71 fj40 how to engage/disengage the 4wd?

Joined
Jan 14, 2012
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740
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Vacaville, CA
As the title says, if like to know how engage and disengage the 4wd. The previous owner mentioned the vacuum may not be hooked up so further more I’d like to know the diagnosis portion as well to ensure it’s functioning.

Thank you in advance.

The truck is all original by the way.
 
Joined
Feb 3, 2020
Messages
440
Location
Stanwood, WA
There’s a knob and a lever low on the dash, to the right of steering wheel. Pull the knob gives you 4wd (in is 2wd). With the lever all the way forward, you are in t-case high range, pull one notch and t-case neutral, pull all the way toward you and it’s in low range and should also engage that 4wd knob.
To test, lock front hubs and get on loose surface and floor it in 4wd to see if front tires spin.
Depending how the vacuum isn’t hooked up, you could have a huge vacuum leak.
3FEEB79D-1D45-4153-9924-1CA8CBB90AF7.jpeg
 
Joined
May 3, 2016
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1,206
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odessa, tx
If it's like my old 69 it may not have locking hubs and the vacuum pull engages the transfer case front wheels

Here is a link to SOR diagram. As stated above the lever is for high, neutral and low gear.

 
Joined
May 3, 2016
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1,206
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odessa, tx
It's a pretty cool set up. I loved having it on my 69 without the locking hubs. Just pull the nob and you are in 4wd. Didn't have to get out. I'm lazy
 
Joined
Mar 11, 2020
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SF Bay Area, Ca-NorCal
Not sure it has the lever at the bottom of the dash. Here is a pick

View attachment 2794066
It's there right next to the parking brake with strings (?) attached to both knob & lever. (I zoomed in). If you make it down to to the 580/680 split, I'm in Dublin/SR with a 1970 for reference. While ours is not as nice as @Skreddy 's S.Green, but it's original and S.Green :)
 
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Joined
Jan 14, 2012
Messages
740
Location
Vacaville, CA
It's there right next to the parking brake with strings (?) attached to both knob & lever. (I zoomed in). If you make it down to to the 580/680 split, I'm in Dublin/SR with a 1970 for reference.

Ah…I see it now. Thank you and I’ll give it a try this evening. Thanks Mud Gurus!
 
Joined
Feb 3, 2020
Messages
440
Location
Stanwood, WA
It's there right next to the parking brake with strings (?) attached to both knob & lever. (I zoomed in). If you make it down to to the 580/680 split, I'm in Dublin/SR with a 1970 for reference. While ours is not as nice as @Skreddy 's S.Green, but it's original and S.Green :)
Maybe not as shiny new, but I am envious of the original paint. Next one….
 

martymart

SILVER Star
Joined
Sep 26, 2007
Messages
219
Location
Inland Empire, Southern California
I have the 4wd lines and vacuum parts from under the dash, to the transfer case, and the 3 speed transfer case as well as the 3 speed transmission if you need any. I just changed to 4 speed on my FJ40. The vacuum line from under the dash, includes FD knob and cable, to the TC you can have for free if you pickup in SoCal. The other parts would be at a cost or trade. All working well. The transmission and tc had the bearings and seals changed, maybe around 1,500 miles ago.
 
Joined
Jan 14, 2012
Messages
740
Location
Vacaville, CA
I have the 4wd lines and vacuum parts from under the dash, to the transfer case, and the 3 speed transfer case as well as the 3 speed transmission if you need any. I just changed to 4 speed on my FJ40. The vacuum line from under the dash, includes FD knob and cable, to the TC you can have for free if you pickup in SoCal. The other parts would be at a cost or trade. All working well. The transmission and tc had the bearings and seals changed, maybe around 1,500 miles ago.
Nice! I’ll keep you posted. Came down with a bit of a flu or something…no, it s not Covid. I’m still required to be tested weekly.
 
Joined
Jan 14, 2012
Messages
740
Location
Vacaville, CA
Update: to confirm with the hubs locked and giving it the beans with the lever in the most forward position, the tires spun. The middle position is neutral for the t-case? Lastly the lever all the way out in 4-low…correct. I’ll be going the the SOR link provided to see if I have all the necessary parts this weekend.

Edit: when I mean the tires spun I meant the rear.
 
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