Stock SR5 and OffRoads are roughly 1.75" higher in the back than the front at their stock height.

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Yes, this is generally accurate; stock Toyota 4Runner SR5 and OffRoad models typically sit slightly higher in the rear than the front, with the difference being around 1.75 inches at stock height. This design characteristic is intentional to help level the vehicle when carrying cargo in the rear.

Are the rear springs longer and/ or the rear suspension is different than the pro?

I ask this b/c i installed 1" bilstein rear shocks and ended up with like 1.75 to 2" of lift...so this might make sense i guess..

 

I guess I'm confused about the AI part of your post. Does that have something to do with the rest of the post, or does the non-italicized portion of your post stand alone?

The springs are the same, they are not longer. The rear "shocks" don't determine ride height.

 

I went with an OME 2" lift kit all the way around, and I chose the beefy "heavy"(?) spring option, since I wanted the option of carrying quite a lot. The result is that the truck has a noticeable rake to it. More than I like. There is no way the rear will sag unless I put a Sherman tank in the back, and if I had it to do over again, I would go 2" in front and 1" in back.

 

The 4wd 4Runner is right about 1.6" higher in the front than the back.
If you do a 1.5" lift up front you are basically right on track with level. Meaning the bottom rocker panel will be right at level with the ground.
If you do a 2" lift up front the front will be slightly nose high and it will make the rocker and running boards slightly higher in the front than in the back
If you do a 2" up front and 2" out back with heavy duty springs you most likely got more than 2" of lift in the rear while you are unloaded. I think those springs are considerably heavier for people who are running roof campers and rear decks and heavy hauling. Your 2" lift rear springs may give you closer to 2.5" unloaded. This combo will no doubt give you as much rake as stock or more. If it were me and i were you, i would pull the rear springs out and run stock springs with a 3/4" spacer for now until you do decide to load it down. If you are not going to load it down permanently maybe look into the Eibach 1" rear lift springs. They give right at 7/8" lift and are about 50lbs stiffer than stock if i remember correct so they would sag less than OEM springs if you put weight in the back periodically.

My favorite setup is +2.5" up front and Eibach 1" springs out back. This makes the rocker and running boards practically perfectly level with the ground, keeps the front end in check and can still get the alignment specs with OEM arms, and looks tougher and allows for the tire size i like. This slightly stiffer spring also doesnt sag when you put a person in the back, or cooler and luggage on a trip. You basically run perfectly level all the time down the road.

 

This is exactly my thought. I haven't bothered to measure, but I'm convinced that I got significantly more than the 2" of lift in the rear by going with the heavy springs. For a time, I did have a lot of weight on the truck, while I was living out of it. But that's no longer the case. Unfortunately, the stock parts are long gone, and even if I had them, I would never use a spacer...I just have a mental block against them. lol I'll most likely just suffer with a look I don't care for, since I don't have the money to play around with it at the moment.

 

Last time I investigated this, the only difference in springs on the 4Runners was on the Limited models. All others are the same on the rears.