Did you break a axle shaft OR did you break the Dana 30 Axle housing itself? IF you broke a shaft only then it doesn't matter what gearing you have as any shaft you get from a Dana 30 that is non Vacuum Disconnect will fit, the down side is that your Dana 30 has CV joints instead of U-Joints because you have a V8 and it is all wheel drive, if you go offroading alot then upgrading to u-joints will be better but if you drive mainly on the street then you can get a new shaft with a CV-joint from a parts store for like $75 bucks. You will have either 3:55 gears or 3.73 gears in the axles depending on if your truck has the towing package (i.e... towing hitch and associated wiring for towing and a transmission cooler in front of your radiator), I know that you have a Dana 44A (aluminum housing, with axle shafts held in with C-clips) because you have a 98 and it is also a V-8. The best way to see what gearing you have is to look at the axle cover and there should be a rectangular "tag" with a whole bunch of numbers on it attached to the cover with 2 of the mounting bolts. IF within the series of numbers you see 355 then you have 3:55 gearing, IF you see 373 then you have 3:73 gearing. Post a pic of the tag if you have trouble reading it. Hope this helps.

Fred R.