Camarogenius

I'm the "one percent" in the truck world. (read my sig). I am planning on "Uptrucking" to one of the 5500 series w/ the 6.7 and a manual tranny.
I realize that I have a year to wait, since the quad cab 5500's won't hit the market until spring, '08, but my question is about high performance upgrades for the 6.7.
What's available, and what's in the works? What kind of numbers can you get out of them?
What are the down sides to the 6.7? On another board I belong to, I read doom and gloom over the 6.7's siamesed cylinders, and how they're gonna cause over heating, and higher egt's. Truth?

Forrest Nearing

no truth. they are semi-siamesed w/ water still flowing around them. all the strength without any cooling problems

EMD-RUN8

I wouldn't worry at all about the siamesed cylinders. This engine has already been around several years haulin' more weight than most any of us will ever see. Also, I'd take a REAL hard look at the Aisin automatic. It is a fine piece, should easily outperform a G56 and have a taller overdrive to boot. It is not a "new" transmission and already has a proven track record behind it as well. I've driven a 6.7/Aisin combo 3500 Regular CC and it was VERY impressive! You owe it to yourself to at least try one.

Camarogenius

I just don't like automatic transmissions. I don't think an auto will ever equal a manual in fuel mileage, or durability.

qzilla

I am extremely impressed with the new 6spd auto tranny. The strategy for shifting, downshifting and converter lock up is perfect and on my best day I do not think I could improve it!

I am very, very pleased with the auto and I think you will be too!

rstone

qzilla have yall work on anything for the new 6.7

qzilla

The Commander works on them but, we have not released the update as we are also adding the 6.4L to it at the same time. SHould be up later this week.

rstone

qzilla is there going to be a way to pull egt off the ecm like the boost. It look like there a probe going in to the manifold just wondering.

Danderson

This Aisen will,try 'em both. If I didn't need the Mex.diesel compatability,I'd of ordered a C&C '07.5 auto. Aluminum flatbed and my popup would have been nice. I do like this '07 though.

Gottlos

We got our first 6.7 in two days ago. Holly hell what a performer. Once the turbo get fully rapped up the truck takes as fast if not faster than the HEMI. The only thing I didn't like was the shifting of the new 6spd. auto. I drive a 4spd. daily and the shift points felt weird. The upshifts were fine the down shifts were just different. Another strange thing is to pull the shift lever down for low and have it stop at drive. I do like the manual shift switch on the shift lever though.

Don't tell the boss I lit up the tires on the truck a couple of times.

qzilla

That probe is for the EGR system and the way it is setup up you would not consistantly get what you want out of the probe in my opinion. It does not have a high importance level and I do not think it is updating fast enough or often enough to be used for a true EGT gauge.

We are still playing with it though and that would be flat out awesome if we could use it!

Camarogenius

That may be. If you prefer automatics, that's fine. I just like having a stick and a clutch. I can't imagine a scenario where I'd actually "want" to drive an automatic. I like shifting.

Enough about slush boxes already!!! What kind of numbers are they going to be able to squeeze out of the 6.7?

Luke S

I am a dealer. I have driven and pulled with 6.7/Aisins and have been very impressed. Hauled two one ton quad cab duallys on our 48' stepdeck behind a 6.7/Aisin and it performed better than any combo I have owned to date, and I have had them all, 5.9/G56/NV5600/NV4500/48re/47re/getrag. Aftermarket performance means little to me, I just want longterm relaibility. The Aisin and the exhaust brake are a hell of a combo to beat, I think it'll be the new standard.

The Aisin will surely hold together as good or better than your NV4500.

grantx5

You always put things in perspective Luke.

Luke S

Production starts on those July 31st 2007. They'll be hitting lots by late august into september.