BlackWorksInc
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Functionally is a T4R in 4H without the center locked any different than AWD?
Yes and no. The Limiteds, like all the 4th Gen 4Runners have a T3 Torsen Center Differential. The center differential reduces the binding effect you get in 4WD and helps distribute the power balance better when one axle needs it without having to resort to locking the center diff. This is more for on-road manners more than anything else. They dropped the Torsen T3 being standard in all the transfer cases when they went to the 5th gens, it used to be in the 4th gens because they had a T3 Torsen it made driving the Part-Time 4WD units in 4Hi essentially the same as the All-Time 4WD V8's because the Torsen managed the quirks of driving in 4WD on road rather well.
That being said, you can drive these vehicles in 4Hi regularly in adverse conditions (i.e. snowy/very wet conditions) because the natural slippage of the road conditions doesn't strain it as much as driving on dry, grippy pavement (the same reason why they don't recommend using CDL on dry pavement, but it can be used in loose/slippery surfaces without too much concern). We have people regularly driving in 4Hi in the Tacoma, Tundra, and 4Runner when it snows out here. But you will notice some binding when you near full lock in these units, I normally throw the customer's vehicle in 2WD when I pull it into the shop because of the binding making turning onto the vehicle hoist annoying.
While AWD and 4WD essentially do the same thing (i.e. power 4-wheels), the main distinction is that usually that in a 4WD you have additional gearing in your transfercase where as most AWD's transfer case gearing is negligible on the final drive ratio and 4WD is typically un-biased.
The transmissions are one of the few things that are really different between SR5, Trail, and Limited.
SR5 and Trail are more similar, but Trail has a real stick for 4H-4L and SR5 is shift-by-wire (with a knob). Limited is much different.
ETA, limiteds have much more luxurious interior, and more electronics and creature comforts. One big difference (at least for the 2016s I looked at) is the regular radio key vs the new generation smart key (where you don't need to push a button, just get near your car to unlock, and key stays in your pocket with pushbutton start).
If you want more info, you should cross-post this on AR15.com GD, I usually only come over here if I want info on dissipator gas systems and chili without beans.:banana:
The "real stick" means nothing beyond the lack of one actuator. Your system is still computer controlled and any failure in the sensors, ADD actuator in the front, and/or ABS system (starting to see this on the newer vehicles) will default the system just as inoperable as the "Shift by Wire" set-up. The only fully manual 4WD system Toyota has made for a Toyota product in the US in the last 20~30 some odd years was the 6spd manual FJ Cruiser with Full-Time 4WD and a manual case, You could consider the GX470 a close second; but it does have an actuator for the CDL Function.
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