Topic: Trouble with my duals

[84yotated]

So the other day I was toying around with my truck and when I tried to switch it back into 2wd, the tcase was stuck, I ended up trying to force it into 2wd and snapped my twinstick shifter. I pulled it into the garage and took the shifters out and used a screwdriver to shift and when I got it out of 4wd it was like the tcase was being binded and the load was released when it shifted. Anybody have any experience with this?
thanks, Ted.

[83yota5960]

my buddy just did duals in his 4 runner ran in to the same probablem, he hasent took them apart yet to look and see whats up. i also did a 4.7 in my case and had similar probablem ended up taking the case apart twice and everything was right ended putting the shifter in backwards and that worked. ive seen alot of these poping up lately.

[Cheesemaker]

See this alot.  Generally, the reason is there is still a load against the gears.  And you have to really force it to get the gears to shift.  The solution is generally you have to back up/go forward a little to release the tension.  My stock case will do the same thing, and I just got to release the tension, and it will shift very easily.   

[4-lo]

See this alot.  Generally, the reason is there is still a load against the gears.  And you have to really force it to get the gears to shift.  The solution is generally you have to back up/go forward a little to release the tension.  My stock case will do the same thing, and I just got to release the tension, and it will shift very easily.   

x2


put her in gear, hold the clutch push the shifter forward to 2wd release the clutch it works for me.   i bet its common for all wheelers even stock 4x4.  my cousins stock did the same he played with it for two hours then finally gave up and called me, i got there spend more time talking bs then putting her back in 2wd in a flash.

[4-lo]

  it could be something else too...brand of gears installed in the case...we have four two with mc gears and two with tc gears.  the two with mc gears we have no problem with it doesnt matter if you use just 2.28 without putting the rear in 4wd.  the two tc gears you cant do that it gets stuck, so one trash the tc and went with mc gears and sure enough the problem was gone.

[fordh8r]

See this alot.  Generally, the reason is there is still a load against the gears.  And you have to really force it to get the gears to shift.  The solution is generally you have to back up/go forward a little to release the tension.  My stock case will do the same thing, and I just got to release the tension, and it will shift very easily.   

This!  It's because of the binding between the front and rear drive shafts through the case which binds the gears together very tightly. Usually if you get a slow roll going and step on the clutch, rocking the steering a little from side to side will unbind the drivetrain enough for the shift to come easy. It's not as uncommon as you might think. Just don't force it! You already see what happens when you do. 

[84yotated [OP]]

Alright guys sound good! Thanks for the info!

[twisted metal]

It also helps to back up just a bit when this happens if you are going foward. I don't recall having this issue
in reverse but mine does this occaisionally and I can stop put it in reverse and just barely move and it slips
right out.

[BigMike]

The comments about the case being in a bind from unequal forces acting on the rear and front drive shafts are correct. It's the same principle as to why a front selectable locker (such as a Zip Air Locker or a Toyota E-Locker) won't unlock if in a bind. Rocking back and forth is a good method to free the drivetrain, but if you have to reeeeally force it, then don't. Just keep driving for a few more mins and then try it again. Either it will disengage 4WD normally or it won't. I also believe that Twin Stick equipped rigs are more likely to disengage 4WD (I do this often to help turn sharp corners) so it's possible that you just never noticed it as much before.

Larger tires and/or airing way down will also add resistance to the front end which will require more time for the stresses and loads to naturally work their course.

Regards,
BigMike