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There is not set length. You'll just have to get under the car and measure. There is a diagram on Dennys drivesaft website that tells you what you need to measure.
measure from the front of the driveshaft yoke to the tailshaft seal. this is the "a" dimension. measure the amount the output shaft sticks out of the trans. this is the "b" dimension. we can give you a measurement from there.