Why do you have open diffs?
I’ve had both open diffs and locked axles. Currently my 1st Gen tundra is open/open- many other vehicles are too. Why does it matter what I have though…?
If you have a locked axle, isn’t it a no brainer to put chains on your locked axle? A locked axle and chains would be a cheat code. No point in putting them opposite sides, opposite corners when by putting them on the locked axle you guarantee that you always have traction to at least one chained tire.
Now, if you have locked front and rear axles (rare in factory form for most vehicles), I suppose I might look at putting them opposite corners. But it’s still impossible to gauruntee that you always have one chained tire with traction (you may get flexed out).
But, I think I’d lean towards putting them on the axle that had more weight on them. Empty truck bed, put them on the front under the engine. Overloaded rear? Put them on the back axle.
There is also an argument to consider that front tires get the chains first since they presumably get the to the nastiest terrain first.
Also, Lokka (an Australian manufacturer of auto locking differential mechanisms) has some interesting insight on why they recommend locking the front axle first. Part of the advantage, as they see it, is helping the vehicle maintain traction when going uphill. It may apply to tire chains. Read it and let me know what you think.
The guidance is Q10 on Lokka’s FAQ page.
I cannot yet post “links” to that FAQ, needs mod approval when I post links, otherwise I would.