Jeez, I'm trying to rack my (old) brain and think back to very early 1970's when I did my 1969 Ser 2a box.
It had sheared the lay gear beside the straight cut teeth which was apparently quite common. The updated (Genuine LR) lay gear had been shot peened during manufacture around the end near 1st gear teeth presumably in order to remove 'stress' in the material.
But something in my brain reminds me I had to quote Suffix number on gearbox in order to get correct matching 1st and reverse gears otherwise the straight cut teeth were mismatched and your noise would happen.
Maybe your box has been apart before and wrong reverse gear fitted?
Or am I imagining that situation??
Definitely was the case with Morris/Austin Mini's gearbox's of early/middle 60's period (I did scores of 'em!) so maybe am getting confused!!
PS: Just called my mate who had LR's with me at same period. Yes, he agrees, common problem with mismatched gears, we think the problem was with reverse gear and definitely necessary to quote Suffix number. The photo of your lay gear looks like it is an early type that was not shot peened so you should replace that for sure.
Before: Ser 2a LWB, Ser 3 S/W, 1979 RR 2 door, 1981 LR Stage 1 V8 (new), 1985 LR 110 V8 County (new), 2009 RRS TDV8
Now: MY13 D4 TDV6. "E" rear diff. Cambo's magic Engine & Auto Tune.
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