87comanche6994 Posted March 18, 2014 Share Posted March 18, 2014 so i was messing around in the truck today and took it out of 4wd and the light was on for a couple miles after i took it out of 4wd. I just purchased the truck so I'm not sure if something is wrong or not, everything works fine. any ideas? Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted March 18, 2014 Share Posted March 18, 2014 Drive straight backwards a few feet and see if it goes off. Link to comment Share on other sites More sharing options...
87comanche6994 Posted March 18, 2014 Author Share Posted March 18, 2014 Drive straight backwards a few feet and see if it goes off. i already tried that. no dice, i thought that was for people who had to manually lock their hubs? Link to comment Share on other sites More sharing options...
Blue88Comanche Posted March 18, 2014 Share Posted March 18, 2014 what year is your truck? Link to comment Share on other sites More sharing options...
87comanche6994 Posted March 18, 2014 Author Share Posted March 18, 2014 1987 Link to comment Share on other sites More sharing options...
Blue88Comanche Posted March 18, 2014 Share Posted March 18, 2014 I would check the Vacuum lines running from the transfer case to the CAD and the 4WD switch. If you wanted you can lock the cad so it is always locked. this way if you will have 4wd and not worry if the cad actually locked or not. I won't hurt anything to have it locked over, and in 89 or 90 they did away with the cad all together. EDIT: Here is the cad fix link http://comancheclub.com/topic/17377-cad-fix-1/ Link to comment Share on other sites More sharing options...
87comanche6994 Posted March 18, 2014 Author Share Posted March 18, 2014 I would check the Vacuum lines running from the transfer case to the CAD and the 4WD switch. If you wanted you can lock the cad so it is always locked. this way if you will have 4wd and not worry if the cad actually locked or not. I won't hurt anything to have it locked over, and in 89 or 90 they did away with the cad all together. EDIT: Here is the cad fix link http://comancheclub.com/topic/17377-cad-fix-1/ thanks for the reply! great information Link to comment Share on other sites More sharing options...
Jacob Ochs Posted March 18, 2014 Share Posted March 18, 2014 I've done the CAD fix and I didn't like it at all you have to have your front driveshaft balanced, new u joints, pretty much everything that has to do with 4wd. I had the same problem as you and I just replace the shift motor and re ran all vacuum lines from the transfer case to the shift motor and after that it worked. If you do the CAD fix your comanche will always have the front driveshaft spinning 2wd and 4wd so it makes your truck really unstable and shakey and a lot of vibration around 45-60 mph an it's very annoying I also experienced less gas mileage so don't do CAD. Go with re running the vacuum lines and keep the stock system. They make a vacuum line kit for the cherokee on amazon fro around 30$ that's your best bet! Link to comment Share on other sites More sharing options...
87comanche6994 Posted March 18, 2014 Author Share Posted March 18, 2014 I've done the CAD fix and I didn't like it at all you have to have your front driveshaft balanced, new u joints, pretty much everything that has to do with 4wd. I had the same problem as you and I just replace the shift motor and re ran all vacuum lines from the transfer case to the shift motor and after that it worked. If you do the CAD fix your comanche will always have the front driveshaft spinning 2wd and 4wd so it makes your truck really unstable and shakey and a lot of vibration around 45-60 mph an it's very annoying I also experienced less gas mileage so don't do CAD. Go with re running the vacuum lines and keep the stock system. They make a vacuum line kit for the cherokee on amazon fro around 30$ that's your best bet! thank you! ill check amazon now. Link to comment Share on other sites More sharing options...
Jacob Ochs Posted March 18, 2014 Share Posted March 18, 2014 No problem!! Link to comment Share on other sites More sharing options...
shelbyluvv Posted March 18, 2014 Share Posted March 18, 2014 If you had that bad of a vibration you needed to rebuild your shaft anyhow. The CAD was done away with in later years because it is a crappy design. It will only take one time for it not to work when you need it most, when you will be kicking yourself for not deleting it. Just think if you dive head first into a hole thinking your front axle is locked in. You get about rocker deep and all of a sudden you realize you are nothing more than a 2WD truck and you're now stuck. You will have to get pulled out, winch yourself out, or go SCUBA diving to fix your none working CAD. I always lock them over because that has happened to me. Now I never, ever wheel alone. Link to comment Share on other sites More sharing options...
Blue88Comanche Posted March 18, 2014 Share Posted March 18, 2014 I've done the CAD fix and I didn't like it at all you have to have your front driveshaft balanced, new u joints, pretty much everything that has to do with 4wd. I had the same problem as you and I just replace the shift motor and re ran all vacuum lines from the transfer case to the shift motor and after that it worked. If you do the CAD fix your comanche will always have the front driveshaft spinning 2wd and 4wd so it makes your truck really unstable and shakey and a lot of vibration around 45-60 mph an it's very annoying I also experienced less gas mileage so don't do CAD. Go with re running the vacuum lines and keep the stock system. They make a vacuum line kit for the cherokee on amazon fro around 30$ that's your best bet! The front drive shafts are balanced, the 4wd system is rated at normal road speeds. my cad has been locked for a while before i swapped to a Non-CAD HP D30, I know not of the issues you where having. even with the front drive shaft removed i did not notice a difference. Link to comment Share on other sites More sharing options...
48MJ Posted March 18, 2014 Share Posted March 18, 2014 I've locked the disconnect on 2 Comanches and never had any issues. They discontinued the disconnect later on all of them. But if you have bad u-joints I'd recommend replacing them anyway. That way they won't go out on the trail or the highway and cause more damage. Just my two cents. Link to comment Share on other sites More sharing options...
dscowell Posted March 18, 2014 Share Posted March 18, 2014 Mine does the same thing periodically putting it into 4wd and driving a couple feet then taking it out usually does the trick Link to comment Share on other sites More sharing options...
carnuck Posted March 20, 2014 Share Posted March 20, 2014 If it's actually going into 2wd but the light is staying on the switch could be sticky on the tcase. Often that is also a sign of the tcase being low on fluid so I would pull the fill plug on the back and top it off. Since they only take a couple quarts, I usually go with the synthetic fluid. You could switch the front axle to a cable operated Posi-lock style. Link to comment Share on other sites More sharing options...
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