How to test drive 4runner 4wd system?

[Joeggernaut]

What is the proper way to test drive a 4runners 4wd system without causing binding to make sure the t-case, actuator, locking diff, and 4wd system is working properly when no loose driving surface is available?

I understand you can test 4hi and 4lo on pavement but don't lock the diff. Is there a safe way to make sure the locking diff works on pavement or can you only test this on a loose surface?

 

[SureShot516]

you can engage the center differential on drive pavement however go very slow and DO NOT make any turns,

from a full stop hit the button, light will blink move forward slightly if the light stops blinking the center dif. is engaged, stop the vehicle and hit the button again the light may not go off until you move forward a few feet

 

[JB.]

I understand you can test 4hi and 4lo on pavement but don't lock the diff. Is there a safe way to make sure the locking diff works on pavement or can you only test this on a loose surface?

Testing the diff lock on pavement is no problem at all. Just avoid low speed, tight turns. In a parking lot or even on road while driving straight, hit the diff lock button. It should engage pretty quickly but if it doesn't, let off the gas. It can be engaged while fully stopped, but works better in motion.

More reading if you're interested.

http://www.toyota-4runner.org/4th-g...pavement-center-diff-lock-vsc-off-switch.html

 

[Synister]

Ive had pretty good luck running through all the modes while in a space not much larger than a parking spot. Starting in neutral makes most of the modes easier to get into even though motion is also easy. I start in neutral and select 4HI, usually takes a couple seconds. If it doesnt engage, I hold the brake and select drive or reverse, the torque is usually enough to finish the engagement. From here I usually reselect N and then lock the center diff. Again, if it doesn't lock after a few seconds, selecting R or D is usually enough to get it to go. N again for 4LO, this engages the fastest at least for me. At this point the only actuator left for me to check is my rear diff lock. Thats tricky at a standstill but a non-issue for 99% of T4r owners. Good luck.