If you are jacking up the engine in the truck, use a block of wood under the crank pulley.

 

Oil pan works if you can spread the load out a bit.

I'm a fan of the area where the trans and engine meets.

 

The oil pan is very strong...but it's cast aluminum.
Keep applying weight and pressure to it, see how much it takes to crack or break it...and have the jack punch through, crush the pickup tube, and the engine fall back on to the mounts.
And hope your hands/arms aren't in the way when it does.

 

I used a small section of 2x6 to spread the load on the oil pan, I just did my motor mounts last week. Worked just fine.

 

It does...until it doesn't.
I don't trust the weight on a casting.

 

That's fair.

 

It's a Land Rover...I trust nothing on it, lol

 

Wife got me a new t-case shift **** for my birthday! Looks so much better than the rubbery D1 I had on there before. I think she got it from rovers north

 

Cool story bro.

 

Not a story, I have personally seen it, not on a D2, but on a gm smallblock. Metal pan buckled under the weight and crushed the pan and pickup.
Fortunately no one's hands were in the way.
Yes, the D2 pan IS heavy duty...but cast aluminum is known to be brittle. It has very little give before it cracks.
Especially if there is a flaw, trash or air trapped in the material, then you have an unseen weak spot.
Do as you will, but jacking on an oil pan is not smart.
Jacking on the crank pulley is much safer, can support Alot more weight than a pan, Alot more, and usually is an easier spot to get the jack under.