thanks for the replies everyone,
I am looking for an r200 to go into a TR6, i can get the conversion kit, but it needs to be an r200 vlsd from an NA, so i guess i have to live with a 4.08 ratio... that will give me a faster "launch`" but a higher engine speed on the motorway... i only have 4 gears.
apparently this diff in 3.45:1 ratio was used in the USA in the infinity Q45 during the 90's, as we never got them in the UK, i guess i wont find one , unless someone knows they were in another UK nissan ?
it's ironic that i joined this forum when i was looking for a TT last year and here i am looking for bits of one !