How can i tell if the my tranny is a gsr or ls other than by looking at the sticker bar code? i jus swapped out my motor n noticed that the tranny code was a gsr(y80) but the motor is ls... someone told me that if i'm going 80 n the rpm is at 4k then it's a gsr but if it's at 3.5k then its a ls, is dis correct or wrong. can someone shed some light on dis it would help me out a lot... any 1 w/ any info feel free

 

Try the tech forum, you may get more help there.