Quote:
Originally Posted by sandford6016
Thanks, it's definately not the mat, I checked that first! Synchro ring, ok, can I be stupid and ask what that is please?
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It aligns the gear clusters to enable meshing, when its worn, the teeth don't mesh inline and bounce off each other, this is the graunching noise you hear.
BMW fill their manual boxes with piss oil nowdays due to finer manufacturing tolerances, The old hypoid gear oils used to make cold boxes a bastard, but nowdays, a graunching box is an early indication of trouble, only imo of course, could be totally wrong, but the weakest part of the gear clusters is the synchro rings, so first to go. Notice the brass rings, this is not a BMW box, just for illustration.
