Broken front diff from gearing down

Does driveshaft spin and truck not move that is bad diff. May have to ck back box on trans?

 

Tandem drive? What locks are you engaging: Diff or interaxle?

Normally when something lets go in a diff you'll have no drive with all the lockers disengaged. If one of the countershafts in the aux section went out you'd hear gear noise but would still have drive from the other countershaft.

With that much stuff crunched up it'd be pretty easy to pinpoint what failed. Just check the diff and transmission magnetic plugs for shrapnel.

 

Did you drain it? Check the fluid for metal shavings.

Sounds like your auxiliry box, if the noise was on a specific gear I would say drop the whole transmission but your auxiliary handles the High and Low Range and the Drive and Overdrive gears, which was what you moved when the transmission failed.

Start by draining the oil and take it from there. Eaton website has al the info for free if you need a diagram to understand some things.

 

Stick a magnet to the bottom through the fill plug opening. What do you find? That is on both diffs.

 

Sorry forgot the 1st thing you must ck is a U-Joint going bad, have to ck them before you go taking everything else apart, a bad u/joint can make all kinds of racket before it flys apart

 

If your truck makes a CLAC CLAC CLAC CLAC CLAC CLAC at 2 mph when you try to go anywhere it's probably really deep inside your rear or rears.

We used to call that sound the click of death. Trucks have been cheaper to junk than fix with that kind of damage.

 

Or slip yoke in the driveshaft between the trans and front diff. Should have one on the last shaft hooked to the front diff.