ok ive got auto hubs on my 94 toyota and they arent working and i sure dont want to diagnois wats wrong with all those vacume lines so can u convert it to manual hubs with no major work

 

its a pretty easy swap theres a few writeups in the tech section

 

Yes, but that won't solve your problem.

Lamm

 

what problem would that be

 

The front diff on your 4Runner uses ADD, the "auto hubs" are just drive flanges, switching them to manual hubs will not make your 4 wheel drive work. You need to fix the ADD system inside the diff (or vacume lines attached to it).

Also try using some .,?!;: and such please.

Lamm

 

The problem is you don't have auto hubs. You have ADD drive flanges.

Moved to newbie.

 

i have no clue how the add system works. I would think that u could just switch them and thats it.

 

What they is sayin is..

The ADD system works like this here: You got your CV shaft sticking through the center or hub of your rim/brake rotor. The CV shaft has some splines on the end of it. The ADD hub is just a solid donut of metal that is splined on the inside and it connects the CV shaft to your rim so that they spin in unison, all the time. If you take off the Hub Cap you can see the ADD plate right there. Its black, and its got six nuts (wow). The other end of the CV shaft connects to your front differential, which connects to the transfer case. From there on, I'm not sure how an ADD truck is different from a truck with originally manual locking hubs.

The Manual locking hubs are a more complicated piece of machinery which ultimately either connects or disconnects the CV shaft from the rims, depending on whether they are locked in or not.

The ADD plates and manual hubs are interchangeable, but by the sound of your initial question, it aint gonna fix nothin to change from ADD hubs to
manual.

If anyone can correct me or further elaborate on all that there mechanickery, please do.

 

well the main problem is that there is no vacume getting to the axel to change it into 4wd and does anything go on in the diff like a pin that switches to lock it internally like an arb locker

 

Are they? I don't think so. Otherwise, everything is worded really nicely.

 

what puts the cvs into 4wd and allow them to cnnect with the diff

 

They are.

 

They are for older trucks. Not for yours.

 

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

 

The CV joints are connected to the front differential. If you crawl up under your truck and look, you'll see the CV go into the back of the wheel assembly. On the other side it has a connection with six studs. That connection is to the differential. When you have ADD, or the manual hubs locked in, then the CV Axle is rotating with the tire, which is turning the gears inside of the differential. I think, and I might be wrong.. that the diff gears turn the shaft that goes into the transfer case and the transfer case has something turning as well, but it isn't getting any power from the transmission. I haven't the slightest on what makes the transfer case work.

If you have the manual hubs unlocked, then the CV shaft aint turnin' with the wheel, which means all that other stuff isn't moving either, which is why with manual hubs there is potential for a small gas mileage increase.

If your truck isn't going into 4wd, then something is wrong in the xfer case/xmission area.

I wish I could help more but I don't have any knowledge of how the transfer case actually engages, or is driven by the tranny.

Oh yeah if someone knows something I don't or can help back me up or correct me, again I'd appreciate it so that I know how to explain it later correctly.

 

The disconnect is not in the Transfer case on 94 trucks. They have a 2 speed shiftable transfer case. The disconnect is in the diff....hence ADD=Automatic Disconnecting Differential

Putting the truck in 4x4 triggers a sensor. This then triggers one of two valves located on the passenger side fender well. The valve allows vacuum from the engine to bypass said valve. That is connected to a vacuum actuated valve on the diff that then slides a collar in or out, depending if you are going in or out of 4x4.

If its not going into 4wd, then you may have an actuator, or a valve issue. Trying putting the truck on jacks, then manually applying vacuum to the front diff actuator to see if it locks in. Since the T-case is manually shifted, you know it is in 4x4 mode, and you thusly only have to worry about the diff. Thats why the 4x4 indicator sensor is in the front diff (on ADD rigs)

 

Thanks for the correction.