why wont the 4x4 in my 95 t100 engage - YotaTech Forums



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why wont the 4x4 in my 95 t100 engage

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Old 04-24-2017, 08:00 AM   #1
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why wont the 4x4 in my 95 t100 engage

took it mudding and then it sat for the winter now it wont engage
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Old 04-24-2017, 09:52 AM   #2
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Engine and transmission type?? manual locking hubs???
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Old 05-12-2017, 07:37 PM   #3
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I recently bought a 97 where the 4x4 didn't engage and it turned out to just be the vacuum switching valve needed to be replaced, easy $25 fix.

Here's a picture of what they look like - https://cimg7.ibsrv.net/gimg/www.yot...eb92891893.jpg

Mine was all rusted out (as you can tell) so just replacing that one switch fixed it
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Old 11-09-2017, 01:43 PM   #4
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Im in orem utah with 4 T100s. Hit me up i have lots of know how for these things. My dads doing a rrar mount turbo on his and im supercharging mine. Reply and tell me what you need and what your looking for.
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Old 12-09-2017, 08:48 AM   #5
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The problem with mine was the actuator and it's very common. There's a forum online about bypassing this (ie. locking the actuator's collar into 4wd position) and getting a set of locking hubs. Has been working fine for me.
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Old 12-09-2017, 08:59 PM   #6
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The problem with mine was the actuator and it's very common. There's a forum online about bypassing this (ie. locking the actuator's collar into 4wd position) and getting a set of locking hubs. Has been working fine for me.
I bypassed mine. And honestly i just run it like that. No need for manual hubs for me yet anyways, because ever time i shift my tranny into 4x4 its instantly into 4x4.
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Old 12-15-2017, 05:37 AM   #7
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My 97 T100 V6 SR5 does nothing when I shift into 4wd. This problem started over a year ago but with winter bearing down I NEED 4wd ASAP. I have cleaned the front actuator switch, checked the oil in the front diff. and made sure there is vacuum pressure throughout the ADD system (which is the case). When I shift into 4wd the dash light does not illuminate and as far as I can tell nothing in the vacuum system changes. This leads me to believe the wiring from the shifter is compromised and wanted to know what that wiring bundle/harness is called in order to reference it when/if I bring the truck in. Also, does anyone know of a source for a free online service manual for this vehicle? Thank you!
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Old 12-15-2017, 07:16 AM   #8
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My 97 T100 V6 SR5 does nothing when I shift into 4wd. This problem started over a year ago but with winter bearing down I NEED 4wd ASAP. I have cleaned the front actuator switch, checked the oil in the front diff. and made sure there is vacuum pressure throughout the ADD system (which is the case). When I shift into 4wd the dash light does not illuminate and as far as I can tell nothing in the vacuum system changes. This leads me to believe the wiring from the shifter is compromised and wanted to know what that wiring bundle/harness is called in order to reference it when/if I bring the truck in. Also, does anyone know of a source for a free online service manual for this vehicle? Thank you!

Pull the actuator off. Slide the ring over in the dif and the fork over on the actuator , put on a clamp, and you will have 4wd as soon as you shift into it
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Old 12-15-2017, 07:17 AM   #9
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Pull the actuator off. Slide the ring over in the dif and the fork over on the actuator , put on a clamp, and you will have 4wd as soon as you shift into it

