FWIW, I would recommend changing the two bolts to studs, sold by a variety of suppliers.
Dana 60 ARP Stud and Nut
View attachment 632857
Would be worth the $20.00 cost.
Also consider, changing the Front Shackles to ORD Heavy Duty Version and use the Greasable bolt with nut that are available.
View attachment 632858 View attachment 632859
Compare front shackles ..............Greasable bolt
Regards
I just changed mine out last month. I did use the "ORD" kit. Pretty nice kit though one of the zirk fittings blew out when I was greasing it. I also went with the studs. I loctited them into place and after the springs where all mounted I cut the studs down to the proper length.