toyota ADD front diff questions

[TRD Runner]

got a 95' runner and just recently did a v8 swap. I'm looking for a vacuum switching valve to controll the front diff. not sure if anyone has had the same problem or not but I want the 4wd to work. I'm realy looking for something electric so I don't have to get out and turn a vacuum valve outside the truck. need 1 imput, two outputs. something to switch vacuum back and forth to the two outputs. anybody know of any thing like that or suggestions let me know.- thanks

[RockCrushinToy]

do you have a dodge front axle?

[TRD Runner]

no, why can you use something off them?

[b4runner]

i am gonna have this same problem i think, I am gonna be using a dana 300 transfer case but i still wannna use the ADD if i can. I am gonna get manual hubs anyways for the front, but like i said i still wanna use the vaccum loking hubs. anymore news on this??

[stump runner]

i had a 77 cherokee that had the quadra track. it had a vacuum valve in the glove box to controll the transfer case lock up. works with small vacuum line that would be easy to run where ever you want it

[b4runner]

but do you understand how it works?? Like i have a rough idea, it uses engine vaccum to keep the front axle unlocked then it usees a switch or relay in the transfer case to add vaccum to the other side of the line that locks it. But i don't know how i would have a valve or something to control this if i am use a completley different transfer case then the toyota one

[ut4crawler]

Why don't you use the vacuum solenoids that came with your vehicle. They have a electrical signal that opens and closes them. Just ground one ends and add a hot lead to the other from a switch on the dash. The soleniods were located in the middle of the passenger fender engine compartment. Or you can get the axle stub from a 1986-1989 truck or 4runner that had ifs, they did not have the adds yet. I know for sure on 1988 4 runner that is what I had before my solid axle swap. Then it is solid axle shafts to the CV's on both sides.

[b4runner]

thanks you, i will look into that more. That is what i was wondering. I didn't know it was triggerd electrically. I thought the vaccum was trigger somehow from the transfer case not being electrically. So i could use a toggel switch somehow then?? What wires do i tap into then?

[b4runner]

anymore advice on this topic at all?? I am just about to get into the swap and haven't found out all that much about the ADD system so far as to how i can keep it with a transfer case swap like i am doing

[fourwd1]

AFAIK the system uses the same switch on the t-case that lights the 4WD indicator on the dash to control the vacum motors that work the ADD (how simple can you get).

A toggle switch on the dash would take care of that.

[fourwd1]

It took seconds to find this (http://www.4x4wire.com/toyota/tech/add/) and this (http://toyota.off-road.com/toyota/article/articleDetail.jsp?id=399612)




Y'all really should learn how to work the internet better, GOOGLE is your friend.







:grin:

[b4runner]

I have seen both of those site, however they don't really get into the wiring behind it, Just the vaccum hoses and solenoids. But i think i discovered which wires i am gonna tap into for the toggle switch.