You can get the gearbox and diff oil and Molyslip as a kit from from Clarks.
Did mine as had same problem with 1st to 2nd, now perfect.
So PM Clark and get the correct fluids.
An update on the Goodwood Members Meeting on the 29th / 30th March. Great Event.
http://www.goodwood.co.uk/members-meeting/news-and-coverage/articles/most-diverse-variety-of-machinery-ever-assembled.aspx?utm_medium=email&utm_source=The+Goodwood+Estate+Company+Ltd&utm_campaign=3784707_72nd+Members%27+Meeting+-+Loyal%2FNon+Loyal+Database+-+7+March+14&utm_content=header&dm_i=1QLU%2C294AR%2CAS387U%2C85WP8%2C1