Cosworth T5 rear seal replacement , best seal
 

Hello,

my T5 gearbox is leaking quite bad from the rear seal and I am looking to change it out over the next few weeks.

Can anyone tell me the best seal to buy and we're from? I've changed it once before, but didn't stop the leaking, has anyone got any extra installation tips ?

The leak might be due to improper removal of previous seal by the use of a flat screwdriver and a hammer. I've seen many with this kind of damage. One thing you can try is to to fill in the "gap" with some black RTV silicon when fitting the new seal.