Where do I find out exactly what transmission my 2000 GMC Sierra 2500 6.0L V8...

[Dylan G]

...Have? 4L60-E or 4L80-E? Where do I find out exactly what transmission my 2000 GMC Sierra 2500 6.0L V8 Have? 4L60-E or 4L80-E?

 

[knuckleheaf27]

try this web page....

http://www.milleniumtransmissions.com/index.php

 

[epiphaknee]

Look at your RPO codes. A 4L60E is designated M30 and a 4L80 is designated MT1. Typically RPO codes are located in your glove box, but if not, call any dealer with the last eight digits of your VIN and they can tell you which transmission you have.