Truck Transmission Help Needed

I need a good place to go to, no bull-turd type of place that knows what they are doing with DOMESTIC TRUCK transmissions. I think I might have a problem w/my truck’s transmission but I don’t know enough to nail the problem on the head so I’m going to eave this one to the pros. I don’t mind going out of GTA; not trying to be stereotypical here but I find people out in the sticks knows more about trucks than people in the city.

So yes any help would be greatly appreciated.

what kind of truck man? no it stereostypical dont worry im a country folk, theres a tranny specialist near me im tryin to remember where it is i hear its really good though and they specialize in just tht but im not sure how much it wud cost. ill try to get the name for u soon man

Thanks

1994 Chevy Suburban K2500
6.5 Turbo Diesel
4X4
4L80E w/Gear Vendors double over drive unit