Modern racing stock cars have a driveshaft that is crucial in transmitting power from the engine to the track. Failure of the driveshaft means you are doomed. It is often the last part of the car that is assembled. This causes racers to forget to take great care when specifying a shaft.
To ensure reliability, the custom built driveshaft system must be inspected regularly during racing seasons. It should also be replaced on a regular basis. Failure of the driveshaft system on the track can result in a race car being wrecked and possibly injury to you, your fellow racers, and your wallet. You can find affordable custom built driveshaft via https://pstds.com/custom-driveshafts.
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Custom built driveshaft is restricted to a narrow space without cooling and is surrounded by the hottest components. The driveshaft is only a few inches from the track and is exposed to all debris, rubber chunks, and hot sparks from dragging parts. The engine's maximum rpm allows the driveshaft to rotate while the car is moving.
The fabricator makes a tunnel in the floor plan for the driveshaft when a race car chassis has been built. He has found that the tunnel should allow enough space for the shaft to move. He doesn't know which major components will be used in what combination.
Older chassis can be converted to other brands and transmissions routinely replaced. It is wishful thinking to assume that the driveshaft will always have enough clearance to function properly.