Driveshaft length tolerances +/-?

jos51700 said

So my Dart has SS springs (two righties), and it's sky-high in the back. I want to de-arch them about 1.5-2".

You reckon I'll need to recut the shaft?

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No.
You are not changing the position of the rear end, or altering it's range of motion substantially.
That is of course taking for granted that it is the right length to begin with.........