Looking for a sure fire way to test the Centre & rear diffs before I buy any replacements. I know ones fried..
I alos know I can buy both from some helpful people on here and can get it fitted for about £160....

Step by step dummy way would be best.
Cars up on the ramps, handbrake off, 4 wheels floating about... Now what?

 

No such thing as a 'fool' proof way to test them at all....

What symptoms do you have determine what tests you do and how to interpret the results.....

Simon