When should i change the tranny fluid. i put 25k on it since the engine was rebuilt, wich was when the tranny fluid was changed.wich type should i use. also what type should i use for the rear end. pretty sure its not limited slip.

 

For the rear, you can use the same fluid that you put in your tranny if its not an LSD. Synthetics work best, such as redline oil. Alot of people here use and recommend it, in fact, I don't think that there is anyone who wouldn't recommend it if price was no object.

When you should change it? I don't know, but at 25k it certainly would not hurt.
Its a real pain to change btw, there is a pump method that works best, check the archives.