1994-2002 Dodge Ram 2500 4WD Troubleshooting. My Way.....
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- เผยแพร่เมื่อ 25 ก.ย. 2020
- Hey Everyone, just wanted to take a minute and do a little write up on why i explained this video the way i did.
This Dodge CAD system is a simple system but like anything there is a lot of stuff that can go wrong that you overlook. I explained this video this way because these are all troublesome areas i have encountered. Sure for the guys that know this system well are going man this guy is all over the map explaining... Here is why i did it the way i did. For one i could have started out saying go to the centre axle disconnect and feel for vacuum down each line. If there is some on one line but does not switch when shifted to 4WD replace the vacuum switch. If there is vacuum that switches when 4wd is engaged but no 4wd light on the dash then replace the Centre Axle Disconnect. In a perfect system that would be an ideal diagnosis and this would be a very simple and easy 5 minute video explaining it and diagnosing it. However with all these trucks being around 25 years old a lot of factor's come into play with everything being aged with stuff being rusty, plugged, swollen rubber, collapsed lines etc. there is endless little stuff to look at. That is why i explained everything the way i did and i hope you can pin point your 4WD issue with this video. The camera was being stubborn and i know i had it all over the map but i feel for educational purposes since i got the camera into these hard to reach area's it will make diagnosing easier for you. Josh
If you have vacuum to your axle and the vacuum is switching fine between lines this will likely be your issue:
www.genosgarage.com/product/d...
If you have vacuum on one line at the front axle and it does not switch when 4x4 is engaged this is likely your issue:
www.genosgarage.com/product/d...
If you have vacuum to the switch and it is switching but vacuum is weak coming out but strong going in to the switch you will likely need this:
98-01 trucks : www.genosgarage.com/product/d...
94-97 trucks: www.genosgarage.com/product/d...
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Excellent video. I was stuck in the snow with a 99 ram 2500...not stuck anymore!
I've watched numerous videos and when I say numerous 30+. This was the best explanation on a vacuum system. I'm not a mechanic but I try to fix things myself. I'm in construction, contracting. Thanks for taking the time out and sharing this video. AWESOME JOB.
Awesome video. My 4x4 stopped working and I was able to locate and fix the problem within an hour after watching this video. Thank you.
Lyle thanks so much for the nice comment. I make these videos so I can hopefully help others. Some hack my diagnostics and others understand and click with me. I’m glad we “work together” the same way! Enjoy the 4x4.
Josh
Very helpful in troubleshooting my issue. I watched a bunch of similar videos and yours is hands down the clearest and best presentation. Thanks much!
Thank you so much for the clear and concise video. You have the gift of teaching my friend.
Thank you for making this video man, it was a huge help in getting my 4wd & cruise control fixed, turned out it was just the main vacuum line was no good, got around 2 1/2 feet of some new line for less then a dollar at the auto parts store (guy gave it to me for free) you earned a new subscriber.
Glad i helped! Thank you for the comment!
Also you can pull off the indicator light switch which is the gizmo at 6:10 on the left with the two wires sticking out. Take it off and attach an ohm meter to the pins then depress the plunger. It should close the circuit and trip the ohm meter. This is what lights your dash 4WD lamp. Could be your 4WD is fine and you just don't have a working lamp. Great video!
Fixed my 4wd in 5 min , thanks for the easy video.
Thanks for the vid i had a problem with mine and after watching this i realized i had two vacuum lines disconnected.
Thank you for this very helpful video. I have a vacuum leak on my 95 4x4. Keep up the great videos.
Hi again, just want to say thnx to you I have 4X4 working again! CHEERS.
Perfect video! Exactly what I needed! Didn’t waist a min. Thanks a bunch
Awesome video, helped me fix my 4WD! The black tube was cut right in half near the front axle, super easy fix. Thanks!
Your video helped me a lot. Much appreciation
Great video, helped alot and you did better than alot of guys explaining everything. Simple system to me know once you explained it. Many thanks
Thanks, really helped my dad out in identifying the issues.
Excellent video, best video I have seen yet very well done thank you
Thank you Bruce. Glad it helped.
You’re the man. Great run down. Subscribing.
Thanks Lucas. I appreciate the sub.
That was fantastic seem to be very thorough thank you
Awesome explanation!
Look forward to hearing from you, CHEERS !
Great video thanks for the walk through
Best troubleshooting video out there. Damn good mechanic
Nicest comment i have gotten in a long time. Thank you very much!
Thanks very well explained you sure do other videos about transmission failures.
Great video! Thanks
Good presentation best I've seen
Good walk through, I didn't need the new vacuum harness after I bought it, replacing the vacuum diaphragm did the trick, she went in 4x4 right away. Only question I have is, when I pulled floor lever it went in right away, and dash light also comes on now.
When I take it out of 4x4 the dash light wouldn't go out until about a block down the road, even though the front end disengaged the light stayed on that long.
