There's a scenario with the Detroit locker that I cannot figure.  Let's say I'm pulling a truck with trailer combo that grosses 8 ton.  I'm on a marginal traction surface...slick grass, snow, whatever..  I'm in low gear because I'm in a driveway, field, etc and both rear tires are working to keep me moving.  Now I need to make a 45 degree or more turn.  How does the outside tire increase speed so it can unlock?  And if it can unlock, how to I keep moving? 

Remember, this is with a 2wd F250...I believe that's what the OP has.

Appreciate your explanation cleandan.  The one draw back I see for the detroit locker is that it's either locked or unlocked (i.e. open).  I'm guessing/assuming the locker is open during all turns.  I can understand that is fine/preferred for a lot of folks, though I wouldn't want that for the way I use them. 

In the barn yard or pasture field towing/hauling I like to have both tires pulling including while turning.  In a rare case where one tire tends to free spin with a truetrac I can temper that with the parking brake. 

My only comparison is the manual lock on 2wd tractors.  They're either locked or unlocked.  Locked is good on a long, straight pull but it has to be unlocked for turns.  Navigating turns I'll bias the differential by feathering the right or left brake as needed. 

I can see the locker and truetrac as being meant for different situations.

Not trying to sell truetracs but am curious why would one choose a detroit locker/grizzly locker over a truetrac.  I think of the lockers as more for dedicated offroad/rock climbing.

You'll never know a truetrac is there (no noise, no weird tire wear, no unlock scenarios), it will last longer than most trucks, and in the odd chance one tire has zero traction you can make your tire that has traction spin by feathering the parking brake...I've done that. 

Sometimes those ebrock carbs need their floats adjusted.

When folks talk about buying domestic vs overseas, thoughts understandably turn to jobs, supporting the family, etc.

We're in a position where much of the equipment and knowledge for important industries no longer exist in the US or are in the process of leaving....gone to a country that doesn't like us.   

US goods produced in China is a complex situation.  A while back I worked with someone who was forced out of his job in car parts sales.  Chinese companies could produce and deliver quality parts here at a price lower than his US company could buy the raw steel to make the parts.  I believe their lack of safety and environmental regulations along with cheaper labor had a lot to do with that.  Kind of ironic given how we are so concerned with global warming.  We highly regulate ourselves and end up sending manufacturing to where there's much less regulation... not sure how that reduces global warming. 

Many US design companies have employees overseas to coordinate manufacture of US designed goods because there is no (or very little) ability in many categories in the US anymore.  And that includes way more than auto parts...fabric, chemicals, pharmaceuticals, etc.

Not to mention, the Chinese government supports and sponsors corporate espionage...says our own FBI.  And there's very little US manufacturers can do about that.   

I'm sure many of you know all of this.  And it's not a rant or a political statement.  That's just the way it is and I don't see that changing without a LOT of tough choices being made by everyone. 

Impact of these part substitutions was interesting.  You can do a search on Junky Junk and follow the iterations.  You have just a few more cubes than Junky Junk so might have to adjust some things for that.

https://fepower.net/simplemachinesforum/index.php?topic=8113.msg89348#msg89348

Few month's ago another fellow had a similar problem.  Jay had a nice diy type fix if you have an old rocker assembly lying around.

https://fepower.net/simplemachinesforum/index.php?topic=12720.msg136806#msg136806