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Now that the Ally has been changed over to a 6 speed I'm thinking the DMax would be one hell of a towing machine with a 4:10 rear end and still as economical as the previous 5 speed. RPMs in 6th should still be well below the 2000 @ 70MPH that the previous 5 speed ran. 1st through 5th would be the ticket for pulling, racing and towing.
 

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I would have to agree, I would like to see a 4:10 ratio myself. Then when I went to the taller tires my effective pulling ratio would be the same as a 3:73.
 

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I believe the 3500 has a 4:10 gear. That is how the GVWR and GCWR was increased.
 

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I believe the 3500 has a 4:10 gear. That is how the GVWR and GCWR was increased.
I don't think you can get a 4.10 behind a Dmax/Alli combo, only if you get the 8.1 gasser. I think the extra capacity, if there is any, would come from the extra 60 horses and a 100 ft.lbs. of torque.

I would have to agree, I would like to see a 4:10 ratio myself. Then when I went to the taller tires my effective pulling ratio would be the same as a 3:73.
That would be nice and to keep it the same you would have to use about a 3" taller tire, which would be just about right for a set of 285/75/16's for 2500's and maybe a 255/85/16 for duallys.
JP
 

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I believe the 3500 has a 4:10 gear. That is how the GVWR and GCWR was increased.

Nope, GCWR for 3500 SRW is 22,000 just like the 2500HD.

The 23,500 GCWR comes from the DRW option. All Diesel 3500s, even Chassis Cabs get the 3.73.
 

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GCWR is determined by the Allison's park pawl capability/capacity IIRC..

With the Dmax, you can only 3.73's in 2500/3500 trucks.
 

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the never offered 4.10's for the duramax, only the 5.3, 6.0, and 8.1 gassers. it would be nice to swap for 4.10's after a tire size change. it can be done as the differentials are the same for the 8.1L and duramax trucks. I be you could even find 4.56 if you had huge tires:)
 

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they offered it i believe starting in 04. check it out. if it wasnt the hd's it was the 3500 srw.
 

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One good reason would be the use of taller tires without sacrificing any performance...:D
JP
 

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If you use tires that are that much bigger than the OEM tires (2500 or 3500SRW), you could also just use fifth gear instead of sixth at highway speeds. But then you'll no doubt take issue with the overall ratio in first gear with larger tires.
 

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...But then you'll no doubt take issue with the overall ratio in first gear with larger tires.
Yeah, I think that might be the biggest issue, especially if towing/hauling heavy.
JP
 
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