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2500HD/3500 HD Trucks & Drivetrain Discussion Forum for the 2001 & newer 2500HD/3500 Trucks, Transmissions & Drivetrain

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  #1  
Old 02-28-2008, 04:24 PM
GMC-RKL GMC-RKL is offline
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Default No more manual transmissions in a Duramax - why?

I currently own a Chevy Silverado Duramax HD 4x4, with a 6 speed manual transmission. Yet I am disappointed to discover the new 08 Duramax Diesels that GM is offering, you cannot order one with a manual transmission.

I know there are fans of the Allison transmission out there, but I am a die hard manual transmission guy; all the vehicles I have ever owned had a manual transmission.

If GM does not offer another Duramax Diesel with a manual transmission, I may be owning a Dodge Ram 2500 powered by a Cummins Diesel with a 6 speed manual transmission.

Are there any thoughts as to what is going on at GM that would warrant their offering of the Allison transmission only and not having any manual transmission option available? Inquiring minds want to know.

RKL
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  #2  
Old 02-28-2008, 05:46 PM
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xtrempickup xtrempickup is offline
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the Cummins is a good choice, but im still not sure about the new ones, the 5.9Ls are known to be the million mile motor, this new one im not sold on yet. at least its not a mercedes, those cars, no manuals offered at all
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  #3  
Old 02-29-2008, 08:41 AM
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I'm with you on this one. I specifically searched out a manual, and it was no easy task given their scarcity, so I guess therein lies the answer: people didn't buy them in sufficient numbers to warrant their production.

The reason I prefer a manual is that I feel I have way better control than driving an auto, and I only use the brakes to come to a stop. Having said that, I would welcome the opportunity to try the 6-spd Allison with the gear select (arrow up or down) on the gear-shift arm. That way I could hold it where I wanted on grades and still have the ease of auto in town.
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Old 02-29-2008, 08:48 AM
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80Sierra 80Sierra is offline
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My new service rig had an allison with the "manual" transmission option, and while I always drove the truck that way, it still didn't work like a real manual does.

I personally won't be buying a new GMC becuase of that very reason. I'm not sold on the new Cummins either, so I may wind up behind the wheel of a new Powerstroke / 6 speed instead. I have a buddy who bought a brand new 6.7L cummins, and claims that it goes like crazy, but gets absolutely terrible mileage.
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Old 02-29-2008, 09:12 AM
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JohnC JohnC is offline
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My guess as to why:

Two reasons.

First, I doubt if they sold enough manuals to warrant the costs involved in developing and certifying the emissions to make it profitable.

Second, I expect emissions certification is a lot more difficult with the manual. With the automatic they can simply program out conditions that result in excessive emissions.

Remember, too, the manual D-max is derated compared to the automatic, so there must also be some durabuility issues.
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Old 02-29-2008, 10:33 AM
gophergunner gophergunner is offline
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Russell i think all the new diesels have terrible fuel mileage.....doesn't that come with the high HP numbers?

aside from that, i think they like selling the automatic transmission trucks because they charge more. When i was pricing out my truck, i recall i could have gotten the 6 speed manual, but i was firmly told that it was damn near guaranteed to not last as long as the allison (when driven under normal conditions).......and of course 300 hp instead of 360. But i also remember the extra cash of around $3xxx for the allison transmission option.

i could have put up with the 60 less horsepower, but it was the fact that i was trusting the guys at the dealer when they told me the allison will outlast the manual.

i guess time will tell, and i settled for the auto anyways and have no real complaints other than leaky cooling lines.....but i would still rather enjoy driving a new diesel with a 6 speed manual. I won't settle for ford, and dodge hasn't won me over just yet
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Old 02-29-2008, 05:47 PM
Bravo Whiskey 21 Bravo Whiskey 21 is offline
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The duramax has soo much torque it was wrecking the manuals.
I do not drive for a living but towing my boat thru the PA mts. and my dump trailer using the '06 allison in manual mode is fantastic. I almost never have to touch the brakes. When I fish the NJ shore I end up coming up thru the Blue Rt or "SureKill " expresss way towing my Whaler.Tough roads as most of the way is only 2 lanes. Just push the tow haul mode button and I 'am not getting cut in front and can deal w/ the short stops/fast start ups that come w/ an outdated highway.
I drive stick, learned @ 11 yrs in F350 SA wrecker ,driven many since, but I feel the Allison is overall a better choice then a stick.
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Old 03-01-2008, 01:14 PM
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Hook_'em_Horns! Hook_'em_Horns! is offline
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Quote:
Originally Posted by Bravo Whiskey 21 View Post
The duramax has soo much torque it was wrecking the manuals.
I do not drive for a living but towing my boat thru the PA mts. and my dump trailer using the '06 allison in manual mode is fantastic. I almost never have to touch the brakes. When I fish the NJ shore I end up coming up thru the Blue Rt or "SureKill " expresss way towing my Whaler.Tough roads as most of the way is only 2 lanes. Just push the tow haul mode button and I 'am not getting cut in front and can deal w/ the short stops/fast start ups that come w/ an outdated highway.
I drive stick, learned @ 11 yrs in F350 SA wrecker ,driven many since, but I feel the Allison is overall a better choice then a stick.
I’ll have to agree. Many years ago, I gave up on ‘disposable’ automatic transmissions and drove hand-shakers for 16 years. The Allison has changed my mind, all of the benefits of control from the manual and no sore knee from driving in heavy traffic. The best part is…no more clutch jobs every 80k miles.

Incidentally, the most recent demographics show less than 15% of the population can even drive a stick much less own one. I believe the popularity of the manual in the Fjords and Goats has been due to the crappy Auto that was available in the past. Now that Fjord has the Torque-Shift and the Goat has the Aisin, things will probably change on those too.
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  #9  
Old 03-01-2008, 02:32 PM
93_Burrito 93_Burrito is offline
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GM insists on using a dual-mass flywheel in front of the manual tranny to keep the chatter down. Doing so creates the reliability issue. GM can't make a durable flywheel in this manner. The aftermarket provides excellent solutions to this problem, though. Want a solid flywheel? Okay. Want a double-disc clutch setup? You can have that, too, behind a Duramax.

A ZF-6 truck with 300 HP is still going to put down numbers very similar to a 360 HP Allison truck at the rear wheels. The automatic has greater parasitic loss.

Of course GM is going to sell fewer manuals if the people assume they aren't out there to be had. And people will only search for so long before they get fed up and settle for something they didn't really want. Or they shed their brand loyalty and move on to another company who will give these people what they really want. Like manual transmissions and solid front axles...
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  #10  
Old 03-01-2008, 08:19 PM
gophergunner gophergunner is offline
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if they made the transmissions with many gears and close gear ratios so i could shift like a big rig then i wouldn't mind driving a manual pickup in the city........but since they don't make them like that, i have to admit that the auto sure makes life easier on my left leg.
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