I don't know about a different thread.
I'd say heavily use the SR rules and overlay them into the old setting.
If you're running an adventure for the most part you can chug the NPCs though
http://www.shadowrunrpg.com/resources/sr4/.../sr3_to_sr4.pdfFor hackers/deckers I would simply treat deckers as hackers who have to use wired or sat uplink interfaces, but otherwise use the same rules. Your call where you want to set prices, but those million nuyen decks would probably have responses of like 10 or 12. (Note that doesn't mean they're better than modern tech, just that they're better relative to tech of that era). Also in that time tracking and black IC type programs aren't in the hands of the common decker.
As for other things all the bioware is gone, but so are watcher spirits and initiation, so it kinda balances out.
For cyberware you could go by when the sourcebook came out but a lot of tech was probably availible before that, they just didn't think of/print everything that could exist. Also the SR4 base book doesn't have a lot of the more advanced cyberware/nanoware making your job easier.
I think I'd:
-remove vision enchancements (the kind that give pluses to perception)
-make artificial low light etc one worse than natural
-no ocular drone
-no or reduced vision mag (until about 2050)
-no blance aug/spatial recognizer
-no bone lacing (requires nanotech)
-no reaction enhancers (requires supercontuctor, note wired is still fine)
-no cybertorso/cyber skull
-no cyberarm gyromount
Most of the basebook vehicles and drones have been around for a long time, and could have been produced earlier. Just get rid of the micro/mini drones and change some names.
Ditto with firearms, just change the names a few increments and remove the included smartlinks
remove
-fubuki
-ares alpha
-super squirt
-the pain inducer
-!!!!! remove stick and shock