buying an SVX

Getting close to buying my first SVX - done plenty of reading about them and know that the auto box is the weak link in the car. Have seen that most seem to have had major work done on the gearboxes at around the 60k mile point - what experience have people had of the gearboxes lasting for at least as long after the work was done? Some of the cars I have looked at have additional oil coolers + filters fitted - would it be realistic to expect the box to last for a least another 6ok miles after this work or is it wishful thinking?

Anything else I should be looking at mechanically before buying the car - I believe rear bearings are a weakness as well?