Go back to the wrecker to see if you can contact the last owner. Sometimes there are old papers in the glove compartment or trunk that identify them.
Usually the past owner will be honest in his opinion as he has no longer any vested interest. If he states the transmission was fault free take him at his word. Same if he tells you it had a grind or other noise.
If you decide to shotgun the bearings in the transmission regardless see if the price puts you off first. Changing all the seals might be wise as if the transmission lost enugh oil it might be damaged before you noticed it sometime in the future. Seals are usually cheap in comparison with the other parts.
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