front driveshafts

Will the front DS from an 89 work in my 98? Are they the same length?

No, but the one from a 91 was. The 89 was about 2 inches shorter.

You talking to yourself? The answer to your question is complicated as it depends on what engine, tranmission, and axle was installed. The guide you want to look at is http://www2.dana.com/pdf/J321-CV.PDF. If you're looking to cross to another vehicle, you just need to match the '1310 series' in the description which identifies the u-joints at either end.

Now that is a handy PDF file!