceing transmissions every 50K miles and they finally decide to come out with a new family of tranmissions. and they wonder why they have financial issues.

04-07-2008, 12:04 PM
so 30 years of replaceing transmissions every 50K miles and they finally decide to come out with a new family of tranmissions. and they wonder why they have financial issues.
:rolleyes: You're exaggerating a bit much.

04-07-2008, 12:12 PM
:rolleyes: You're exaggerating a bit much.

The 727 was the last good transmission. The 999 was alright, but a bastardized 727.

Chrysler is so retarded that they didn't want to pay for NV5600s in their diesel trucks so they created a knock-off of it and had to recall all the trucks before they could even sell them.

How many SUV platforms does Chrysler have?

04-07-2008, 12:44 PM
Currently? Err... *counts*

There's the Jeep Wrangler, the Liberty/Nitro, the Durango (which may be on the same platform as the Dakota, I can't remember), the GC/Commander, and then there's two platforms for the small Jeeps that just came out.