[Wardsworld]

Both hills were no problem but I did lay low on the quad to keep my center of gravity as low as possible. #90 Black is a short steep rocky climb.
Diff Lock Works!

 

[RedRocket]

Thanks for sharing!!!

 

[Vincent]

Diff lock is indeed an excellent feature to have

 

[JimP]

Diff lock is indeed an excellent feature to have

It's one of the best mods that I have done to my base model, when I installed the 501Parts kit.

While I seldom use it it is a lifesaver when I do lock it in.

 

[Wardsworld]

As said you really don't need it 95% of the time but when you are in that 5% you need it 100% ;-]
Generally I ride in two wheel drive when possible but on the really steep or really deep stuff a locker wont leave you guessing.

 

[Kingwalleye]

Diff lock for the win! The 450 handled it like a champ.
I've ridden the HMT trails and I can tell you that most videos don't show how steep the trails are.