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4wd I presume? The output seal might depend on the spline count. Local NAPA looked it up last time I needed one.
Rockauto.com shows for an 89 under auto-transmission->seal:
SKF Part # 14730 for 2wd $4.66
ATP Part # RO40 {Transfer Case Adapter #83504055} $6.75
That 83504055 number looks like a Chryco number.
For a 2000
SKF Part # 14730 for 2wd
SKF Part # 19622 for 4wd
I have these seals sitting in my spares pile now -
front input seal - Federal Mogul / Motor City S223830; MOPAR 8350 3752
rear output seal (4wd tailhousing, the 2wd is different!) - MOPAR 8350 4055
I like the Crown input seal more than the Federal Mogul one, it seems to be better made. Metal pressfit ring instead of plastic and the seal lip itself is slant-ribbed opposing rotation to squeegee the fluid back toward the transmission instead of being smooth. I tried another brand of input seal as well (forget which) and it was also ribbed.