An interesting piont that many miss when changing final drive gears in your diff is, due to the change in ratio, tail shaft speeds are more excessive and generally(not always) you'll get a light hum and/or vibration(not from driveshaft). So while your getting your gears done it's worth getting your tailshaft overhauled and balanced. Also changing final drive in gearbox is not a complex job at all, it's quite basic and theres less chance of ending up with a noisy gearset.
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