Transmission code?

[MtnDewd]

I'm trying to find replace my O2 Sensors on my 99 Hoe and i was asked what transmission code my hoe has...4L60-E or 4L80-E. How can I verify which tranny I have?
Many thanks...

 

[96ProCompTahoe]

you have the 4L60E unless someone has put the 3/4 ton trans in it, which is doubtful.

 

[haks310]

60E

Would be nice if you had the 80E though lol

 

[MtnDewd]

Thanks guys, I appreciate it!