i have a 86 300zx in need of new u joints but i heard that this u joints are integrated with the driveshaft and u have to replace the whole thing. Is there anything i can do with the old driveshaft to fix this problem? thanks

 

What makes you think you need new ujoints in the first place? Also a majority of driveline shops can replace the "non replaceable" ujoints. You could to if you have the tools.

 

Also, hate to be that dick but this is the Z32 forum, you're asking about your Z31