Originally Posted by DustinT
Well, you'd certainly immediately lose the warranty on the differential and if you had to change the transfer case you'd lose the warranty on that as well. Then, we have to start to talk about how this change would impact the transmission and the control systems for the engine, transmission and transfer case. Realistically speaking, maybe swapping the differential won't make a bit of difference but there's no way to know until you try it. That's an expensive gamble. ANY dealership that wanted to could easily use this as an excuse to not repair pretty much anything in the drivetrain they felt like.
There's no way I'd jeopardize a 100,000 mile powertrain warranty on a $30-$40k truck for this. I bet the OP would be better off to sell his truck and just go buy a new one now that he's learned what he really needs. There's much less risk in this approach and in the long term, I can tell you which one I'd put my trust in.
Are you even reading the posts to see some of the options available? One of the options I stated was to find someone who has 3.92 gears, which would have come stock in their truck, and swap differentials with them. All the parts in the truck would be 100% OEM and I'd bet the dealer wouldn't even know that anything was changed.
Swapping to lower gears is easier on the transmission and transfer case. The engine wouldn't know the difference, so again we're all on the positive side of things here. And again, the ECU wouldn't even know the gears had been swapped since it reads the speed off the carrier (with either OEM or aftermarket gears).
No way to know without doing it? Are you serious?
Do you think the OP is the first guy to bring this up? That no one else has already done this? People have been swapping gears in vehicles for years! If you did your research and actually knew something about gear swaps rather than just arguing about warranty maybe you'd have something useful to say.
As far as your last paragraph goes. Tell me how it makes sense to sell a brand new truck and easily lose a few grand on it to go buy a new one with the gears you wanted when you could swap the gears for cheaper and realistically have absolutely no problems with it? If the gears are swapped and setup right I pretty much guarantee that there will no issues whatsoever. To any part of the truck...
If a mod like this isn't your cup of tea, that's fine. But you don't need to come in to a thread and post up an arrogant post like you did and bash the OP's idea.
PS: Don't look at my build thread. You might have a heart attack if you see the warranty I've thrown out the window