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Have a 3116 cat with a 6 speed standard. truck didnt come with a manual and i cant identify what model of transmission it is. I found the vin decoder book from GMC but there is nothing in the vin that says transmission type only engine.

a regular hydraulic brake truck. GVW is 23500 pounds.

does anyone know what kind of oil this transmission would take? and what model it is?

thanks.
 

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Im almost positive they put a zf6 in those trucks. Ive seen guys run transynd, dex3, and even 10w30 synthetic engine oil in them before which apparently quieted down gear noise quite a bit.
 
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