truck not moving while in gear

Don't have a clue.
But I hope your a company driver.
Big repair bill.

 

Keep us posted on what it actually was. If truck seemed fine when you stopped, could be pinion, be odd if snapped axle without feeling it but not impossible. Usually this type of breakdown is a larger one, gonna come out with a decent bill and a repair story.

 

He didn’t come back to this thread you wanna know why?

Because one of his drives was off the ground. Someone pointed it out he locked his diff and got out of the mess he was in.

I say that from personal experience and I’ve seen it happen usually at a slanted dock driveway. Now it’s funny but at that time I was hearing a noise too but the truck wasn’t moving.... because the tires were hanging up

Edit: he couldn’t have snapped an axle after he had parked maybe if he was stuck at some point and ended up bouncing the truck that happens. Usually when we off road to our off road rigs

 

That's helpful.

 

My understanding from when I took my 4th year HD was a lot of differentials are damaged when bumping docks. That shock of the sudden stop coupled with low gear, low RPM torque and 34,000+ lbs of weight pushing down on the drives can easily tear ring and pinion teeth in a higher mileage differential.

 

Had a o/o three weeks ago snap an axle in the parking lot. He was empty, slight incline, but issue was ice in parking lot. Shank his foot into it at wrong time empty stepdeck no weird angle or anything just hooked up at wrong time and twisted. Good driver, been around a long time but it happens. Differential was locked it due to snow and ice. Probably would have been better off with a little weight on drives.

 

shock loading is what breaks rear end parts they rarely go out under steady load without warning. spin or jump a tire can snap parts like glass.

 

That is true but many things in the drive train can crack from a shock load. Then the cracked area continues to work and crack. When the amount of material left is not enough to carry the load it snaps off.
Often the driver gets blamed for what a previous driver did.
The color of the material in the crack changes with age and gives some history. Maybe some one else can share some failure/analysis pictures.