Transfer box oil leak


Any ideas as to where my oil leak may be coming from on 92 Fourtrak TDX Unknw
There is a lot of oil spread around the area on the transfer box where the propshaft to the rear axle joins. It has started recently when I towed a Nissan Terrano up a hill !
There is a tiny drip now and again visible on the ground...

oil leak

hi i got 97 ind 4track u need differential oil seal about 3 pounds to buy somebody to fit it only small job an around 3 litres of transmition fluid

M Billingham