Rear driveline in the front?

[us74k5]

Is it okay to use a rear driveline for the front, if it fits?

 

[lectric80]

If it fits there shouldn't be any issues. Older Furd Highboys had driveshafts that were matched length front and back so you could interchange in a hurry. Shouldn't be any issues, the driveline doesn't really care which way it turns.

 

[Blue85]

Only a slip-yoke type wouldn't work. As long as it fits and there is a slip-spline in the shaft, you are good to go.