assembled/overall rotational torque spec for 8.8

[jcodestang]

I have a 2011 with the factory 3.73 rear gear ratio in it. Over time the rear end has developed a howl at 60+mph and on deceleration after letting off the gas.

I'm pretty sure that the pinion bearing is loose, I know that the spec for a used pinion bearing preload is 8-14 in lbs. Does anyone have a spec for a fully assembled rear end? I have taken off the driveshaft and rear brakes.
When I put a torque wrench on the pinion nut and rotate everything the break away torque is 16-18 in lbs

I am trying to avoid taking out the gears if I don't have to.

Thanks

 

[mach828]

You can't measure it with the carrier still in the rear end. Those specs are driven off a pinion gear in an open housing.

Just torque the pinion nut down a little, and I mean a little, and see if it helps.

 

[jcodestang]

I got an over all spec from a BlueOval tech of 40-45 in lbs for new bearings. He suggested adding 10in lbs to the over all rotational torque because my backlash felt good. That would give me an overall of 25-30 for the used bearings.


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[rcm90]

Why don't you take the diff cover off and do an actual inspection instead of taking a wild stab at it? The gears can wear from deflection after time, run low on fluid, etc.