53 Block
dmistal,
Sorry to hear about the cracked block, but glad to hear they are going to replace it for you.
My 99, 53 block cracked in exactly the same place you described. Dodge installed a new 56 Block with NO hassles. I had 63,500 miles on the truck at the time of the failure (Now have 85k), and everything has been fine. Cost to me was $0. 00.
One thing the dealer did tell me, was the Cummins engine warranty (5yrs or 100k miles) is not extended with the new block. At the time of replacement, I had 63. 5k miles on my truck, and was about 3 1/2 years into my warranty, so the new block only had 36. 5k mile, 1 1/2 yr warranty, which was the balance of the original warranty. Since you are at the end of your warranty, you will probably not have any warranty on the replacement block, other than maybe 30 days, to cover their work. Might be something to talk with them about.
Good Luck!
Frank Dz