when you replace the universal joint
replace the torque tube bushing and seal
(oakie bushing) available at all the vendors
for about 60.00. that will probably fix it.
at low cost. but if it dont then pull the rear end and pull apart.
try u-joint and bushing first. you can do that yourself.
I see a bushing puller on e-bay cheap.Item#1806856977
you need this to pull the old bushing
If he pulls the rear and works on it will
be big money
Mike