Previously thought the tightest nut on a Defender was the front crankshaft pulley retaining bolt,271 Nm but have now found a new contender,the 32mm nut holding 5th gear on the layshaft of an R380 gearbox,a whopping 350Nm. I had to fabricate a tool to hold against the gear with a metre of 20mm round bar as the handle. Suffice to say, it bent before the nut eventually came off.
