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Discussion Starter #1
I have a 4.61 version juice on my 01 D/A. I am running normal and T/H on level 2 since I don't race and it gives me all I want. When the eng and tranny are cold the tranny seems to shift very hard. I don't get on it hard so the shifts are quick to get to OD. It just seems to much harder than when I was running level 3 or 4. Is this normal or do I have a tranny or juice problem?


Which level setting gives the best fuel economy. It seems I may have gotten a little better fuel economy in level 3 but I can't prove it without being able to drive the long trips which have stopped for now. Give me some insight into this please.


Tom
 

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The Allison is one smart cookie .... The Allison is learning and adapting ....

What is happening is your Allison has adapted to the extra ,all be it at lower levels, the extra torque your giving it,at operating temps ... Therefore it is shifiting accordingly,but the added torque isn't there,cold ...

Just a LIL hiccup cold, the juice isn't turned on till near full operating tempature of the Engine ...Built in safety if you will .. No one should be jumping on a cold engine and tranny ... So yes there could be a lil harsher shift when cold,without doubt ... Take it easy for the first few miles (I'm sure you do any way being it's cold ) and it will be fine .. You shouldn't experience any ill effects the Allison it is one HD tranny ..... Fuel econo is all in the right foot IMO at any level .... Key is to get it into OD and stay in OD as long as possible ,at moderate RPM's below 70 MPH ....

Mac

Edited by: Mackin
 

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Fuel econo is all in the right foot IMO at any level .... Key is to get it into OD and stay in OD as long as possible ,at moderate RPM's below 70 MPH ....



You mean it goes below 70 other than the first few seconds?
 

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I don't think Mackin's truck can go that slow!!


His speedometer starts at 80!!



hheheehehehehee


Bob
 

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By the way I get some harsh shifts when cold as well. I am running level 4 on my oj so the girl is used to POWER, not that stock stuff..hehe


My 1-2 shift seems the harshest, the rest are relatively smooth when cold. No worries. Wait for the power and kick the tires!!


Bob
 

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Discussion Starter #6
Thanks for your input. I don't get on it cold. I read so posts about hard shifts and was just wondering if I getting something I shouldn't get. I love this truck. I have had a bunch of them over the years and none of them can come close to comparing to this one.


I think many others are seeing the light as well. I have seen a lot of Duramax equipped GM trucks since I came back home from Amarillo and I think Amarillo and the TX panhandle has the largest number per captia of any place in the country They are everywhere. Those farmers and ranchers use bunches of GM products including every version of SUV to go with the trucks.


Tom
 
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