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Discussion Starter #1
So why doesn't the vans with the Duramax come with the Allison trans?
Is it because its more expensive than the one that come with it?
Is it because its to big to fit in the van?

Also, what other vehicles have the same tranny that we have in the vans? Is it a good tranny, can it hold added power?
 

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LLY Guy
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Because of lack of space I believe
 

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i'm going to guess cost.
 

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The work to make it fit, etc would not be justifiable for GM since they sell so few Duramax vans compared to trucks.

The 4L85E is a great transmission which is a upgraded 4L80E that has been around for 20+ years.
 

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a) van never designed to fit a transmission as large as the Allison

b) it's not needed, even a 3500 van doesn't come close to the GVW and towing capacity of a truck

c) the 6L90 6 speed currently available can handle the job very well

I like the Allison, own one, but it isn't the end all be all of transmissions. You can put a lot of power through a good built 4L85E or 6L90E. I prefer the way the 4L85 shifts over my Allison any day.

The 6L90E is in a lot of current GM product...as was the 4L85E before the 6 came along. Lots of aftermarket upgrades available....if you need them.
 

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VANs rule.
 

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A properly built 4L85E will handle a lot of HP and quite a bit of Torque. My race truck is around 1000hp/tq and my 4L80E has lived behind that for 4+ years. Only time I had to pull the tranny out was when I blew out reverse...while on the fwy!! :/
 

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So why doesn't the vans with the Duramax come with the Allison trans?
Is it because its more expensive than the one that come with it?
Is it because its to big to fit in the van?

Also, what other vehicles have the same tranny that we have in the vans? Is it a good tranny, can it hold added power?
1- Cost
2- Cost
3- Cost
4- Look at the 1st three.

Basicly GM designed the D Max van without changing much. They sell millions of vans I bet over the years and the more simplified the assembly is the better. The alli would require different driveshaft, yokes, TCM, and wiring the other vans dont have.
 

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Do it!
 

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Discussion Starter #12
I'm interested!):h
 

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why are you keeping us in suspense??!
 

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Discussion Starter #14
turboawd why are you keeping us in suspense??!
Yeah, why?!:secret:???
 

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I'll start you off by saying that if you're going to do this, a 2007 LMM Van is probably the worst one you can pick. It is the stepchild of the stepchildren with regard to control modules. It does not have the same BCM and HVAC module that the LMM trucks do, which makes switching it to a truck operating system a lot more work than an '06 or '08. Figures. More on that later.

Mechanically, it's not a difficult job. We have a bunch of pictures and video that we're organizing now. We'll share it middle of next week. So try to keep your tongues in your mouth until then :). I will say that cruising at 80MPH is much nicer now!

Nick
 

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I'll start you off by saying that if you're going to do this, a 2007 LMM Van is probably the worst one you can pick. It is the stepchild of the stepchildren with regard to control modules. It does not have the same BCM and HVAC module that the LMM trucks do, which makes switching it to a truck operating system a lot more work than an '06 or '08. Figures. More on that later.

Mechanically, it's not a difficult job. We have a bunch of pictures and video that we're organizing now. We'll share it middle of next week. So try to keep your tongues in your mouth until then :). I will say that cruising at 80MPH is much nicer now!

Nick
why is that? lower rpms at that speed? notice any mpg difference? need more info!! :D
 

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1- Cost
2- Cost
3- Cost
4- Look at the 1st three.

Basicly GM designed the D Max van without changing much. They sell millions of vans I bet over the years and the more simplified the assembly is the better. The alli would require different driveshaft, yokes, TCM, and wiring the other vans dont have.
I worked at the Wentzville van plant. I guess you could say cost, as it would have required a major change in the floor plan.
 

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I'll start you off by saying that if you're going to do this, a 2007 LMM Van is probably the worst one you can pick. It is the stepchild of the stepchildren with regard to control modules. It does not have the same BCM and HVAC module that the LMM trucks do, which makes switching it to a truck operating system a lot more work than an '06 or '08. Figures. More on that later.

Mechanically, it's not a difficult job. We have a bunch of pictures and video that we're organizing now. We'll share it middle of next week. So try to keep your tongues in your mouth until then :). I will say that cruising at 80MPH is much nicer now!

Nick
Your holding out on us now:D
 

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I don't think it happened. If it did I think we would have seen some evidence by now. Maybe he was in the process and found out it's not as easy as he thought.

Your holding out on us now:D
 
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