fairly new to posting lol I have a late (1999) t reg discovery 1 NOT a td5 and I cant select diff lock but I can get high and low range I have removed the centre console and the rubber gaiter to expose the top of the transfer box/linkage and can see levers operating high/low range am I right in assuming that the pin passing through the middle of the splined collar is the pin that operates the diff lock if so this has had most of Staffordshire's supply of penetrating fluid applied to it over the last couple of days and still wont budge now thinking about applying some gentle pressure with a very big hammer 
or is there a possibility that this model doesn't in fact have diff lock any advice would be tremendously welcomed
or is there a possibility that this model doesn't in fact have diff lock any advice would be tremendously welcomed
