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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Sorry, You asked about enclosed driveshafts, and my answer responded to that.
I should have been more specific: Yes, any 31xx series 1948-1954 truck 4-speed will be synchronized in up-shifts, and in down-shifts (except maybe from 2nd to 1st), AND, they should have the torque-tube cover on the rear of the transmission (easily confirmed by looking at the rear of the transmission).
The rear enclosed u-joint cover/housing on the 4-speed is swappable/changeable with an open drive-shaft cover/housing.
I do not know what improvement you are looking for: high end or low end. The high gear in both transmissions (and in the 318 3-speed) is 1:1.
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