Hello brothers, new to the board

just bought my 1st envoy denali 07.
Now winter hit hard 2day here and im not familiar with the denali 4x4 system and what would be best to choose for SNOW and ICED ROADS....
I turnd it into 4HI and im just in lOVE with this thing already, damn smooth and hugs the road.
but heres my Q.
On these Snow packd and Icey Roads i will lock in 4HI
But would I want my TRACTION CONTROL OFF. or would i want TRACTION CONTROL ON???
What would be best driving results for Snow And Icey roads
Also would you recommend gettn my tires CYPED? (mispelld)? Please answer's all question if possiable
