OK. So I bought an '89 Raider with bad syncros and I am either going to rebuild it or source some kind of replacement.

While looking for info on the box, I'm seeing references to different versions of it. -1, -2, etc.

Do these boxes interchange with each other and join to the same transfer case(s)?

Are the later boxes truly improved? If so, does a rebuild (syncros, bearings, gaskets) update an older box to newer specs? Or were there major parts/big dollar changes that occurred?

Are parts at all available for them? A quick search shows that bearing should be, but syncros?

Or, if the idea of rebuilding is out of the question, what would be a suitable replacement that would take minimal refitting?

Thanks for any help you're willing to offer.

PV