If the transmission has a fixed yoke then you absolutely need a slip joint somewhere in the shaft, usually toward the front.
Model/length of truck will help determine if you need a two piece driveshaft or if the truck is short enough to use a one piece.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-