So I'm working on a '57 Chevy, it's got a newer Turbo 350 (1980ish) in it with the original rearend. I found a driveshaft that is almost the perfect length, maybe just a bit short. You can see from the slip yoke on the unknown driveshaft that it originally had about 1" exposed and the other 2 1/2" inside the tail of the transmission, the barrel is 3 1/2" long total. When I put this shaft into my car, I get about an 1 3/4" exposed, almost 2" I'm not experienced at all on drivelines, so I have two questions. 1. Can I assume that I should not run this with only 1 1/2" to 1 3/4" of yoke barrel in the tranny tailshaft? It's clearly not ideal. 2. Can I remedy the situation with a slightly longer yoke? I see the aftermarket offers a yoke that has a 5" long barrel length, which would give me about 3" in the tailshaft and 2" exposed, maybe 3 1/4 in/ 1 3/4" out depending. Would it hurt the car at all to have the U joint an extra inch away from the tailshaft? or is 3 1/4" too much to have in the tailshaft? This is a relatively low horsepower car with stock leaf springs/suspension travel. Here's a pic of the current yoke which you can see the witness mark on from whatever car it originally came from, and a pic of it installed in the car with a tape measure for scale. The car is standing on it's suspension with all of it's weight on the wheels, minus the seats, doors, side glass, and a driver, so I suppose it could compress a bit more once those things are added back in.