Transmission rebuild question

well the trans was too messed up to rebuild so i had to purchase a rebuilt one...the place i'm geting it from specializes in racing transmissions so hopefully its decent....i just thought it might be safer to replace the driveshaft at the same time
 
You should be all right but I would buy some U joints also

I think thats what I'm going to do with mine I know it doesnt have to many miles left I'm gonna ride that old girl till she blows its a good excuse to buy a new one although I might put a cooler and shift kit in it and run a filter in the cooler line to see if it will give me a couple more miles to save up for the new tranny