4WD not working right

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H

hbaldan

10 Year 15 Year
Joined
Jul 4, 2007
Threads
9
Messages
24
Location
Gaithersburg, MD
Hello all, I FEEL SOOO DUMB :bang::bang: I just had a used transmission/Tcase combo installed. HOWEVER, I think it's stuck on 4WD and maybe the mechanic did not do it right. How do I know if it's on 2WD or 4WD?
In order to be on 2WD for regular driving, what do I need to do?

4WD?

The small sitck shift has 2 positions, 2H and 4L where is it in FULL 4WD
in case I get stuck on mud or snow?? there is also a switch behind the steering weel that says "4H"....

Can someone explain to me the full use of the 4WD???

Thank you.
 
i guess your talking about a 62. you're never really in 4wd till the transfer case (TC) is in 4wd and the hubs are locked, so if it really is stuck in 4wd you can still drive it with the hubs unlocked and not have an issue. if i understand your question right, 4h is the option you'd use for mud or snow, and you get there by using the button, not the lever. one way to test if it's always in 4wd at the transfer case is to spin the rear wheel(s) either on a jack or driving very slowly, and have a second pair of eyes looking at your front drive shaft. if it's moving, the TC is in 4wd. hth
Drew
 
no 4x4= not locked, less wear of drive train and less gas usage, no button pressed (no light) and small shift stick forward

4x4 hi speed=locked, button pressed (green light on), small stick forward,max speed 80 kilometers, button can be pressed while driving slow/not hard on throttle while pressing button.do not push clutch and release as much as you can.

4x4 low=locked, STOP!,small shift stick pulled towards seat makes green light go on, max. speed 45 kilometers, no hard turns on asphalt! Dont push the clutch at all, only while shifting.

If you have/or for PTO there is a middle (N) in the small shift stick that does nothing but the pto will turn:
H2
N
L4
 
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The transfercase engages the front axle electronically (well by vacuum control really).

To use 4x4 High, leave the stick in "2H" and push the 4H button the dash. When it 4x4 is engaged, a green 4x4 light will come on the dash.

For it to actually work, the front hubs must be in the locked position.

If you want 4x4 Low-Range, you just pull the stick down into the 4L position.
 
4WD

THANK YOU, you all are helping a lot.

Now, I disengaged the hubs, put it on "2H", depresed the "4H" but the front drive shaft is not free, I tried to turn it by hand and is locked. I then locked the hubs, put it on "4L", and it will not GO slow like it's supposed to, it still drives as if it was on 4H...

What could it be? did the machanic mess something up? did he inverted the vacum lines on the TC?
I am not a mechanic but I read something about inverting the vaccum lines...

Thank you all again
 
you may have two different problems

The shifting between high and low range is all mechanical. The shift lever moves a fork in the transfer case to move gears to select either high, neutral or low range. When the lever is in low, the low range gears should be enabled regardless whether you are in 4wd and regardless whether your hubs are locked. If you have moved the lever into low buy the low range is not engaging, then the first thing to check is the linkage. There is a shift lever on the top right side of the transfer case that rotates to select high/neutral/low. If this seems to be moving properly, then it could be that the rotating shift lever has slipped down and is not properly moving the shift fork. You might be able to correct this without removing the transfer case, but it is tricky.

2wd vs 4wd is selected using electric switches that control vacuum (this is different that what is shown on the attached diagram). If the vacuum lines are incorrectly connected or one of the vacuum switches is bad, you may in fact be "stuck" in 4wd. If the vacuum lines are switched between the two, then your 2WD/4WD dashboard switch may work backward. There are trouble shooting procedures for the vacuum circuit in the factory service manual (see attached PDF)
transfer case a.webp
 

Attachments

Hi, you guys seem like you got most things covered but I vaguely remember being confused a few years ago about mine Engaging and Disengaging and found that I had to at a stand still place mine in reverse and give it a slight nudge backward then select Forward and give it nudge forward and did this a few times while turning steering wheel slightly left n right and could hear and feel it actually engage or disengage which I dunno if it is just an auto thing but I can imagine that at times from lack of use or just not meshing correctly it required some jiggling pressure if you know what I mean. We use to do the same sort of thing if your starter motor and flywheel didn't mesh upon starting by turning engine off for manuals while left in gear and rock car backward and forward and then try start again. I soon worked out that specific click could be heard and upon driving forward it became very noticeable the drive had changed. I've thrown my comment in because if you trying to do this in the garage opposed to in the field this could be part of it but correct me if I am wrong as I am no expert on these vacuum subjects but will be watching mine now because there is 2 vsv where vac lines could be swapped.

Sent from my iPhone using IH8MUD
 
The solenoids are on the passenger side of the firewall. One is blue the other redish brown - they're mounted on a comon bracket that bolts to the firewall. There is a single vacuum line that feed both from the side and two vacuum lines that drop down the firewall towards the transfer case.

Pull the vacuum lines that drop down towards the TC off and swap them. Be careful as the solenoid barbs are plastic and get brittle with age. The green 4WD light on the dash should go out (or on depending on where you start from). Press the 4WD dash switch again and see if goes on or off. If it changes then the solenoids are OK. If they're OK then it's on to the vacuum actuator on the TC.

There are many posts on this. Try searching the 60's section for FJ62 4WD

Photo stolen from the link in post #9
burntoutredVSV.webp
 
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