2004 Saturn Ion 2 - front axle nut torque spec

I just replaced the front hubs on my 2004 Ion 2.
There doesn't seem to be a consensus on the torque spec for the axle-to-hub nut...

I have a factory paper manual that states the nut should be torqued to 110 N·m / 81 lb-ft.
There is an online version of the manual that says the spec is "100 N·m (74 lb ft) plus 35°".
Other sources online state that the nut should be tightened to 155 lb-ft.
Some sources indicate the spec differs depending on the model year, which is odd since the hub is the same part number for the entire Ion production. For example, partsgeek says that it's 81 for 2003 & 2004 and 155 for 2005-2007.
https://www.partsgeek.com/8cxgshv-saturn-ion-wheel-hub-assembly.html

What's going on here???
Was there a TSB about this, and if so, does anyone know what the most up-to-date spec is?
One thought is that perhaps the spec was updated from 81 to 155, which I would assume would be made retroactive for earlier model years, but perhaps not all resources were updated.

Anyone have conclusive knowledge on this?

 

Thanks for looking into it. What's your source? So I take it that means all years should get torqued to 155 lb-ft if the hubs are replaced?

 

I've done some more looking into this...

All model years of Saturn Ion from 2003-2007, all variants, and all transmission types use the same part numbers for the front hub, axle nut, and outer CV joint. Therefore, it reasons that the torque spec SHOULD be the same for all vehicles.

I called my local Chevrolet dealership to see if they knew of a bulletin from GM regarding a revision of the torque spec. They found no such bulletin, and their system also showed different torque specs for different model years. For my 2004, their system said the spec was 81 lb-ft. For a 2007, they guy said it is 74 lb-ft and NO ANGLE afterwards, so that's a new one for the growing list!

I called MOOG who made the replacement hubs I used (part number 513205) and asked their tech support if the axle nut torque affected bearing preload on this particular hub. The answer is NO. Bearing preload is independent of axle nut torque on this design.

These hubs use what Moog calls a "roll form design". Half of the inner race is integrated with the wheel flange casting and the other half is a ring that slides into place after the outer race and balls are in place. The ring and everything else is made captive when the inner end of the wheel flange casting is flared outward in a press which also sets the bearing preload.


I'm just going to stick with 81 lb-ft, which is what I initially went with. I'm not positive that's the "best" value, but I have no reason to be any more confident in any of the other values either. I can periodically check the nuts to make sure they're not loosening up over time. The most important thing is that I know I'm not going to wreck the bearings due to a preload issue.