I'm pulling my 502 for rebuild this weekend. Can anyone tell me if I need to replace the gimbal bearing and all the bellows and shift cable? And If I find all is still in good shape, Do I still replace with new parts? I will replace the seals, just not sure if it's necessary to replace everything else. Drive was removed last year and new gimbal bearing and bellows were installed at that time. It's a 1994 Checkmate 283 Convincor with the 502efi and Bravo1.