howdy all ok shudder found looks like the handbrake was the problem, well most of it, as previously posted the rear transfer output flange seal had leaked, it contaminated the brake shoes, also the handbrake cable was shot and not releasing it was pretty gunked up. the seal was actually in crooked
talk about dodgy, drives as it should now still got a bit of a rear diff clunk also replaced the lower gearbox mount as it had a few cracks and looked a bit squashed but will have the diff fixed with a rebuild and a Detroit.
once again thanks for the help cheers all