This synchronizer ring (Baulk Ring) was used in the First and Second slider as well as the Third and Fourth Slider. With the MGB gear box being so robust one forgets that once in a while the gear box will need freshening up. If you get a small gear crash sound under hard acceleration from first to second its most likely warm synchro's . Stop double clutching your MGB put a set of synchro Rings in your MGB, it will be good for another 100,000 miles. Double Bonus, these units are Made in the UK for a perfect fit and function.
