97 Stratus, stuck in 2nd, engine light came on

so i was on the highway for a couple hours then when i came off, a couple stop lights later i noticed the car wasn't shifting from second gear and keeping the rpm at around 4k rpm going about 40mph. Next stop light i was idling and all of a sudden the heat temp gauge shot to hot, the temp light came on and the check engine light came on. I immediately shut it down to avoid warping the engine. Stated up fine a minute later and haven't had a problem since.

i went to autozone and the codes that came up were the following:

P0700
BBTransaxle control system fault
Explanation
BBECM received a signal that the transaxle control BBmodule has a fault
Probable cause
BB1.- Shorted or open circuit within transaxle
BB2.- Failure of transaxle control module

P1776
BBSolenoid switch valve latched in LR position
Explanation
BBThe TCM has detected that the LR pressure is high
Probable Cause
BB1.- Check other service codes first
BB2.- Shifter cable out of adjustment
BB3.- Open or short circuit condition
BB4.- Internal transmission fault

The transmission is kind of foreign to my car ability so can someone put this in lamens terms for me? Do these codes coming in a pair narrow it down at all? Thanks.

did the speedo work? it may be an output senor on the trans

yeah, the speedometer worked

Is it still stuck in 2nd? If so had the same thing happen, had to get a new tranny.

I would suspect it might possibly be the input and output shaft sensors.