I am selling the trans I pulled out of my 2005 sierra. I always thought it was a 65-e. Some guy who is interested asks for the 4 letter code on top of the trans. it is 5chd. he says this is a 60-e. I looked at this code online for many transmissions that are 65's and 60's and the code is different for most and no code is the same for just 60's. i checked the code fro three different 60's and all were different. How do I figure out what I have? Thanks.

 

Look for a RPO code M32. That would mean that it is a 65.

 

Thanks Vince.