After cleaning and washing the cardan shafts, check the cardan joints of the shafts for ease and smoothness of turning the forks and for the absence of significant axial and radial clearances.
Check the balance of the cardan shafts on a balancing stand as indicated below.
If the turning of the forks is smooth, there are no jams, the imbalance of the drive axle drive shafts does not exceed 1.716 N·mm (175 gf mm), and the intermediate shaft 2.16 N·mm (200 gf mm) and through the seals of the bearings of the crosses and the protective cover of the intermediate shaft, grease is not thrown out, then disassembly of the cardan shafts is not recommended.