No, the FS5C71-A should fit OK in place of an FS4W71-A, if that is what you have in your car. Shifter position should be OK in the trans tunnel and console, and the crossmember should work.

Only thing you will have to address ( depending on your car ) is the type of propshaft you need. It will depend on diff position ( early 'forward' or late 'rearward' ) and whether anyone has changed it in the past.

The correct - early - propshaft for the FS5C71-A can be quite hard to find. Has the guy who sold you the transmission not got one..?

Okay, is it possible to find the gearbox code, from underneath the car? Than I can have a look. My car is date 5/71 stamped into it, north us market, this would make it a series II according to eurodat's post above? Nils his 240Z is a euro market, not sure about his build date, have to ask.

Did you ever find a 5 Speed 71A gearbox for your car? I recently bought 1 here in Australia and noticed that Zshop in Melbourne had 1 listed for sale on Gumtree.com.au for a while.

The seller is here:

http://www.gumtree.com.au/s-ad/glen-iris/cars-vans-utes/1989-nissan-skyline-sedan/1100528634

But the listing for the gearbox is gone, it might just have expired but it came with the flange type driveshaft also and was listed at $700 AUD.

Their website is here: http://www.zshop.net.au/

These are getting hard to find, but there is still a few around in Australia. You could also get 1 out of a Roadster but it requires changing over the bell and extension housing to suit an S30Z.