Mate ive had a problem like tha with me old box the diff was dead noisie the noise wud go wen the clutch was at the very bottom so i put another box in and all was good no diff noise at all. But on the way ome from college i had the simler problems to u! my clutch bite was at the very bottom so i adjusted it, theres adjustment bolt on the peddle 12mm spanner i think try tha before takin the bow out. Hope this helps you in some way lad