I've seen about seven or eight high mileage Hemis (+150,000 miles) and their owners seem to have had little to no problems with them. Suspension components and electrical issues are the two things that stand out the most. Older Rams (3rd gen) appear to have had issues with the Power Distribution Module with taillight symptoms being somewhat common. One fellow told me the end seals were leaking on his rack, but he also was the one with just over 300K miles. I think four of them said the blend door broke on theirs.
As far as I can tell Hemis don't use oil and the 545RFE transmissions are exceptionally sturdy. None of the guys I've talked to had and tranny problems. A few said they replaced U-joints. One guy said his rear differential failed after 160K or so.
Haven't heard much of anything about 4th gen. Did have the coast down ticking problem on my 2010, but that appears to very rare as my dealer has only had one...me! The only component I replaced on my 2010 after 104,000 miles was a rear taillight assembly because water was getting into it.
2014 Ram Big Horn 1500 Quad Cab 2WD, 5.7 Hemi, 8HP70, 3.92 LSD, factory dual exhaust, 20” wheels. Now at: 005200 miles.
Last edited by Dusty48; 08-05-2014 at 06:03 PM.