It was designed that way. It is not really meant to be replaced until you get into Northrend at level 68. It is one of the "perks" of the Death Knight class. Just vendor the gear that you get from quest rewards or drops for some extra cash. You will need it for training and flying.
I would help to be a tad more specific in your question. Regardless- Death Knights start ourt with gear way overpower for their level. By the time you're done with the Death Knight starting chain you've got even better gear. This should be good till around level 65. Though it is quite possible you've gotten some better gear while leveling up. I suggest doing instances to level up. It's not incredibly hard and plus you get good gear. If you're talking about getting good gear when you're 80.. well than. You should do some random Heroics until you get sufficiant gear for raiding. It should be pretty obvious after that. ICC gear is the bomb- for all classes.
A Hard Day's Knight - 2008 is rated/received certificates of: UK:U
Knight Rider - 2008 A Hard Day's Knight 1-4 is rated/received certificates of: Australia:M USA:TV-14 USA:TV-PG
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1 ring means an memeory problem replace the Hard Drive
When playing Metal Gear Solid 2 on Hard you must defeat 12 Metal Gear Rays.
truck start shift is hard to move in gear
Knightwatch - 1988 Hard Day's Knight 1-5 was released on: USA: 15 December 1988
The shift cable has failed.
Easy to replace. Hard to get to.
Phineas and Ferb - 2007 A Hard Day's Knight 1-28 is rated/received certificates of: Australia:G
2004 citreon relay gear selection is very hard 1st and reverse very hard