Ok, so I know it isnt a bonneville, but I have a relatively generic ? that someone might know the answer to. So on my truck, i has a 4L60E transmission (4 speed Auto, 4x4) anywho... when its cold, shifting into reverse is fine, but if its warm, it Jerks HARD, and today when I was putting it in reverse, it made this AWFUL grinding noise that didnt stop till I put it in park, and then back into reverse, it kicked, but no grind.. Now, going forward is just fine, smooth upshifts and smooth down shifts, Transmission fluid is a perfect color, and level... and seeing as its a used car, no warranty .. I think i just got hosed, but let me know if it might be something simple.
EDIT: Just realized this may need to be in the lounge.. if the mods would be so kind if appropriate.