This is caused by wear to the shims located on the sun and planet gears within the differential. MGC, MGC-GT ; YEARS 1967-1969. MGB, MGB-GT 1.8 (TUBE REAR AXLE) ; YEARS 1965-1980. DIFFERENTIAL CASING GASKET (BTB674) x 1.
MGB, MGBGT, MGB GT V8 Bonnet Release Cable, MG part; AHH6426B
MG MGB MGBGT V8 left hand Stub axle with new king pin
MG MGB MGBGT V8 Stub axles with new king pins pair LH & RH
MG MGB MGBGT V8 right hand Stub axle with new king pin
CLUTCH Slave Cylinder PUSH ROD ASSY for MGB MGBGT V8 3.5 litre 1973-76