CAD 4x4: - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 07-29-2013, 03:31 PM   #1
Jeeper
 
Defcon 1's Avatar
 
Join Date: Jun 2012
Location: South New Jersey
Posts: 814
CAD 4x4:

Quick question,

On the front axle CAD diaphragm there are 2 vacuum lines that plug into the side of it. When the t-case shifter is in 4wd, (high or low), does than mean there should be vacuum on -both- lines? Or is vacuum applied to both lines when it's on 2wd?

Trying to figure out why my CAD fork won't go back to the 2wd position, the fork is all the way left and hits the indicator switch, so the light is on all the time even when I'm not in 4wd. I think it's either a vacuum line problem, the t-case vacuum switch, or the fork is jammed up.

I know all about the posi-lok by the way, if I can't isolate the problem ill upgrade to that.

Defcon 1 is offline   Quote
Old 07-29-2013, 03:46 PM   #2
Jeeper
 
Redrider94's Avatar
 
Join Date: Aug 2010
Posts: 661
Vacuum should pull the fork to the left when in 4x4, and to the right when in 2x4. So you should only have vacuum on one line at a time.

Redrider94 is offline   Quote
Old 07-29-2013, 03:48 PM   #3
Jeeper
 
OverkillYJ's Avatar
 
Join Date: Jun 2012
Location: Philadelphia, PA
Posts: 2,904
The vacuum switches sides when you hit the lever. It goes from one side to the other causing the shift fork to slide over. There are two styles of lights though. One style is on the CAD, and actually unscrews from it. You will see two wires if that is what you have, with a sensor that looks just like a reverse light sensor on a transmission. If your CAD is stuck it could make the light stick on. The other style from earlier YJs is on the firewall. I have not worked on those. I believe it is after 92 they were on the CAD itself. My CAD failed, and for less cash then a posi cable I swapped in a solid axle. Then you can put a sensor from a Cherokee on your TC for the light to keep working when you shift in and out of 4X4.
__________________
Complete rebuild axle/engine/everything swap in progress:
Parts already gathered for assembly: 2001 Ford 302, 1990 Mustang GT 5.0 ECU and wiring, NP435, NP205, Pair of axles from 04' F350 SuperDuty (Sterling 10.5 Posi rear, Dana 60HP Front-Both Disk Brakes 3.73 Gears), 37" H1 Tires, 9" lift TJ Coils for 2 link conversion in front, Stage 2 Clutch Kit, 3 Row Aluminum Radiator, Chevy Astro Steering box (4" front Stretch), XJ Rear Leaf Springs (6" Rear Stretch), and lots more.
OverkillYJ is offline   Quote
Old 07-29-2013, 11:25 PM   #4
Jeeper
 
Defcon 1's Avatar
 
Join Date: Jun 2012
Location: South New Jersey
Posts: 814
Thanks ill pull those vac hoses off when it's running and see which one is/isn't working. Then I'll go from there. I have the kind of indicator switch that's on the CAD, it has a plunger that makes contact with the fork when the fork moves left and engages the 4wd. I already checked out that indicator switch to make sure it was working correctly, and it looks like the fork is stuck in the engaged position from the view hole, haven't actually taken the CAD cover off yet to see but I'm going for the t-case switch first to see if that is actually working.
Defcon 1 is offline   Quote
Old 08-05-2013, 10:45 PM   #5
Jeeper
 
Defcon 1's Avatar
 
Join Date: Jun 2012
Location: South New Jersey
Posts: 814
Quote:
Originally Posted by OverkillYJ View Post
The vacuum switches sides when you hit the lever. It goes from one side to the other causing the shift fork to slide over.
Ok, so I pulled the vac lines off the CAD and tested the vacuum. I got vacuum on the one line in 2wd, and when I put it in 4wd, the vacuum was still on the same line, it didn't transfer over to the other line. Does that mean my T-case switch is shot?
Defcon 1 is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 03:55 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC