Axle's

Spec out Super 40's. Light housings with heavy gears. I pulled a 9 axle klowbed with mine.

 

Someone that is a little more technically savy than me will be able to answer you about the internal differences of a 40K vs. a 46K axle, but I know the Gross Combined Weight Rating on Super 40's and 46's is anywhere from 140,000- 170,000 lbs. when compared to a regular 40K axle which will normally have a GCWR of 110,000 lbs.

 

As posted, Super 40s are fine for Super-B work.

 

They don't have to be. That was the normal spec years ago. Then it went to super 40's. Now there's a lot of people running normal rear ends. Just more likely to break with the lighter rear ends.

 

It's nice to have heavy wall 46s with a lube pump....

 

Depending on where you're running the majority of the time, you could get away with running just straight 40s with a super b behind you. Super 40s would be better and 46s would be best if you running in east of Ontario for any length of time.

I miss my super 40s with super b. Nice smooth ride vs heavy spec rears with 16-20k fronts and 5 axle behind ya

 

What are super 40's? Some kind of hybrid of 40 and 46's?

 

@Mr. Haney gives an explanation in this thread.

 

The truck Im specing out will have Dana 40-170's in it. It has the all the parts of a 46 rear end in a 40 housing.