can i use my drive shaft from my 4 speed on my 5 speed tranny

If its the Nissan 5 speed, the drive shaft should fit. If its the BW T5 from a turbo car it wont. More info can be found with a search.

Good Luck

I did that conversion yesterday and my '71 driveshaft with the '79 5-speed worked perfectly. I had other mods to worry about because of the year of my car, but it runs like a dream now.