MOTO193

hey everyone i just bought my toyota pickup and tried to use four wheel drive and nothing. The 4wd indicator comes on but still in 2wd. Put in 4lo and is in low range. Any help would be grately appreciated. im new to my pickup and dont know much about toyotas. also front drive shaft and rear drive shaft turn while in the air just to let everyone know.

91_TOYOTA_4x4

sounds like the vacume for the differential disconnect (ADD) is leaking. basiacly when you put the shifter in 4wd the front diff locks in the drivers side cv axle, when you get a leak in the vacume it wont lock it in and you get no 4wd lol. check for vacume leaks

BackGateYota92

do you have locking hubs maybe and have em unlocked???

xxxtreme22r

doubt that back gate since he said he has 4lo, however he doesnt restate that the front tires are spinning and he's really in 2wd lo. so you might be right

thook

I believe all he meant was the transfer case atleast goes in to low range gear.

MOTO......this diagram shows your set up:
http://personal.utulsa.edu/~nathan-b...26addcontr.pdf

There's two vacuum hoses that run from the actuator to the solenoids on your pass side wheel well under the hood. Follow them from the actuator to the solenoids and see if any are disconnected or have holes......first. If everything looks good, then you have other things to look at.

xxxtreme22r

I agree. But weren't some 92's manual hub as well? I know 92 Toy's is. But for the sake of the O.P. we will have to assume he has A.D.D. (automatic disconnecting differentials.) Had to add that in case he thought I meant ADD. lol

thook

I suppose if Jerry's is, that would mean some were/are. Wasn't aware of that.

thook

I just looked at his pic in his profile. He doesn't appear to have manual hubs.

xxxtreme22r

yup. manual hub

xxxtreme22r

yup A.D.D.

thook

Yup....

BackGateYota92

i have a 92 and mine has a locking hubs. and xxxtreme the reason i said that cause i will leave my hubs unlocked and put it in 4 lo and play around in 2 lo. lol you can deff feel a difference but since he got A.D.D. he cant do that. lol

xxxtreme22r

lol yeah that's why I covered my butt when I mentioned he never said whether or not the tires were tuning in 4lo and he was really in 2wd lo. I do that all the time in mine too, leave the hubs unlocked and slap it in 4lo, just to amaze the local kiddos lol.

Kiroshu

They have been putting manual lockers on yota trucks all the way till about 99.

MOTO193

hey everyone appreciate the help. but now cant get the differential to unlock, tried driving backwards and it binds up and a loud clank will happend like the front is locking up. need help a.s.a.p thanks guys.

xxxtreme22r

what did you do to get the 4wd to work?

MOTO193

blew the lines out with an air compressor and one of my friends told me to just blow some air in the actuator. i guess it worked but now i cant even drive down the road.
but now cant even drive down the road without it binding up.

xxxtreme22r

maybe you damaged the actuator, I don't think those things were designed to be pressurized like that, but I don't have any experience with the ADD system, all I know it's vacuum controlled not pressure controlled.

MOTO193

i think i got it to free up. they both spin freely and the front drive line doesnt spin either. i think im going to just get manual hubs here in a week or two. what do i need to do this. can i get rid of the add ?

BackGateYota92

ya man i think manual hubs would be the best bet. they are so much easier in the long run.