jb4xx

Car is completely stock, 1993 LT1 w/auto Trans, 65k miles. Car had been sitting in extreme cold for 3-5 days, temps warmed up to 40 so I took it out last Saturday. Drove it ten miles and it shifted fine, on the drive back a couple hours later, no overdrive for first 7 miles. Pulled over, put in park, shifted back into drive and drove last two miles home but now it only would go into second gear, and shifted at around 4k. If you let off at 4k, motor drops down to idle instantly- Not like normal where it would engine brake and slow the car down.

Tried shifting manually and got same results.

Fluid looks good and is not burnt smell- proper level. I tried driving about a half mile a couple times since- one time it wouldnt leave first, the other it shifted into second at around 4k.

I've read a lot about TV cable adjustments. It seems adjusted right. Anything else I can check??