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Old 07-17-2011, 09:50 AM
Ecoscapes Ecoscapes is offline
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duramax owners; how to make sure its got the Allison tranny?

I'm looking to slightly downgrade from my 07 F350 srw diesel into a truck with higher miles but less debt. Maybe it dosen't make sense because higher miles may mean more repairs but I'm patient to find a one owner diamond in the rough. I tried a newer chevy 2500 duramax the other day and it seemed more powerfull than the ford, didn't tow with it but the power was very much there, the ford seems sluggish with heavy towing, and I keep hearing good things about the allison tranny for towing. I"m looking at duramax's with 80000 miles or so, and want to make damn sure its got the allison. Is the only way to tell by the emblem on the side of the truck? I'm not a mechanic but there must be a way to make sure its the allison, by looking at the tranny for certain features? Thanks for any tips!
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Old 07-17-2011, 09:54 AM
cat320 cat320 is offline
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well i'm sure the allisons had the external spin on filet so if it has one of those i'm pretty sure it is an allison
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Old 07-17-2011, 12:21 PM
4B LawnCare 4B LawnCare is offline
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To the best of my knowledge, all of the duramaxs have the allison behind them. I think the vans did not.
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Old 07-17-2011, 12:41 PM
JDiepstra JDiepstra is offline
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I also believe all Duramax's come with the Allsion. Regardless, I'd still go with a Dodge with a Cummins. Something 04 - 07.
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Old 07-17-2011, 10:07 PM
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watatrp watatrp is offline
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The 8.1 gassers are available with the Allison also. Side note: I know a guy with a transmission shop. I asked him at one time what was the best transmission. He said an Allison. I asked him why. He said that he'd never seen one in his shop that needed a repair.
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Old 07-17-2011, 10:10 PM
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jimmyjack jimmyjack is offline
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if its a dmax its got a allison in it , its the only way them come if its a auto.....if its a stick if a zf6 and if its a dmax in a work van then ita 4L80E cause them allison wont fit under the hump in the floor
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Old 07-18-2011, 12:11 AM
rcslawncare rcslawncare is offline
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Quote:
Originally Posted by jimmyjack View Post
if its a dmax its got a allison in it , its the only way them come if its a auto.....if its a stick if a zf6 and if its a dmax in a work van then ita 4L80E cause them allison wont fit under the hump in the floor
Bingo!! Allisons are great trannys if you leave them stock. They go forever and really handle towing well. I loved mine
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Old 07-18-2011, 12:31 AM
Cornell Cornell is offline
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Quote:
Originally Posted by jimmyjack View Post
if its a dmax its got a allison in it , its the only way them come if its a auto.....if its a stick if a zf6 and if its a dmax in a work van then ita 4L80E cause them allison wont fit under the hump in the floor
This guy has got it.

6 speed allison's (06+) are stronger than the 5 speed allisons (01-05)

you put stock duramax power through them and you'll have a real tough time breaking one. I've owned 2 duramax's now, an 02 I sold with 100k on it and it drove like it was brand new, and my 06 has 100k on it now and pulls great even though I've had it tuned since it had 27k on it.

I've got a 500rwhp tune in my duramax that could burn the trans up really quick if I felt like it. I don't feel like spending 4-5k on a rebuild so I keep out of it over 80mph.

If you're buying used I would say take it for a test drive and mash on the pedal and let the trans lockup and see if its slipping at all. Only reason it should slip is if it was heavily abused and/or had a power adder on it.
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Old 07-19-2011, 07:18 AM
Ecoscapes Ecoscapes is offline
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Thanks for the tips, sounds like I'll stay looking for 06' an up, found one with 130000miles kind of high but I'll try her out today.
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Old 07-19-2011, 09:09 AM
anixon92 anixon92 is offline
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duramax

i have a 02' 2 wheel drive duramax with 195,000 on it without any problems. just replaced brakes and oil change and this machine runs great. i did lose my brake oil once, so i replaced all brake lines because they were rusting out. truck pulls great. i was running nj to fl. hauling furniture with 24' enclosed trailer and didn't even have any problems with it. like i said its 2 wheel drive not 4x4 and it doesn't like the ice or snow. i love it.
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