I was wondering if they exist for an 1989 2.8L and if there is a large difference? I know it weighs a bit less and rotational mass is something like 10:1 so I figure it could be a worthy investment. I'm looking to make my car a bit faster (not a race car by any means). I can do the labor myself too.

 

Only time a v6 got an alum shaft was if the orginal owner complained of vibration.

The v8 alumn driveshaft only weights 1lb less then the smaller diameter v6 shaft. Cheapest I can find a v8alum shaft for is 150. Not worth it to me.

 

Any idea how many aluminum V6 driveshafts are out there?

 

It would be the same as the v8 alumn shaft. As I said, they only got installed when someone would bring the car in complaining of vibration. No v6 came from the factory with an alumn shaft.