One problem area that can be easily fixed with the transmission in the car is the low/reverse servo leakage problem - the delayed engagement in drive or reverse and the "jerk" on engagment. Here's the servo cover you need to remove:
Ok so, for those wanting to just fix the low reverse servo... it IS spring loaded, but it is not a strong spring... just be mindful there is a spring behind that cover, remove the cover bolts evenly.... and voila....
Here's the servo out of the bore. Replace the seals using a new version and your delayed engagement problem will be solved. Use vaseline lubricant (you know how to do THIS right ?) to carefully put it back in the bore.... make sure you first remove the gasket - it tends to stay on the valve body - put IT on the servo cover which goes on last after the servo body is in the bore.