Hey Jerry, I just overhauled 2 identical transmissions just like yours. It costs about $200 for the parts and a lot of work to get it in and out of the car. Your description of the delay and shuddering in reverse is exactly how mine failed. The tranny shops want you to believe it is difficult and expensive. But in fact it is really very simple if you know the tricks. I would be very happy to help you if I can assist some how.
One of the options I investigated before I decided to rebuild my own was a MB rebuilt unit from the dealer. They can be had from MB for about $1700. Then whatever it takes to put it in. Two year warrenty.
I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k