>Now, I'm under the impression that the front axle on a 4wd is supposed to turn slightly faster than the rear axle, so I'm guessing I need a 3.9x rear one. I'm not 100% on that, though, I just know that engaging 4wd with a 3.92 front axle and a 3.5 rear is going to cause bad juju.
To the best of my knowledge they should move at the same speeds though, when you turn with 4wd the outside wheel will move faster and the inside slower which causes the wheel bind you notice on a surface with good grip like pavement.
>Oh, and the heater doesn't work. I'm not sure why, but it puts out not-hot air, and I can't even get that to blow in the windscreen-only mode. I'm not really sure why it won't switch heater modes, or why it won't switch on, but I haven't had a chance to start troubleshooting yet. I suspect a plugged heater core to begin with, but the switching of ducts is probably part of the vacuum system or something.
Yeah, check the controls, ducts, etc. along those lines. Pretty much every vehicle I've seen after about 10 years starts to have some kind whole or partial failure related to the system that forces the air. My Expedition fans only seem to work on high, but the heat and a/c work so I'm in no hurry to fix it.
Yes, sir. I'd double check the year to confirm, but I think all of them were built on the F-150 frame, also they're nearly identical to the Lincoln Navigator. The Durango, sadly, was built on the Dakota chassis. Most post 90s vehicles will have at least 1 fully or nearly identical other named vehicle. With the engine and transmission usually being used in several other vehicles by the parent company.
To add to that, nearly every SUV is built on a truck or car chassis. So it's always important to check if your SUV is a fancy truck or a fancy station wagon hatchback thingy.
Have some off road Durango
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