Originally Posted by
tabetha
DON'T use std dexron/atf.
Use only Castrol TQ-D, about £9 Litre at Halfords etc, you'll need 2.55 Litres, you can and I have used gear oil 75W90, this will quieten things down, but will/can be be a bit of a pig to change when cold.
There were many variations of the T5 internals, even as supplied to ford for the cossie, so I'd stick with the closest stuff to the original, the TQ-D, unless you have serious wear.
tabetha
Why do you recommend not using the Ford oil? I changed the oil in mine a couple of years ago and was recommended a certain oil (can't remember what it was but it was expensive), I did this and it then started to crunch when changing from 2nd to 3rd, I then changed it again using Ford oil and it has been fine ever since.