I've sat in or checked out just about every truck-based SUV, including the new Expedition. Don't expect IRS to be like a miracle pill and suddenly make an unworkable 3rd row perfectly usable and comfortable. A lot more to it than that, but that's not stopping a lot of manufacturers from using this as a marketing ploy because "in theory" it might give you more space even if it doesn't in practice, and from trying to make people think that anything with a live rear axle "donkey cart suspension" surely must have a totally unacceptable ride and an inferior amount of space. In reality, anybody who really needs to put people in the 3rd row of any of these "standard length" truck-based SUVs regularly aren't, because they're all a joke. They buy a car-based SUV like a Mercedes GLS or Buick Enclave, or just get a Suburban/YukonXL/Escalade ESV, Expedition Max, or a minivan. I went to check out the Ford Expedition MAX at the car shows the other year expecting to be overwhelmed by how much more space it had than the Suburban, only to realize the opposite. Dunno where all the space went, but there's nowhere near enough cargo space, and the seating really didn't feel all that much roomier despite IRS and what Ford "claimed" about their specs. Meanwhile, nobody has any complaints about our new Suburban in any row, it has plenty of cargo space for all of our gear, and the ride is still acceptable despite the donkey cart live axle rear suspension and 22" wheels. That said, I would welcome an IRS setup on the GM SUVs, mainly for the lower "potential" load floor and "possibly" being able to swallow a bit bulkier cargo through the rear hatch along with making things easier to load, but hope they don't break anything else while doing it. IRS for the sake of IRS just so you can say you have it while not actually making good on any of those marketing promises while "potentially" going backwards elsewhere isn't my flavor of engineering. Guess we'll find out.
Threw it from 2HI to AUTO after driving around this afternoon with the entire driveline nice and warm, and there was hardly any additional noise. Didn't sound much if any different than 2HI. My commute is 1 mile, and I bought the truck the first week of Nov 2018 when the weather was still warmer and didn't seem to do this, so this might be some sort of screwy cold weather & cold driveline transient noise issue that goes away once the driveline is warmed up, which doesn't happen much for me lately. I don't think there's anything wrong, but will definitely mention it when I bring it in.
Yeah I’ll definitely mention it to the dealership when I take it in for service. There’s probably some truck-to-truck and ear-to-ear variability, but I didn’t seem to notice any noise while in AUTO when it was new, so will definitely mention it when I bring it in. Yeah, I’m wondering if the front differential fluid levels are low? Have never noticed any leaks on the ground. Thanks for the feedback.
Okay good it's not just me - not too worried then. Thanks. This was helpful on the GMC website: https://www.gmc.com/gmc-life/how-to/when-to-use-four-wheel-drive It does drive more smoothly and feels less mechanically busy in 2HI also. I think I feel the same added vibrations and possibly gear whining also, which would make sense since you're sitting very close to the front differential. I had been switching it to AUTO when it's been raining for a bit of extra confidence pulling out onto roadways, but don't like the extra noise and vibration, so will probably just leave it in 2HI except if it's snowing. Sounds like this is normal and just the nature of a truck-based 4WD system that can be but isn't really intended to be used all the time.
Umm, yeah... that. Drove the 10R80 in the Ford Expedition Max I rented, and wasn't too impressed. I don't understand the point if it doesn't have a wider spread of ratios than other 6-9 speed transmissions and actually skip-shifts most of the time. Once in awhile it would shift sequentially and rapidly, and jerk you in your seat a bit each time while doing it. It was annoying, but it didn't do anything stupid like the GM 8-speeds are known for doing. I'm much more comfortable with a 'fully baked' and born and bred in house and proven GM Hydramatic. Might have to look into this Black Bear tune though.
The ZF9HP for FWD/transverse applications is widely known to be a clunker, which is bizarre because their ZH6HP and 8HP transmissions for longitudinal/RWD applications are widely considered world standards. The current 8HP/RWD in BMWs and many other vehicles continues to be a gem, and incredibly reliable. It's truly rare to ever hear of one failing. That said, I agree with you. Automatics transmissions with more than 6 gears tend to be hit or miss.
Anybody else get a very brief howl-like sound while accelerating through 25-30 mph with the transfer case set to AUTO mode? Doesn't happen all the time Only seems to occur while under light to moderate acceleration and is NOT a steady howling noise. More apparent when it does it if the engine is in 3rd gear, since the engine is quieter and not masking anything Doesn't happen all the time. Lower RPM intake resonance of the 5.3L around 1800rpm in 3rd combined with the diff "howl" makes for a pretty interesting sound. ONLY observed while in AUTO diff mode. Does not occur ever if in 2 HI. First time owning anything like this. I assume some extra noise from the front differential of a truck based 4WD system being engaged is to be expected, but have no idea what's normal and what isn't. No driveability issues or anything else to indicate any sort of trouble otherwise. And NO, I have NOT been running around on dry pavement in 4HI. I drive as the book recommends and leave it in 2HI most of the time, except if there's snow or rain in which case I switch it to AUTO. I think this momentary howling while accelerating happens at other speeds too, but by that time there's enough noise from other sources that it gets masked. Less than 5000 miles on the truck, and I think it's been doing this for awhile but have just tuned into it more lately due to using AUTO mode more often from snow/rain. Thanks for any feedback on this.
Wise choice. The 5.3L/6L80 is a perfectly good combination, especially with the 3.42 gearing. It "granny shifts and doesn't double-clutch like it should", especially on the 2-3 upshifts, so it's not going to light your hair on fire or anything, but it's about as bulletproof as you can get these days and doesn't have any of the 8-speed issues. I'm guessing you're also a 335i driver by your username? From all I've read, the GM 8-speed is nothing compared to the slick ZF 6 and 8-speed boxes in the Bimmers. At first I was a little bummed that you coudln't get at least the 8-speed in the these things with the 5.3L, but geez, seeing all of the issues I'm happy with the 6-speed. I'm good with the 5.3L/6L80/3.42 combo. Check out my blog thread ("How the Hell Do You Go From Driving a BMW 335i to a 2018 Chevy Suburban" LOL):
You can get 36.1/40.9" of legroom in the 3rd row with the bigger number being with the 2nd row seats all the way forward. 2nd row you get 41.5/42.6", which doesn't make sense because there's a good couple inches of seat travel. Anyways, there's lots of typos in Ford's brochure. Not sure what you can do simultaneously, but there's probably more overall passenger space available in the Expedition Max at the expense of cargo space. The Suburban you get a fixed 39.7" and 34.5" of 2nd/3rd row legroom. I can sit behind myself in the 2nd row no problem at 6'3" and be comfortable for a long trip, and a 6-foot tall more slender framed colleague at my office can fit just find in the outside 3rd row, so at least in my view, Ford sacrificed quite a bit chasing numbers on spec sheets at a huge cost to their cargo area. I guess if you have a family of 7-foot tall basketball players, the Expedition Max would be the one to get.
It's all politics. Enjoy your new truck!
I'm guessing their new turbocharged Inline-6 will find its way into the new one. What's next on the V8 front? Do they have a 4.0L TT V8 to replace it?
OUCH! Yeah silly Americans complaining about their gas prices! LOL
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