94 5.2L ram 1500

After a week of just sitting (holidays) I drove the truck and noticed that it slips out of gears, after a couple of miles the truck slipped out of gear and wouldn't go into any of them at all. I checked the trans fluid, it was just a tad low. My truck will now go into gear farely well, although I haven't driven it except to re-park it. It makes a sorta whining noise when it is in gear. Any thoughts? It is an automatic.

I checked the diagnostics and code 37 came up which is a torque converter clutch solenoid CKT or transmission temperature sensor too high or low. I don't know too much about dodges and any help would be appreciated.