If you don't know how ill do it on my dads T100 and post pics
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Old 12-17-2017, 07:00 AM   #10
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I bypassed mine. And honestly i just run it like that. No need for manual hubs for me yet anyways, because ever time i shift my tranny into 4x4 its instantly into 4x4.
The manual hubs are for the increased fuel economy from not having the axles rotating when not in use.
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Old 12-17-2017, 07:12 AM   #11
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My 97 T100 V6 SR5 does nothing when I shift into 4wd. This problem started over a year ago but with winter bearing down I NEED 4wd ASAP. I have cleaned the front actuator switch, checked the oil in the front diff. and made sure there is vacuum pressure throughout the ADD system (which is the case). When I shift into 4wd the dash light does not illuminate and as far as I can tell nothing in the vacuum system changes. This leads me to believe the wiring from the shifter is compromised and wanted to know what that wiring bundle/harness is called in order to reference it when/if I bring the truck in. Also, does anyone know of a source for a free online service manual for this vehicle? Thank you!
That front electric switch is just for the 4wd indicator light on the dash. What you need to check is the vacuum actuator on the front diff. You probably have a vacuum problem preventing the actuator from engaging the 4wd. I bypassed the vacuum system by opening the vacuum actuator, drilling a hole through the diaphragm and housing and putting a screw through the diaphragm fixing it against the back wall of the diaphragm housing.
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Old 01-07-2018, 07:52 PM   #12
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Thanks guys, I have vacuum pressure at the front dif. and I checked the ADD switches (which have continuity and vac pressure, so I think it's electrical. Could someone post a link or show how to bypass the ADD system?
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Old 01-08-2018, 01:54 AM   #13
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Thanks guys, I have vacuum pressure at the front dif. and I checked the ADD switches (which have continuity and vac pressure, so I think it's electrical. Could someone post a link or show how to bypass the ADD system?
http://www.4x4wire.com/toyota/tech/add/The link says the VSVís are located on the passenger side of the engine bay. I think thatís only for the 3.0. My 3.4 had the VSVís on the driver side.

Last edited by t1oo; 01-08-2018 at 01:56 AM. Reason: Forgot something
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Old 01-08-2018, 12:10 PM   #14
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Thanks guys, I have vacuum pressure at the front dif. and I checked the ADD switches (which have continuity and vac pressure, so I think it's electrical. Could someone post a link or show how to bypass the ADD system?

Ill do it to my dads T100 when i get off school because i already did it on my T100. Ill take pics and post them here and also on a new forum
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Old 01-08-2018, 07:57 PM   #15
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I have the step by step on how to do The ADD Delete below. All photos and everything below i did myself so ( f u copyright)

My Dads 96 5vz 5 speed 4x4 288k. Its about to get painted , thats why its all sanded paint.

My truck. ADD delete i did on it right before Thanksgiving and i Have put 10k miles on it since. So works great and no issues. 1993 T100 3.4 5 speed 4x4 320k miles.
Grab an oil pan and drop the skid plate, its held on with 4 12 mm
What it should look like.
See them 4 12mm? Take them off after you drain all the oil. Some more will come when u pull them 4 bolts. So grab a rag.
With the 4 bolts off it will be stuck om still. Grab a hammer and tap the back of it off. If you dont like to get your hands super greasy, Take off your nice clothes and buy some fast orange from harbor freight and deal with it
This is the disengaged postion, You want to slide it to the left, But not to far.
This is too far to the left. It can get stuck their sometimes and youll have to use a flat tip . you want it to just cover those teeth.
Since im just a 15 year old, I forgot to take a pic of the slider in place inside the axile tube, but if you read all my captions you will figure it out. Slide the fork all the way to the side with the wire clip and then put a clamp on that tube. This part can be a PITA sometimes so make sure you have patience and a good clamp. It took me an hour because it can be hard to get that clamp back together . because you have to pull the clamp apart to get the clamp on the tube.
Afterwards put all the bolts back in after you line the fork up and stuff. Use some of the old vaccum lines and plug the 2 ports on the ADD System into each other for extra precaution and to keep crap out of them.
This is a shot off my truck of the add system. I got rid of the wires and this pic also shows you how to plug the lines into each other just incase you need it.
These are your vsvs. Pull them off and junk em, you dont need them anymore.
See these old lines? Pull them off and do what you want with them. I keep them since they $$.
See that ugly thing inside your wheel well? Take it off and junk it.
See the line in my hand? Take it off.
Thats what i did on my truck with the open port from the old hose in the last pic.
Their you have it. I don't have the best grammar because i am only 15. I love T100s and theirs nothing on these trucks i haven't done. Ill post a new forum tomorrow in the T100 section. Hope this helps other people. Works great and feels amazing im 4x4 for me anyway.
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