Spindle nut socket size

Im thinking 2-1/4. I got conmets on my kw and thats what mine is.

 

If they are preset, then there is NO back off. Go directly to Con-mets website, download the instructions and follow them.
http://www.conmet.com/service-2/service-literature/

 

Only reuse the spacer on a conmet hub if you reuse the bearings. NEVER reuse that bearing spacer on new bearings.

Honestly, those spacers wear over time causing it to loose clearance. I dont like reusing them. I leave them out and set bearings the old way with dial indicator or basically zero to SLIGHT preload.

 

Bearing clearance specs of .001-.006. Can you see that even though you can see the moon and how far is that?
Bearings to tight will tend to generate heat while loose bearings will tend to cause a seal failure.
Sorry I cannot answer you normal temp question but it is highly effected by the brakes and vehicle usage.
Would be more concerned about one running much higher than the others or anything over about 250 degrees.
Infrared temp guns are cool but there are other indicators.
Burnt rubber smell: May be caused by heat from a low pressure tire. A rotten or separated tire about to give up. A brake dragging transferring heat to tire.
Burnt oil smell: Could be a leaking wheel seal or a bearing problem anywhere from the hub to the driveshaft.
When running heavy and or before going into an area without services for a long time I always stop and look things over. Touch the tires and hubs while fueling or just do a pretrip in the middle of the trip.
Yes you can get odd looks from the "It blows smoke and the wheels roll pretrip guys. Wave when you go by.

 

By any chance anyone know the spindle nut socket size i need for my front steer 1996 peterbilt 379? I believe theres 2 different sizes of spindle nuts.