1/2 ton driveshaft to 4 speed trans
 

I have a 1/2 ton '48ish torque tube style driveshaft/axle that I am putting a 4 speed manual trans of the same vintage in. The enclosed u-joint from the trans is larger(heavier spline) than the 1/2 ton u-joint. What is the best/easiest way to make the connection. I will send pix when available...any ideas?