I just bought a passenger drop np214 out of 90 blazer and I need to rebuild it. Its been sitting out for a long time so I assume it needs a rebuild. I got it for an ls swap so i could use a 4l60e. My question is how hard is it to rebuild? I've never rebuilt one and I'm not sure how difficult it would be. Would I just be better off getting it professionally done or is it easy enough to do yourself? Thanks guys