I have recently learned that there are 2 different part numbers for the axle shafts used on 3rd gens, one for the disc brake rear, and one for the drum rear.

My question is, what are different between the two?

Can the shafts out of a drum rear, work in a disc rear?

The drum rear axles are still available from GM, and the disc axles are discontinued.

I'm only concerned with the 7.5 rear, NOT the aussie 9 bolt.

Thanks, and I only really need some hard facts on this, as I have already played the guessing game with my dealership parts dept. and have gotten nowhere.

 

The disc axles have a smaller diameter flange where the wheel studs are, to fit inside the rotor. Some older drum axles won't fit in a disc rotor.

Disc axles will always work in a drum rear.

It's entirely possible that they are now all the disc brake diameter, and they simply deleted the redundant part #.

 

werent there different spline axels offered on them also??

 

90 and up were 28 spline. 88 and lower were 26 splines, 89 was a transition year and could be either.

 

thats what i was thinking thanks for the info ede

 

Right; if they still service the 26-spline axles, then there would still be 2 part #s, one for 26 and one for 28. But not one for disc and one for drum.