I'm converting my car from a auto to a 4speed manual and I'm looking for a driveline and all I can find is 50 or 51 so my question is there any difference in a auto driveline or manual driveline any help will help thank u guys

 

Driveline? Do you perhaps mean driveshaft? If that is the case, I do believe there is a difference. If you only need the driveshaft shortened, a reputable auto repair shop should be able to shorten and balance the shaft for a reasonable price. If you need a longer shaft, you will obviously need to locate a new one. Hope this helps!