Recently purchased a 07 Chevy Express 3500 with 6.6 Duramax. It was rough shifting, checked and fluid was low. Took it for tranny service, receipt shows info from old vehicle. Need to know how much tranny fluid is needed for this vehicle, and what kind.
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07 Chev 6.6L Duramax
- Thread starter Judy
- Start date
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- Tags
- fluids transmission
- Staff
- #2
I think the vans had a 4L80 transmission. Dex 3 would be a guess but IDK what quantity
Did find what kind of fluid - Dexron VI, but still don't know how much....
JayTheCPA
Well-Known Member
Welcome to TTS! 
According to Amsoil's database it likely has the 4L80E/85E which takes 13.5 quarts. If for some reason it has the 4L60E, it takes 11.2 quarts. My vote is that it has the 80/85E.
For absolute confidence, consider pulling the owner's manual from GM: https://my.chevrolet.com/home
Registration with GM is free and only need the VIN to get the manual.
According to Amsoil's database it likely has the 4L80E/85E which takes 13.5 quarts. If for some reason it has the 4L60E, it takes 11.2 quarts. My vote is that it has the 80/85E.
For absolute confidence, consider pulling the owner's manual from GM: https://my.chevrolet.com/home
Registration with GM is free and only need the VIN to get the manual.
Ed HD
Formerly: Dad's 05 LLY
The "full fill" is 13.5 quarts, but that includes the torque converter, cooler and lines, etc. You only actually drain about 8 quarts when you drop the pan and replace the filter. Get 2 gallons and 1 extra quart and you should be fine. Dexron VI (6) is the proper fill for a 2007 4L80E.
- Staff
- #6
It has a 4L85E, the strongest 4 speed auto GM ever put in a light duty pickup. Pretty sure it has a deep pan in that one. A typical drain and refill with new filter I would expect to be in the 8 quart vicinity, but how long you let it sit with the pan off and filter out can change that. If you let it sit for a long time with the pan off and filter out, they can drain back fluid out of the pump and torque converter. DEX VI was factory fill at that time, but not my personal choice for a good ATF.