The TCM sets the shift points. Changing it for the caddy unit might result in a not so good set of shift points for the sol's 4 cylinder.

I'm betting that BMW is right and that all you need to do is to jumper the connector correctly ahd hook a proper shifter to it.
No change to the TCM at all....


Here is an article about some of the 5L40E's capabilities...it's impressive.
http://www.skyroadster.com/forums/ar...hp/t-7954.html
Me

But the HP Tuners website doesn't note the CTS transmission as locked like it does the Solstice/Sky, which to me implies that it is accessible for changes. There you can change the shift points to accomodate the Ecotec characteristics. That is propably the route I will attempt for my project. I'm not exactly building a Kappa car.

I'm glad the 5L40E is so dependant on the TCM. I have seen the results of a tuned 4T45-E trans in the 2.4 Cobalt. With HP Tuners you can adjust the shift points and raise the line pressures to get more of a manual feel. It needed a trans cooler to keep the shifts consistant during aggressive driving.

Here is another GM spec sheet I found on the 5L40E. I like that it is rated at to handle 494 lb-ft of torque. Should work perfect for my application.
http://media.gm.com/us/powertrain/en...0(M82,MX5).pdf

I've tried many triptronic setups and they all kinda sucked.

Recently I drove the Audi TT with there new paddle shifter system. That was really nice. It shifted faster then a human could.

When you put it in the full competition mode(forget what it was) it won't shift until you hit the paddle or until you hit redline in the car.

It is very fast!!!

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I love the life but I never sold my soul...

Yeah that was probably the DSG trans. It is actually a dual clutched manual that is electronically controlled. One clutch has odd numbered gears and the other has the evens. It's pretty cool, but I'm sure it is really expensive to maintain or repair.

The Dual clutch sequential shifter is actually less expensive to build than an automatic.

Both Chrysler and Ford have committed to this transmission design for the near future production.

GM should step up to the plate and join the new technology thats less expensive to build, offer better performance, fuel economy and easier to control emissions.

The next GM vehicle I trade my C5 Z06 in for will have a dual clutch sequential.

If it were a solstice GXP coupe with a DSG I would be very pleased.

If its a corvette I wouldn't be disappointed either.

Great thread . Hope GM sold Allison transmissions recently to be able to put DSG in its product line..

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2008 Blk Corvette Z51 w/NPP and 2008 Silver AWD 304hp FE2 CTS

yes


Yes.

The transmission is still an automatic transmission. It is all marketing that you are buying into. Chrysler made push button transmissions that they thought would be cool 40 years ago. Unless you get the DSM or SMG or whatever Ferrari is using then it is just changing gears in your automagic. When it is electronically controlled clutch on a manual transmission car like an F1 then it is more than just looks.

I guess I hadn't thought of that much about it, but it probably would be cheaper with out the vavle bodies and other intricate parts. I would just hate to find out what happens when an actuator fails. I'm also curious as to how the clutches wear and how much they are. I guess if you are buying an Audi with the DSG you probably don't worry too much about that.

VW has dual clutch t3chnoloty. I think the only added expensie will two clutches versus one.

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2008 Blk Corvette Z51 w/NPP and 2008 Silver AWD 304hp FE2 CTS