Faith Fellowship
USA
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How can I determine if my 2005 Chevy gas 2500 HD has an Allison transmission and if it's a four or five speed? Is there a code for this info on the sticker in the glove box? Appreciate, in advance, your help - thank you.
Pastor Bill
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Thud
MS
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Joined: 04/10/2007
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Faith Fellowship wrote:Is there a code for this info on the sticker in the glove box?
Yes.
MT1 = 4L80-E 4-spd
M74 = Allison 5-spd
MW7 = Allison 6-spd
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FiverDragger
MI
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Your transmission is not an Allison. Allisons are only put in Diesel 2500 Hds. Yours is a 4 speed 4L80E I believe. There is a code in the Vin number that the dealer can tell you what trans is in the truck.
Ron
2002 Chevy 2500HD 6.0 4.10 axle ext cab longbox
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CND SuperCrew
SK, Canada
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FiverDragger wrote:Your transmission is not an Allison. Allisons are only put in Diesel 2500 Hds. Yours is a 4 speed 4L80E I believe. There is a code in the Vin number that the dealer can tell you what trans is in the truck.
Ron
Unless he has a 8.1 then I believe an Alli was used
Ron Lori and Autumn
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Thud
MS
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FiverDragger wrote:Your transmission is not an Allison. Allisons are only put in Diesel 2500 Hds. Yours is a 4 speed 4L80E I believe.
Incorrect. The 8.1 Gas engine also had the Allison option.
FiverDragger wrote:There is a code in the Vin number that the dealer can tell you what trans is in the truck.
Ron
Incorrect again. There is nothing in the VIN that tells you the transmission.
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BobsYourUncle
Surrey, BC Canada
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Get a dealer to run the VIN. That can tell you everything your truck came with.
2007 GMC 3500 dually ext. cab 4X4 LBZ
Duramax / Allison
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Faith Fellowship
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Thank you for all the comments, I'll check into those code #'s and also run the VIN thru the local Chevy dealer.
Pastor Bill
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RCMAN46
NorthWest
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If you look at the transmission the Allison is obvious. It is 1/2 again as big as the others. It also has an external filter that is usually red located about center at the rear of the transmission. I am almost sure the only gas engine that had the Allison was the 8.1
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NC Hauler
Asheville NC
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My 01' 8.1 had the Allison. Don't believe the 6.0 Gasser ever came with the Allison, just the 8.1.
Jim & Kathy
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Charlie Q
Brusly, Louisiana
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The 8.1 has an Allison and on the transmission on the drivers side will have a spin on external filter that can be red, white or black depending on the filter supplier.
If you have the allison and you change the filter, make sure that you don't throw away the magnet. Clean it and reuse it.
'03 Chevy CC/SB,D/A,4X4, Airlift Bags, Bilsteins, Reese slider, Hypertech programmer.
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