The car is a i965 slant six valiant that was bought in a non running condition due to engine problems.The rearend is off the car.When trying to turn the axles,they have a few degrees play,then it turn freely for aprox 120 degrees,then it tightens up for the rest of the turn.Which should i look for? Parts suppliers?Is ther a place i can send it for repair?Its a 7.25 rearend. Thanks Jorge

Look for chipped or broken spider gears.
(pull-off the rear cover and look at the gear teeth)
In general, it is best to get a replacement used assembly. Where are you located?
DD

I an at Nashville TN. Thanks Jorge.