Well there is ARB in Launceston and Hobart, North West Off-Road in Sprayton (Devenport)
For the major stuff.
But a good little secret iv just discovered is the mechanic at H&M Motors in Invermay, Launceston. Just had some serious work done there and so happy with it! Quality workmanship, trustworthy, knows 4x4's as he owns and goes 4x4ing alot! Competitive pricing too. Very recomended.