Are you positive that your upper pins are not just tight in the casting? I am not sure about the D-60 but when I replaced the Tryon shackles in my '31 chrysler to the later rubber bushing type I had to machine a special tool to fit over the tapered pin then heat the casting then back-up the back side of the casting then hammer the H out of them to get them to move..They were tight, tight, tight...My better option may have been to heat the casting hot then let it cool completly before driving.
Where Are You From? Leavenworth, WA / Yuma, AZ
Do You own a car built by Durant? '25 Flint H-40 2door / '25 B-40 Touring / '29 D-40 Coupe / '23 A-22 Touring
Just wanted to give an update on my rear spring shackles
Yes the pins are removable I had to remove the units and bring them to a machine shop where they had to press them out guy said they were in there very tight.
thanks for all the input I now have a good set of spring shackles