I'm removing the front drive shaft
Are 'yellow metal ramps' safe to use on H3?

 

Those ramps will support but to be certain you need jack stands for your plan.

Those would work for a oil change.

 

The nice thing about H3s is you do not need ramps or stands to get under them and remove a drive shaft.

Look for the weight rating stamped on or on a sticker on your ramps before you use them. Ramps for a compact car are not designed for the weight of a FS Truck.

 

Similar ones just held up my H2 for transfer case repair, Still always chock the wheels and add jack stands. H3 no problem...

 

When removing the drive shaft or front prop shaft, use the emergency brake & BE SURE TO CHALK THE TIRES (as sam said).
THE H3 will roll without either shaft!!!!! NO PARKING SPAWL!

 

#1 rule of thumb after lifting a vehicle, test the lift. Grab a fender or bumper, shake/rock/jump on it. If it's still elevated, safe to go under.

 

I'm not sure what the color of the ramp has to do with it, my service lift is red, pretty sure it would still work if I painted blue,
Floor Jack and Jack stands of you have any doubts,

 

Just be damn careful under that H3.
The H3 does not have a true park. It has opposing front/back drive shafts or something like that. I damn near got crushed because it took off on me while I was below it. That is something I was blessed to live through (safely I might add) and vowed to always use extra safe guards from then forward. I wont go near the H3 without multiple wheel blocks and safety brake engaged and redundant safety measures.
Just be safe.
And those metal ramps are crap. I've got several and then tend to flex, buckle and bend easily. I now have composite extra heavy duty ones.

 

yep jack stands all four corners, much harder to roll away if its not on its wheels