Hey guys I’m new here and I have a couple questions.

i have an 87 4WD with 32/11.50/r15.

I normally will go up hills in 3rd gear at 65-70 MPH.

only for 5-15 minuets at a time,
no tachometer and engine seems to be running high rpms.

 

My 22re engines might see a speed like that going down hill with a 50 mph tail wind

then I can turn the engine over with my hand on the crank pulley

Then all hills are not created equal

So many different things play into this equation

 

Gearing will also change what this means. Do you know if the PO regeared it? 32" tires fall into that grey area where half the people are dying to lower the gearing and the other half thinks it's ok. I decreased my tire size which has the same effect as lower gears (I went from 31's to 29's).

If you have stock 4.10 gears in the diffs, you're right around 4200 rpm at 70 mph. That's no problem for a healthy engine with good maintenance. 22re redline is 5750 rpm, and the owner's manual recommends shifting between 2000-4000 rpm.

I've revved to 5000 rpm in 2nd gear (49 mph with my gears and tires), with no ill-effects, just pulls hard and sounds real loud.

 

Read your your user's manual. It lists max allowable speed for each gear. Then convert that to what what is equivalent speedometer reading knowing your new size tires.
Also, like ^^ you need to check if P.O. re-geared.