MmMmM 904 questions.

Well craigslist came threw for me once again. I found a 904 tranny that was rebuilt about 13 years ago for $300 bucks it was completely overhauld. Here are the specs.
1. Over haul kit
2. Wide ratio planet
3. 5 Clutch high drum
4. 2nd gear band
5. Turbo action valve body
6. Deep aluminum tranny pan
7. Mopar apply arm

Im not to to tranny savvy my dad can rebuild them he does all of ours. But im not sure what exactly A wide ratio planet is? Also do you think I got a pretty good deal?