I was changing my oil cooler lines yesterday and took a look at my turbo and noticed it was a GM-3 turbo. Now I heard 98 and up should have the GM-8 Turbo? is this true? I have never known much about the turbos and about 8 months ago my turbo went an BD Diesel replaced it. I saw some treads that the GM-3 were for earlier models, so do i have the wrong turbo on the truck?