[Mr mk2]

hey all just did a manual conversion on my mk2 cortina everything is sweet except the rear gearbox seal is leaking, i very well could of damaged it putting it in but the other thing is I used my automatic tailshaft, i do have a manual tailshaft but the mounting yolk on the rear of the manual tailshaft dosent match my diff mounting holes, i have a english axle and the manual tailshaft is suited for the borgwarner axle, i tryed swapping the rear yolks but the uni joints are bigger on the manual then the auto so i just wacked in the auto one, i know its 20mm or so shorter then the manual tailshaft, could this be why its leaking and will the auto tailshaft handle the manual box? cheers