2000 Chevy Silverado 1500 4.8 transmission issues? Please help

[Norcalajchevysilverado]

Basically, I've been driving my truck through heavy rain all day, no issues, went through a drive through, getting back on the road my truck wasn't going over 2000 rpms and wasn't shifting. Pulled into AutoZone to check fluids thinking they were low, they were fine. Then I tried reving it up in park and nuetral and truck still wouldn't go over 2000 rpms.. put in in reverse to leave, but when I hit the gas, nothing happened as if I was still in park, drove truck home and was almost home when my trans fluid hot light came on.. I am baffled... Please help im thinking it could be throttle body sensor or possibly trans fluid filter.. or a number of things idk.. it has a monster transmission with only about 70,000 miles

 

[Norcalajchevysilverado]

Chevy Silverado 1500 transmission issues

 

[zora]

The engine not going past 2k doesn't really sound like a slipping transmission. Was the engine temperature higher than normal? Do you have a scan tool to check for codes?