The transmission in your truck is a Mopar A-230 three speed fully synchronized in all forward gears...it's a very rugged box...I have one behind an early hemi in my 1952 Ford F1 pickup....your clutch is not releasing completely...check for worn linkage bushings on the cross shaft...check for the correct amount of pedal free play....make sure all return springs are in place (under the dash)....inspect the engine mounts for wear, and the trans mount too...If everything checks out and is still serviceable, then get ready to change the entire clutch assembly...disc, pressure plate, release bearing, pilot bearing, and possibly the release bearing fork...It might be worn on the yoke fingers or bent, but you can't tell unless you take it out and examine it....Now when you put everything together, make sure not to get any grease whatsoever on the flywheel, disc, or plate.....lube with grease all linkage pivot points, adjust to factory specifications, and you will be good to go.
