Don't know what the ping was, sometimes springs catch up and release, making a sound. Was the noise inside or out? No synchro on reverse so the clutch needs to be completely released to get a smooth engagement. Foot to the floor. You could try putting it into 1st or 2nd before trying reverse but it sounds more likely that the clearance at the slave needs adjustment. The book says 3-4mm, release the spring when checking. 2mm is usually fine, there must be a little bit of clearance to stop the release bearing from touching the diaphragm spring all of the time. If the pedal itself has a lot of free/loose play, that can be adjusted too. Play often caused by the hole for the clevis pin wearing oval. If this is so, replace it. This adjustment also takes care of the pedal pad position, which should be level with the brake pad.
Being an 1800, the lever needs to be lifted to clear the reverse lockout plate on the top of the lever ball socket. Lift the boot and check. The plate might be loose or need a small adjustment.
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