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I'm assuming that this is a 5 speed stick car because you mentioned 80-90 oil. This car has a transaxle, not a a separate transmission and differential. The transaxle houses the transmission gears and the differential all in one housing. There is a drain plug on the bottom a fill plug on the side. Here's a link to one of the best do-it-yourself 944 sites on the web. Click on the "garage shop manual" link in the sidebar and scroll down to "transaxle fluid change".
Timing belts on 944s NEED to be changed every 30k miles. It can be a challenging job. I would recommend a shop. Balance belts, rollers and usually a water pump replacement is recommended at the same time. Cost, approximately $1400. Parts can be purchased cheap, but labor is 8-9 hrs. If you decide to do it yourself you will need a specific timing belt tensioner gauge tool. Good luck