G80 locking differential question

07Lbz_

LBZZZZ
May 17, 2014
2
0
0
Alabama
Hi all
I have read up about the g80 locking diff in our trucks, and I have seen where it is supposed to to unlock at speeds above ~20 mph. If that is so then why can I hit the skinny pedal at speeds much higher than 20 on a dirt road and look back and see two rooster tails/ spin marks that I left on the ground? Just curious, I do not have any problems with my rear end not coming unlocked when turning etc. just curious? Thanks!:)