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Could be anything mate, if its a driveshaft it will do it at any speed or when you're turning, try doing a 3 point turn using full lock from side to side whilst the wheels are turning and listen out for any knocking/clicking noises.
A wobble could also come from worn engine mounts especially if you have it flat out and the engine is under a lot of strain it will move a lot more.
If you're stuck for parts give me a shout, got plenty.