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6.0L / Allison Combo???


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#1 cmadz71

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Posted 13 October 2005 - 03:01 PM

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?

#2 sstimothy

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Posted 13 October 2005 - 03:11 PM

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.

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#3 TieRod

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Posted 14 October 2005 - 02:46 PM

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. :chevrolet:
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#4 vhato

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Posted 14 October 2005 - 04:38 PM

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.

Edited by vhato, 14 October 2005 - 04:39 PM.

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#5 Jake99Z71

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Posted 16 October 2005 - 09:46 AM

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.
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#6 silverado3500

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Posted 16 October 2005 - 04:46 PM

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.
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#7 Jester4736w

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Posted 16 October 2005 - 07:17 PM

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?

#8 Ranger

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Posted 16 October 2005 - 07:26 PM

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?

<{POST_SNAPBACK}>


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.

#9 Jester4736w

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Posted 16 October 2005 - 07:28 PM

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.

#10 rcpd34

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Posted 17 October 2005 - 09:08 PM

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.

<{POST_SNAPBACK}>

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.
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