i just got a 1987 rx7 fc and i need to replace my u joints off the car, but im not sure how many it has, does it have 2 or 4?

 

2.
and they are integrated into the driveshaft,They say NOT replaceable,BUT you can take the shaft to a driveshaft shop and get them to put in a set that you can later replace if need be.

 

1) Try a shop that can rebuild it for you (since they're technically the non-replaceable variety, as misterstyx mentioned).

2) Get some more posts under your belt and hit up the classifieds for a used driveshaft. If your car is a non-turbo, you will need a non-turbo driveshaft. If with a manual transmission, the driveshaft will also need to be from a manual car.

 

There are also inexpensive driveshaft replacements made by Mazdatrix, that do have user replaceable u-joints.