7.5 Question

[Oldchevy61]

Just got the 7.5 10 bolt cleaned for paint and am a little confused as to what I have. Now I have not had the cover off of it, and it is sitting on jackstands. If I turn the axle by hand the other side turns the opposite direction like open carrier, Although the yoke does not turn. If I turn the yoke, both axles turn the same direction.. Why does the yoke not turn when the axle is turned by hand yet axles turn when yoke is turned ? And why do the turn the same with the yoke and opposite by hand?

 

[GPNX]

Rear end is open differential.

 

[UNGN]

Just got the 7.5 10 bolt cleaned for paint and am a little confused as to what I have. Now I have not had the cover off of it, and it is sitting on jackstands. If I turn the axle by hand the other side turns the opposite direction like open carrier, Although the yoke does not turn. If I turn the yoke, both axles turn the same direction.. Why does the yoke not turn when the axle is turned by hand yet axles turn when yoke is turned ? And why do the turn the same with the yoke and opposite by hand?

There is a preload on the pinion bearing that makes it slightly harder to turn than the gears in the open differential. The axle bearing don't have this built in resistance.

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