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Old 06-08-2022, 11:40 AM   #1
Join Date: Feb 2022
Posts: 33
2002 Chev Transmission - what do I have?

Recent owner of a 4 window Chev school bus with the Duramax 6.5 engine. My question is about the transmission. Is it an Allison or??? I've had three oil change guys look at the transmission and all have said there is NO spin on filter. Wonder what I might have? Any thoughts?


Don in E Texas is offline   Reply With Quote
Old 06-08-2022, 12:18 PM   #2
Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,845
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
most of ther Van chassis GM busses got 4L80E transmissions
cadillackid is offline   Reply With Quote
Old 06-08-2022, 12:37 PM   #3
Bus Nut
Join Date: Oct 2018
Location: Central Alabama
Posts: 544
Year: 1998
Coachwork: Blue Bird
Chassis: TC/2000
Engine: 5.9 Cummins 12-valve
Rated Cap: 1
My 02 MicroBirds didn't have the RPO codes located in the bus, but I was able to call the local Chevy parts dept and they gave me info of the trans, rear end ratio etc. using the VIN.
BamaBus is offline   Reply With Quote
Old 06-08-2022, 01:55 PM   #4
Bus Nut
Join Date: Aug 2020
Location: Alabama
Posts: 295
Year: 1996
Coachwork: BlueBird
Chassis: International 3800
Engine: DT 466 Mech. Spicer 5 speed
Rated Cap: 34
I asked a service techniican, and he said it was probably a 4L80. The six speed 6L90 came out in 2006 or 2007. We are pretty sure all Allison's have a spin on filter. My thinking is that the Alllison would physically not fit in the van chassis.
PorchDog is offline   Reply With Quote

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