89, as far as I know a dana 30 is a dana 30. I put the Ford 8.8 (4.10's, Ford limited slip) in my 88 Ranger to replace the 7.5. Got her out of an explorer...heck, since Ford stopped making the best rear axle ever manufactured (9-inch), that 8.8 is about as close as you can get to a bulletproof rear.