Not any more, 4.3.3 won't be signed by Apple now so you'll need to either restore to 4.3.4 and run legit or go tethered until an untether is released, if it is...because from what I've just read the Dev Team doesn't seem to arsed about it seeing as 5.0 will probably go Gold shortly or possibly even 4.3.5 in the mean time.
As long as you back up you shouldn't lose your settings, you will however have to re-download all your JB apps; unless you have a backup/restore app (I can recommend PKGBackup. It's not cheap but it's an awesome bit of kit).