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Old 06-08-2017, 05:26 PM   #51
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Is there just no room for the Allison trans in there or did they choose the 6L90 for cost reasons?

I'd love to see this van on a lift so I could get a better idea of what's going on with the Duramax vans.
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Old 06-08-2017, 05:30 PM   #52
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Great question. From what I understand its both. Room could be made but it would cost extra to modify the floor and doghouse area a bit. That along with the extra cost of the Allison adds up to more than what I think most users for the vans need in terms of capability compared to dollars they are willing to spend. Having said that, the Duramax was still a spendy add. The 6l90 is really smooth though and I'm happy with it. If I blow it up I'll need to call somebody. Are you doing Allison swaps for GM vans yet?....
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Old 06-08-2017, 05:39 PM   #53
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Oh yea, and I weighed it. 7700 lbs with no people, 3.5 rows of seats and 15 gallons of fuel.
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Old 06-08-2017, 05:51 PM   #54
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Quote:
Originally Posted by WhitH View Post
Great question. From what I understand its both. Room could be made but it would cost extra to modify the floor and doghouse area a bit. That along with the extra cost of the Allison adds up to more than what I think most users for the vans need in terms of capability compared to dollars they are willing to spend. Having said that, the Duramax was still a spendy add. The 6l90 is really smooth though and I'm happy with it. If I blow it up I'll need to call somebody. Are you doing Allison swaps for GM vans yet?....
I can do an Allison swap if you want one.

It's probably not worth it unless you're making hot rod. For a van, I'd tune for mileage and heat management, not big power. That's what I'm doing with my Cummins van. I could probably get up over 1200ft-lbs really easily with the setup I have but I'd be fine with half that amount of torque if it meant 20+mpgs, high teens at least.
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Old 06-08-2017, 05:58 PM   #55
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Yep I'm mostly kidding. I'd estimate I'm at a little over 300 hp and 600 lb ft. This tranny should be fine at those levels I'd think. I'm fine with it. Can I still say tranny when talking about automotive parts?

Oh and that reminds me, I did a freeway and 2 land trip the other day totaling around 150 miles at basically no elevation gain. Speeds were 55-75 and I averaged 17.5 mpg.
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Old 06-08-2017, 07:01 PM   #56
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Just for info, had my van weighed with nothing inside (stripped cargo van, with two seats), and 1/4 tank of fuel. It weighed 5700 lbs. -Certified scale.

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Old 06-08-2017, 10:00 PM   #57
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Wow that's a big difference! I guess between the engine, extra battery, jank on my roof, seats, extra flooring insulation (I put got most of a horse stall mat under the carpet) etc. that's how I get there. Still seems like a lot.
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Old 06-12-2017, 01:42 PM   #58
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Thanks for the report WhitH. Great info. Think I will adjust my torsion bars as well.
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Old 06-12-2017, 04:07 PM   #59
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Easy to do but be careful and not break the heads on the adjustment bolts. They can be potentially seized up. Jack it up to take the pressure off and then crank away and drop and check.
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