Been having issues lately with my dad's transmission in his 92 c1500. It has been shifting hard out of first and second gear and the truck revs till about 2500-3000 rpms before attempting to shift. We changed the fluid and filter. Fluid smelt burnt. Im wondering if the tranny is gone or maybe just the torque converter. Any thoughts? I know nothing about the 700r4. I have the nv3500 so im lost. Checked the throttle shift cable and it seemed to be fine.