Well you can just about hold your hand on it, it's not noisy at all, don't have access to a infra-red thermometer, I may take it out and put 3.89 back, see how hot it gets. Thanks for the reply. Myles.
Hi thanks for accepting me, my name is Myles, I have a mk1 cortina super,which I have fitted a 3.54 diff in. The diff gets quite hot after normal driving, any thoughts on this.