Yep. Sounds like CV joints. You can buy new front half shafts on Amazon and eBay as well as plenty other suppliers like JC Whitney and the likes. I just searched on eBay and Amazon and you can get shafts from between $45 & $100 each. I would do the seals while I was in there.
Here are a couple of pics from my 91 Chilton's manual. I'd be surprised if there were any material differences between the 91 and 89 front drivelines.