`96 Cougar squeaky tranny?

Hello again everyone!

My 96 cougar was in a slow speed T-bone accident; hit on the passenger 
side behind the door and just in front of the rear wheel. The impact 
pushed the back of my car about a foot to the left. Since the accident I 
have noticed a squeak coming from somewhere in the drive train. I put 
the car up on jackstands and turned the rear wheels and driveshaft by 
hand. The driveshaft turns a lot easier in the forward direction than in 
reverse, and I hear a fairly quiet almost continuous squeak coming from 
the tranny (4R70W) when the driveshaft is turned in either direction. 
The squeak reminds me of a noisy drive belt, only a good bit quieter. 
The car has not been road driven since the accident, only moved from the 
side of the driveway into the garage.

If anyone has any insight if this is normal, or the tranny is FUBAR, or 
anything else, please let me know.

Many thanks in advance!!

Brad