okay i have a 91 rex si and when i first got it, it started making a weird sound in first gear. its not like a grinding and its not when i shift. its when im in the gear. now every day but not all the time, second and third have started with this and its getting pretty loud sometimes. i know its not the motor for sure. it might be a bearing or just cause of the cold?

i need some good advice whether i should expect my tranny to go out soon or if its something minor and cheap to take care of.

thanks.

any NOT assholish advice is appreciated.