Oh I am hardly an expert. Just trying to tell what I know about it and what I've seen. There is plenty that I dont know about it.
@jekquistk5 do tell why ? and lift specs ? what problems ?There are a few types of the sd shaft. You want the spicer series. Got one dune season so far on my 40 buck cut down sd shaft. I’ll be having Tom woods make me a clearanced one for this year.
so looking over the ebay link you provided @iwaxmyjimmy the pics show what looks like a smaller center pilot hole than what jesse / rugby_7 said is the 3 1/8" pilot size needed .
do you have any more info on this ? the length looks perfect for what we need and prob no length change . just trying to make sure .
maybe @obijuank5 has some info also ?
Send it. I put 50k easy on my sd shaft with 6" and a 400/205. Still wheeling it now. Got it from @muddybuddy like a decade ago.
1350 for all three joints. Good choice all around imo. If you go custom 1350 CV it's just going to be a superduty cv head anyways.
Dodge now has a 1410 shaft that's pretty sweet I just got my hands on.
https://www.dennysdriveshaft.com/p1098_chevy__gmc_4x4_1350_series_double_cardan_cv_flange_yoke.html
This is the other link I posted that is the part number to make it fit your factory flange.

For the sake of info...
‘06 Dodge 2500 srw 4wd CTD 6spd
Front driveshaft:
The pilot hole has a step, 2.5 & 3.1
The CV is just shy of 4” across the ears of the flange piece. - 1350??
View attachment 296142
Had to clearance it a bit at full droop. Nothing major.@jekquistk5 do tell why ? and lift specs ? what problems ?


The joints on the two I got all worked free and easy. I had planned to replace all the joints before i purchased them. The ones I got both had around 150,000 miles on them. They are rusty for setting out in the weather, but not like I seen from your area. 

