Hey I just discovered that Ive got automatic disconnecting differential badging on my front hubs.Does this mean I can put 4runner into or out of 4WD while rolling?...5SPD+4X4.

 

The ADD system is its stock form is capable of shift-on-the-fly.

http://www.4x4wire.com/toyota/tech/autohub/

 

Ok,looks like I got the better deal on mine with automatic disconnecting differential instead of auto-hubs which ended in 89.I like the fact that my 4x4 can be engaged without stopping.Thanks for your help!

 

A lot of people like the manual hubs better because there is no doubt that it's locked into 4wd once they are turned by hand. With ADD sometimes you have to roll a little bit to get it to engage.

There are other reasons people prefer and even convert to manual hubs like the ability to run a spool locker in the front and not have it locked while in 2wd (which isn't possible w/ ADD). But all in all, I'm w/ you - I like the fact I can shift on the fly and it's nice not having to stop, get out, and turn the hubs especially when it's snowing.

Also, you may know this already, but you still need to come to a stop and push the clutch in or put it in neutral before you go to 4Lo. Always come to a complete stop between 1st and reverse too when you're in 4x4. You should anyways (even in 2wd), but especially when in 4Lo. There's just a lot of torque on the transfer case and it will last a lot longer if you go easy on it.

 

Manual hubs have shift-on-the-fly so long as you have the hubs locked. I just keep the hubs locked all winter and no problems. Manual hubs are just more reliable in my opinion. There are lots of vac lines and such that can go bad. Hell, the ADD vacuum diaphragm on the modulator on my 4runner got stuck in 2wd. I didnt have 4wd for a while, so thats why I bypassed the ADD (already had the manual hubs, but still had ADD on the differential) Also, shifting in and out of 4wd is a lot smoother without the ADD stuff.

 

Oh yeah, forgot all about that. I even used to do that in my old 22r pickup. No doubt manuals are more reliable. But ADD isn't too bad, mine has always worked good.

 

What he said.

 

Ok thanks will keep these posts handy.I know always stop when changing directions even tho some retards dont.I will remember about 4LO,but am a little concerned when reading comments in here about making turns when 4HI is engaged.

 

Well, dont drive in 4HI/4LO on dry pavement (or really even wet pavement from rain). It can bind the drivetrain and put huge stress on the components.