What is the difference in the 3 channel axles and the 4 channel axles?

Are they interchangable? I have some 4 channel axles and I have a 3 channel rear end will they work? I don't see the difference. Different part numbers.

 

The 4 channel axles are machined for the reluctor rings to fit on, that is the only difference. Bob

 

Will they fit in my 3 channel? or will they not

 

I've never tried it but I don't see why they would not work. Bob

 

And you shouldn't have to worry about your ABS because your speed sensor is in the pumpkin, everything should still work fine. 4 channel speed sensors are on the ends of the axles but your 3 channel rear won't know the difference.