4X4 solid front axles, I can't find my owners guide but remember the tire pressue for front tires showed 20lbs, much more for the rear (don't know what the 2 wheel drives are?). 20lbs makes it too hard to steer so always have kept the pressure at 24-27, usually 26lbs in front and about 28 in rear unless hauling a large load then 30-32 in rear. My trucks without power steering.

I don't know but think the reason for lower pressure in the front is to help prevent a bent axle, can't think of another good reason or the guide is a misprint. The spring travel is very short and going into a big ditch at speed could mess things up. I know the axle isn't that strong as I bent a axle housing in an accident once so now I hit the bakes when I see a big pot hole or open culvert.

No matter I'll continue with the lower pressure but would be interesting to know what pressures you keep your tires at. I'm using close to stock tire size 235/75/15.
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Go with what's on the tire. Unless your using OEM tires from when it was new the "tire pressure" chart in the owners manual doesn't do any good.

 

The tire only lists maximum pressure.

20psi sounds like a misprint; that is *very* low and probably unsafe.

I currently have all four at 43psi cold (my tires take up to 44); I had 34 all around and that felt slightly softer.

I've found 30-35 to be a good pressure for most average-weight road vehicles.

 

What does your data plate inside the driver side door jam say?
Mine says 32psi for the stock H78's.

I run 25-28 in my 35x12.50x15's

 

Correct,
I got this 1st paragraph off wikipedia;

Inflation pressure[edit]

"[[Tires are specified by the vehicle manufacturer with a recommended inflation pressure, which permits safe operation within the specified load rating and vehicle loading. Most tires are stamped with a maximum pressure rating. For passenger vehicles and light trucks, the tires should be inflated to what the vehicle manufacturer recommends, which is usually located on a decal just inside the driver's door or in the vehicle owners handbook. Tires should not generally be inflated to the pressure on the sidewall; this is the maximum pressure, rather than the recommended pressure.[26] ]]"


...Yes to get maximum load capacity inflate to whats stamped on the tire so at lesser pressure theres reduced load cap. My truck data plate shows front axle 2630lbs and rear axle 3000lbs @ 32psi . With heavy loads like a bed full of sand or fire wood stacked above the sides I inflate to max but not for everyday driving.

...BTW, I have collected Corvairs many years ago and one problem the car had was people in the 60's & 70's going into a gas station and the attendant would just assume tires should be 32psi. there were cases of corvairs flipping over cause of this too high of a pressure that should have been half what was inflated to. Those were usually Bias ply but with radials I found I could safely put about 22-24lbs in front and about 28-30 in the rear, just about like the Toyota truck with stock size tires. I'd zip my Corvair through the canyons and run at 80 on the freeway in summer with no problem.

 

This is true if your running STOCK tires, not just the same size but the same ply and load rating. I don't run my tires at MAX PSI, I go about 75-80 percent of the max. Which is about 40PSI. With 20psi they look flat. My TPMS goes off when they drop below 28PSI.

 

I run my front ones at 32si the rear ones at 45psi on the Tacoma 235/75/15

On the 4 Runner i run 32 psi on all 4 same size tires