Hi guys,
A couple of months back i blew my turbo on my fiesta TDCI and after going through 4-5 turbo units since then I gave up on trying to discover the problem and bought a used engine. In the process of swapping the engine over, my friend recommended that i replace the oil seals on the gearbox, what seals are these? are there one for either side of the drive-shaft entries also are there any others?

Another question I have is all I can find for gearbox oil seals online are for st150 models, Im assuming i have an Ib5 gearbox based on what I have read up (sorry but im not too sure what an 'IB5' gearbox is i'm pretty sure its a hydraulic system? I may be wrong) so is there a difference between the petrol mk6 st150 gearbox and the mk6 zetec S 1.6 TDCI model?
Thanks guys
Ryan