fiveduece

I have a 96 t100 with 3.4 V6, MT and auto front hubs. I recently found out the hard way my 4wd doesnt work, and im looking for some help as to what my problem may be. I know everyone says to get rid of the ADD the truck has, but at this point in the trucks life, its not worth it, and thats not my problem in this case

Ok, heres what i have. front driveshaft never spins. I never get 4wd indicator light on dash although i do here a clicking sound when i go from 2wd to 4hi, I can get low gear range when I shift to 4low, but im still in 2wd. I assume with the ADD my front driveshaft should spin all the time whether im in 2wd or 4wd. Since it never spins, im thinking something in transfer case is not working. Do i need to start looking for another Tcase? Any ideas, any fixes? thanks guys...

250000_yota

It sounds like your on the right path in thinking about the tcase. If the front drve shaft isn't turning, then the front drive is not being engaged. Unfortunately, that means that you have damaged either the shift rail, the hub that engages the chain to the shaft, or worst case, you've slipped the chain or broken it completely. Start by draining the fluid into a container, using a rag to catch any debris. If you find any, chances are something has failed and you'll need to remove the case and figure it out.

fiveduece

thanks, any ideas on good places to look for a used transfer case?

250000_yota

Depend. Where are you located? I know here in Colorado we've got the yota yard or yota Jim's...otherwise search carpart.com or a local junk yard.

waskillywabbit

iTrader: (-1)

You do not have "auto" hubs. You have a ADD system with drive flanges.

:wabbit2:

fiveduece

That's fantastic, but still doesn't help me on why my front drive shaft won't spin.

Anyone know what all transfer cases will fit a 96 t100 sr5 with manual Trans?

waskillywabbit

iTrader: (-1)

If you don't understand what actual 4WD system you have good luck actually figuring out how to fix it.

:wabbit2:

250000_yota

The T100 uses a VF1A chain driven case. It's found behind T100's, 4Runners and pickups with the V6.

Here's a chart that spells it out a little better.
http://www.4x4wire.com/toyota/faq/parts/

fiveduece

Thanks alot, that website has the most information ive found yet.

250000_yota

Ya the wire has a lot of technical info, and its well documented and organized.

Zpd426

While in two wheel drive your front drive shaft doesn't spin while your moving? You could have an issue with the ADD as well.

The light could just be that the sensor is disconnected, look for a loose connector hanging on the driver side of the motor. My connector is screwed up so my dash light doesnt work either.

I loved my ADD hubs until my driveshaft wore out...

Good luck with the Tcase!

250000_yota

With ADD and I'm assuming an open differential, the drive shaft should not be turning. Having an open differential would mean that only the drivers side axle would be trying to move the carrier, but because their is not an equal input on the passenger side, then it harmlessly turns the drivers side spider gear. Having a limited slip or locker in the front would counter act the normal operation of the ADD system, turning both the carrier and the driveshaft, putting unneeded wear and tear on the entire front drive system. This is exactly why I installed my manual hubs to completely eliminate spinning any of the front components while I'm driving on the street.

Z, you are right in mentioning the 4wd switch on the side of the tcase. I blew right by that and jumped right to the worst case. Definitely check to make sure all the connectors, including the ones to the VSS for the front differential actuator on the inside of the drivers side fender are connected correctly.

Zpd426

Ok. I have a front locker. That makes sense. Ive always had the front locker so I go right to that line of thinking.

250000_yota

Eh no big deal Z. I was actually going to pm you about your front locker. Do you like it? I'm at a point with my truck that that's about the only thing left besides armor and s/c...

Zpd426

I have a true trac in the front actually. Im so used to just saying locker to everyone.

I love it. It really helps to get places and pull through mud etc.

I wish I had a selectable one though because it is a handful in certain situations where you have to make a very tight turn under power.

Also I would like to have the option of turning it off for icy road situations.

I think every vehicle should have at least one locker. All my vehicles will have front and rear lockers though. I think its worth it.

250000_yota

Ya, the icy road situation is the biggest thing holding me from getting something up front to help out. I got a 35 mile drive to work now, and with winter comin up ill be drivin the truck more and more. If I did I'd have to do an ARB just so I could keep it open till needed. I love the true trac in the rear of mine though. You can hardly notice it in turns but it still helps quite a bit off road. You have a true trac in the rear too?

Zpd426

I live in southern California so its no big deal for me but for the occasional snowboarding trip it would be nice to have.

I have a Detroit ratcheting locker in the rear (just changed it in my sig.). That thing kicks some serious butt, I can go tons of places in 2wd and its great for drifting turns in the desert

Vin4Runner

Whats ADD?

250000_yota

Automatic Disconnecting Differential. It was toyotas fancy name for shift on the fly 4x4. It uses a actuator to disconnect one axle from the differential.

The top differential is a standard differential. An ADD front differential is identical, but it uses the axle tube on the bottom to disconnect the drivers side axle from driving the differential when not in 4wd.