Make/Model/Year information might get you a better answer. Axle codes from
the vehicle's identification plates would help even more. Depebding on the
vehicle/axle type, you might be able to jack the vehicle up and try turning
one wheel while someone else holds the other. Or just floor it on muddy
ground. If you sling mud from both rear wheels, you probably have a limited
Flooring it on a muddy road does not always tell you either. I have a blazer
that I bought new with locking differential and it no longer locks up. The
dealer told me you have to change the differential fluid every 20000 miles
for it to work properly, what crock of bull! You never used to have to do
that years ago, I guess this is another GM engineering marvel.
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