My 01.5 is approximately 60 1/2" inside the endplates, measured around the rear cover.

 

I was speaking of the one you bought.

 

Napa's website has the best information about individual parts. After looking up the brake rotors, I found that 2500 and 3500 have the same brake rotors, so one cannot judge on that alone.

Also, that looks like a D70 to me, not a D80. The D80 seems noticeably deeper from pinion flange to cover, but I recognize them best from behind. A 3500 will always have a D80.

I think you're okay.

 

Thanks SixSlug, thanks Hodge and lgp9999. I think I'm good to go too.

 

Sweet...I love it when a plan comes together so nicely.....mwhhhoooohhaa haaa haaaaaaaaaaaa!