Driveshaft length tolerances +/-?

SGBARRACUDA said

I’ve never seen this subject beat so damn hard. I think my mentor taught me back in 1969 to start with a yoke, leave “ of play at the trans and build the dimension that is left. Hell you think it’s tough now, you to to build a shaft with a trunnion joint.

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I apologize if this thread is beating a dead horse. I always try to do research and search here before asking questions, but I couldn't quite find what I was looking for. I was hoping to be able to find a driveshaft that would work without having a shop build one or cut one down because it seemed like a simpler process and could likely save money. So, I found the dimension for my car with the combo I'll have, and was wondering if there was a tolerance to that particular dimension, but it looks like the consensus is that I should measure anyway.