This studder; does it do this upon initially putting the car in reverse, with eventual, solid engagement, or is the shudder constant?
If you DO have the 722.02 transmission (with the square, four-bolt oil pan), you should know that reverse is the first to go in these transmissions. The reverse servo band piston has a rubber lip seal that dries out and begins to break up. This usually manifests itself as delayed engagement into reverse, which can be made faster by revving up the engine, and, eventually, no reverse.
The servo piston can be serviced without removing the transmission. There is an external band adjustment that can be tried first, but, it usually doesn't help....
Mark in Lakewood, CO 
If you DO have the 722.02 transmission (with the square, four-bolt oil pan), you should know that reverse is the first to go in these transmissions. The reverse servo band piston has a rubber lip seal that dries out and begins to break up. This usually manifests itself as delayed engagement into reverse, which can be made faster by revving up the engine, and, eventually, no reverse.
The servo piston can be serviced without removing the transmission. There is an external band adjustment that can be tried first, but, it usually doesn't help....
Mark in Lakewood, CO
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