I have a 1977 280z, with 5-speed transmission.

Do I have a FS5W71A or a FS5W71B? I am getting mixed research results.

According to an official Nissan Service manual for a 1977 280z, it says I have a FS5W71B.

According to an eBay listing (and other online shops) for a 1977 280z transmission rebuild kit, it's listed for FS5W71A.

Basically, I need a transmission rebuild kit, but can only find ones for FS5W71A, I'm having a hard time finding one for FS5W71B.

I think that the B came after A (of course) and was available as an option in 77 and on. Just what little I've gleaned since getting my car.

The company linked below really seems to know their stuff and show a rebuild kit for 77-83, which would be the B 5-speed. He'll respond if you send an e-mail and probably if you call. The rebuild kit price doesn't look bad either.

http://www.datsunstore.com/index.php/cPath/27/sort/2a/page/4