Every other gear works except reverse.Transmission going out?

I have the same exact problem with my 95 GMC jimmy Automatic 2WD V6 4.3 VORTEC, won't go into reverse at all and when driving it seems to skip shifts (or gears), and I still haven't taken it into a shop yet but I went online with a mechanic that "claims" to specialize in GMC Transmissions and he told me it sounded as if it was the torque converter or torque converter solenoid. I will let ya know tomorrow once I find out exactly what is wrong with mine. I've got a tow truck scheduled to pick it up around 2pm today to take it to get a Automatic transmission Diagnosis, to let me know if I can afford to fix it or junk it!

it could be a 4l60 trans or a 700r4 used ones run about 500 with 400 in abor to replace or 1500 to rebuild