6.0L / Allison Combo???

[cmadz71]

Is this combo available? Does anybody have it? When I got my 2005 2500HD with the 6.0L/4L80E combo, I didn't think you could get the Allison with the 6.0L. I don't mind the 4L80E and has given me no problems so far but the Allison tranny is a nice piece. I like the available gear ratios in the Allison better than the 4L80E. What rear gear ratios would be available with this option?

[Shawn T]

Not available. It would be nice though. I think it takes quiet-a-few horses to spin the Allison 1000. They would have to enhance the 6.0L in the HD's to get the horses to the ground. Without the torque of a big block or diesel, I'm sure the fuel consumption of the small block would not be cost effective. I'm not a mechanic, so I may be way off-base though.

[TieRod]

According to the diesel boys the Ally is RPM limited. They keep telling me that it will come apart above 5000rpm. I think thats kinda silly. I turn mine 5500-6000.

[vhato]

The Allison 1000's Gear Box was built to support ~ 1400 lbt of *shift* torque and transfer 600+lbft during acceleration. According to GM, the Allison can safely do this at no more than 4850 RPM.

 

I was told that if you reduce engine torque, the transmission can spin higher. So a Vortec 6000 or Vortec 8100 could spin the Allison 1000 higher than 4850 RPM since they both have much lower torque outputs.

 

I can only clarify some of this information though.

 

The Allison does have a big first gear edge and a tad better OD. I would like one too.

[Jake99Z71]

The Allison 1000's Gear Box was built to support ~ 1400 lbt of *shift* torque and transfer 600+lbft during acceleration.  According to GM, the Allison can safely do this at no more than 4850 RPM. 

 

I was told that if you reduce engine torque, the transmission can spin higher.  So a Vortec 6000 or Vortec 8100 could spin the Allison 1000 higher than 4850 RPM since they both have much lower torque outputs.

 

I can only clarify some of this information though.

 

The Allison does have a big first gear edge and a tad better OD.  I would like one too.

 

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It would be best to use an 06 or 4th gen Allison as they have increased the rated rpm limit of the parts.

[silverado3500]

I think its also GM's idea, that the 6.0 "doesn't need" an allison or a 6 speed manual. Personally I'd love to see them drop the 5 speed and use the ZF 6 on all their engines in a 2500 and up trucks, and give a choice between the Allison or 4L80-E on all engines as well.

 

I'm not 100% sold on using an Allison on a gas motor (partially for the reason mentioned above). The 4L80-E can handle plenty of power with ease.

[Jester4736w]

All this talk about 5 and 6 speed... It actually seems nice to shift. Maybe when i upgrade in 6 years to a Duramax ill get the standard. Who knows, also seems kinda tiresome after a while.

 

What lasts longer standard or auto? More durable, able to take the punishment of beatings?

[Ranger]

All this talk about 5 and 6 speed...  It actually seems nice to shift.  Maybe when i upgrade in 6 years to a Duramax ill get the standard.  Who knows, also seems kinda tiresome after a while.

 

What lasts longer standard or auto?  More durable, able to take the punishment of beatings?

 

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It depends on how much experience you have with stick shifts. If you've learned enough not to grind the gears 90% of the time, then the clutch on a manual ought to last a long time. Autos are supposedly not that good and it's apparent from the gear ratios they suffer some performance loss, but the Allison is supposed to be a pretty tough transmission. I've known a couple people with Allison/Duramax 2500s and they pull heavy equipment (like bulldozers and tractors) on a nearly daily basis and their trucks are still running good. Personally I like autos because I do mostly city driving and it's a pain in the ass to have to upshift and downshift every 10 seconds.

[Jester4736w]

Yea standard is no problem... Primarily everything ive owned to this point was standard. But by the sounds of it the Ally is a very rugged tranny.

[rcpd34]

Yea standard is no problem...  Primarily everything ive owned to this point was standard.  But by the sounds of it the Ally is a very rugged tranny.

 

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I was also told the the 6.0 doesn't need the Ally. I love mine w/the 8.1 and would have bought it w/the 6.0 too for snow plowing.