jmccart

Why do you-all think that the 6.7 is detuned 50 ft-lbs with the manual trans? Do you think it is related to clutch holding capacity or G56 strength?
Thanx.

C Schomer

The clutches now will hold but the new 6 spd auto must be tougher than the 6 spd. manual. Craig

ROOSTER108BM

The Duramax is detuned with the manual also.Torque is he## on a trans.

06dually

It is detuned 40ft lbs. There are plenty of stock G-56's running more than the stock 610 ft lbs. and they hold up.

kev94mx

I agree. In my opinion they do that to boost sells on the new auto. The new auto is a pricey option

MAKIN'SMOKE

I would imagine it would be the clutch that is the weak link on the man. trans.

jmccart

Thanx for the info guys. It seems that I read that guys with the G56 trannys are do what ever they want with no tranny probs (besides clutch slipping). Makes ya' wonder why Dodge nixed the NVG5600 and went with the G56.
Thanx.

53 willys

it's the clutch not the trans.
I would rather have 40ft lbs less and keep my standard. ( I have not been happy with my past truck's auto's )

53 willys

they did it to save money!! the G56 was already being made by MB so they could drop the NV contract and make everything in house so to speak.

quadstar

I wish they would have kept the nv5600. I owned two of those trannys, and now own one g56. I still prefer the nv, the g56 isn't bad yet, but that thing just refuses to shift nice and smooth. It is a bear to get out of reverse

53 willys

mine shifts like butter even my wife thinks so.......























but she does have to use BOTH hands to get it in reverse!!!
and she still let me get a standard trans!

tbone

Are you talking about the Chassis Cab? You must be because it is the only one with the 6 speed auto. The whole package is detuned compared to the regular trucks.

D.Wiggs

Getrag makes one of, if not the best, manual in the auto industry. The G56 is superior in EVERY way to the NV5600 (I owned them both) and the reason that the auto is rated higher is exactly the reason that someone mentioned before. The auto option is so mucn more money (like the Duramaxes) that they need to offer some sort of performance justification for the price. I would never buy an auto on anything other than a semi (and even that is an Auto or Ultra-shift tranny) because of the need to double-clutch each shift (a nightmare for anyone who hasn't done it).

The G56 will definitely handle more power in stock form before giving up and is much easier to upgrade (just get a new clutch) than the auto.

But to answer your question; it's all marketing.

PourinDiesel

Its simple. They are worried about the G56.
Its nice that someone brought this up.

The lower power rating just shows that even Chrysler has no faith in their manual tranny either.

When the first HO came out it was limited to only the Manual NV5600.

Now its the other way around. Its not all marketing.

D.Wiggs

That doesn't really make any sense. Manual tranmissions are much more capable of handling high power than are autos. Autos have a lot more that can go wrong and are much more suceptable to breakage than are manuals. Also, it's no mistake that now all 4 truck manufacturers have higher ratings for their EXPENSIVE autos. They want people who want power to get the autos so they can make more money. Just simple economics. It's also one more thing that the driver cannot control. Same reason that so many exotics even (e.g., Lambo, Ferrari) are going to 95% "E-gear" or computer controlled manuals. That way the computer has the final say, not the driver and thus cannot do anything that the manufacturer did not intend.