Tranny fluid in Allison 1000
 

Hi All, I'm new here. I got two silverados so I guess this is a good forum for me to join. Anyway I am changing tranny fluid again. I cant remember what I put in it last time.[Synthetic or nonsynthetic] The guy at napa says to put dextron 6 full synthetic. He says that is original Fluid that was in there. Truck is 02 2500HD with Allison. Thankyou.
Don