When its full its full ,just stick some Dexron 111 in the gear box and a decent 75/140 or 80/140 in the diff . You can use the diff oil in both GKN and BTR .
Edited by SILICONEKIDOBHP on Wednesday 23 July 21:00
It`s not like doing an engine oil change ,it just dribbles out the same hole you are putting the oil in ..I don`t understand why you need to exactly know the amount of oil needed .