Vcode said

The driveshaft is a trunnion type and is original to the car. What was done is the 7-1/4 Rear End was changed to a 8-3/4 complete.
What is the best way to measure the driveshaft to see if it is the correct length now. I am not familiar with the trunnion driveshafts.
It is different than just center to center on the u -joint type that I know about.
Thanks Bob

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The question you need to ask is what is the difference in axle centerline to yoke center line distance between 71/4 and 8 3/4 rear ends. That will be the exact amount to shorten the driveshaft.

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