I own a 2000 rav 4, 5 speed manual, 2WD. I want to know if there is a way to change it from a 2WD to a AWD.
Yeah, that's my point. If Toyota didn't include those mounts (which would be unused on a 2WD) they would have to be custom fabricated or cut off a 4WD and welded onto the body.You would still need the mount that the control arms run to and that the differential mounts to.
The propeller shaft is still available from Toyota for big bucks. You can get an aftermarket shaft for about half of what Toyota ask for theirs. I am in the process of installing a new propeller-shaft in my Rav4 this morning. While the Toyota manual shows how to replace the center bearing support, Toyota says the shaft, u-joints, and center support, are replaced as a single unit. My made in the USA aftermarket propeller-shaft is completely rebuild-able. They build replacement shafts for both 2 and 4 door Rav4s.You need to get a donor RAV4 because from what I understand, some of the parts like the drive shaft/propeller shaft is no longer available new. This way it would be a simple matter of taking parts off of one and moving them to the other after making sure they are in good shape. If you don't have anywhere to keep the donor, you can usually put one in a storage facility.
Check out www.copart.com to find a donor, of course it would need to be a 2 door version.