Would this be the first time both the diffs and transfer case oils were changed ( that is if you know the history of the truck since new ) and if so how many miles are on the truck now. Also and of course that would make all the difference if this was the factory oil or had been changed prior, what volume of wear metal fine paste like substance were on the rear vs the front diff cover magnets.
So far I have drained the rear diff oil and the transfer case as I said above at 9000 miles but don't have a clue what would be on the front diff magnet and would be speculating to guess it surely couldn't be near as much as what the rear diff magnet had on it due to it going along for the ride a large part of the time. The transfer case I have has the 4 auto feature which I have tried to avoid using as much as possible due to warnings about the clutch pack slippage wear that takes place, certainly I saw some discoloration of the oil but it still easily identified as red fluid but the fact it has no magnet isn't impressive but I think most transfer cases over the years never had a magnetic plug.
As a l8t owner, I don't think I'd ditch my 7.3 Zilla to get one. Nothing against the 6.6,but the Zilla's issues are pretty few and far between. Yeah, early ones had cam/lifter delam issues, but from what I read, that's all been sorted.
Buying new, I'd say flip a coin, as both are solid, but doubt I'd trade my Zilla for a l8t over delamination fears.
Honestly, I don't think you can go wrong with any current HD gasser, even Ram. They have hands down the best trans, and the 6.4 Hemi doesn't have nearly as many "tic" issues as the 5.7s.
Good time to have a gas HD.
Fwiw, my 25' 6.6 with 8,000mi uses basically no oil.
The dealership told me they have no idea. They also stated that the compressor has had six different part numbers too. Seems they may have issues making one that works. The loaner truck I had worked just as bad. The first 1-2 min was pure hot air before it even attempted to start cooling. After that, it didnt react that way the rest of the day.
Happy 250th, 4th of July-
We have a 2024 gmc 2500hd sle doublecab 6.6l gas 4x4, 3540 payload, towing a 2015 Rockwood 8329 TT, 35' with tractor supply box on back.
Dry weight is 7200, but the important number you need to always use is the 9000 GVWR.
It tows it just fine, that 6.6l gas engine is a work horse, Later-
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