[BruceG34]

My modern tractor laid down on me last night so I got the 48 VAC out to do some disking. soft dust been worked up a while and never planted. the tractor would spin both rears at about the same speed. Pulled like you would not believe though.
I'll have to tear it down to see if this is mechanical failure or a something someone did intentionally.
I know they weld the spider gears on derby cars, I'm sure they do on pullers to. I just can't imagine the feller I bought it from pulling one.

 

[1031d]

If I'm in the sandy ground in the back I can get both to spin on mine too, differentials let the wheel with least resistance spin, and if both are footed the same it can do that.

 

[rusty6]

I think if you truly had a locked differential you would notice it very difficult if not impossible to turn corners.

 

[BruceG34]

It does not turn very well I figured it was the lack of the front wheel weights.
I'll get one side jacked up soon.

 

[ralbuck]

I had a car decades ago that would spin one wheel on slippery stuff and if you hit just a little power it got both and pulled you through! That was before limited slips were even close to common!

While we were Y & S (young and stupid/strong) we checked it many times because it was different from the others around! Came to the conclusion that it was somehow mildly torn up!

When I did tear it up and changed it out; that quirk was gone, then it became a one wheel spin like everything else.

So I added more confusion to your question.

Also how can 2 "identical units " be so different on power and fuel use etc. We have all seem this many times!