I'm looking into buying a early or late 90's turbo diesel truck for work purposes and hoping i could get a little advice on what diesel trucks have proven there reliablity any info/advice would be appreciated greatly

Buy a Dodge Ram with a Cumins Diesel. The most reliable would be the 5-speed, although the Automatic is good and can be made excellent with aftermarket parts. The truck may eventually fall apart but the engine will still be running (opposite experience with Ford, truck OK, engine falls apart [cavitation errosion a big problem, total loss of engine]).

That's the ticket...go Dodge Cummins.