So I just put in a new light indicator on the axle housing and it does the same thing. It's been several years sense the light worked, just can't remember it taking that long to go off.
Doesn't matter, putting her up for sale now that I fixed that, I'll just let the new owner know.
If 4x4 shifter is in 2wd the light will only go out once the front actuator moves. Can take some time to pop out sometimes.
When changing back to 2wd just back up a little bit and then go forward that's how I get mine to disengage good and light will go off. Hope this helps
Those metal vacuum lines always rust out. Mine were completely missing on an old plow truck I bought. I had a donor truck to grab the lines off of but when those fail I plan on using 3/16th brake tubing with a double flare to hold the vac lines onto them, bend as needed to fit your truck/needs. I suggest painting the brake lines with frame paint which will not allow RUST to ever be an issue again, trust me! Good luck. Ty for the video and information I needed to figure out my vacummline routing and color codes, to a point! ha.
Great video man keep up the great work
Thanks Martin! Appreciate it
@@Schneids15 no problem
Thanks for the great vid.
Informative video thanks
Excellent Video!!
Muy bueno, no andaba la luz de tablero de la 4x4 y era la manquera de vacio de arriba del filtro de gasoil desconetada. Gracias Buenos Aires Argentina
Awesome video….!!
Hey thnx so much! Heading the dealer😊
Thank you so much!!!!!!!!
Gracias buen video.
Fantastic info, see your Cummins is from Arthur Chrysler.
Yes it is!
Hello, not sure if you will get this since it’s an older video, but do I have to use those hard lines? Or can I just use regular vacuum line hose? Those pre formed hard lines are hard to find.
can you show me or explain how thr front abs system is connected on a 1994 2500 dodge long bed v10
Thank you.
Great video ! I have a 98 Dodge 2500 Cummins and Im not sure where the round unit that connects the stub and main axle together, where would it sit in 2wd ? Closest to passenger side or driver side? thanks !!!
Is the switch youre referring to for replacing the one on top of the transfer case with the 4 vaccum ports?
Thanks 🙏🏻
My heater control didn’t work it was a broken vacuum line by master cylinder all fixed. My 4x4 didn’t work axle actuator and all lines were shot. Made new out of copper brake line got new rubber lines, also took switch off of t case ran kroon rust proof through it blew it out got rust out of it and now system works flawless
If I can get into 4WD high but not low…. Could lack of vacuum be the cause?
So the vacuum in the engine bay (98 12 valve cummins). Is the vacuum hose hooked onto what looks like a silver box on the driver's side of the engine bay?
I found a hose coming off of that, just chilling loose in the engine bay, that was pulling air/had vacuum feel/ from the hose itself. Only one hose was on the T at the back of the engine bay where two hoses you say come up - could this loose hose have been the one that's supposed to hook in on the left?
Hey , this sound’s different to mine as i had a 24V. Can’t see what the silver box would be. Is it in the firewall?
I have vaccumm at that diaphragm idk how much iam suppose to have but still don’t have 4 wheel drive and replaced diaphragm
Hi. Great video! can you tell me which direction to put the rubber plug on the vacuum line switch, please? I took it off like you said and am not sure which direction to replace it. Thanks!!
No problem. It will only go on one way. There is a tit that prevents it from going on wrong.
Beautiful
Thank you!
I’ve literally been fighting my 4x4 all winter. I was about to order a full cad delete with solid axle shaft. And then I was gonna do the posi lock switch. But I think it’s best to just keep it factory since it’s my daily driver. I’m gonna diagnose it tomorrow!
I have had all those thoughts. The factory system is simple and has lasted this long. I like keeping stuff factory so i learned how the system worked...
Hi there, picked up the vacuum harness today, put it in but have extra short hose on top of the transfer can’t see where it goes?I see the same short piece in your video. But didn’t see where it routes to? Or would it be a vent? Thnx in advance.
You got me thinking. I want to say there is a nipple on top of the t case it attaches to.
So same with neutral with transfer case?
Hey Just came across your video tutorial. I’m looking at a 2002 Dodge 2500 4x4 , gas engine with 80,000 miles. What if any issues with these year trucks whatever small or big issues ? Truck looks very clean no rust , excellent video. Thank you for any assistance
Hey Joseph, as far as the diesels i could give you some tips. With the gas trucks the steering is the biggest issue. The trac bar’s are a bad design. There are several options to choose from to fix them.
Hi. Could you help me out with part numbers or size line I need to replace vacuum lines from pump - brakes - hvac? 1996 12 valve 5 speed 4x4. Thank you.
Hey sorry, been so long i can’t remember. I think about 1/4”
I have a weird issue with mine (91 W150 241D case). My xfer case goes into 4H all the way forward where 2H is, and I pull back a notch and it's in 2H. 4wd light comes on all the way fwd too. Light also comes on in N and goes out if I drop to 4L...and pops out of 2L when I put it in gear. I readjusted the linkage, but wonder if my vacuum lines might be installed backwards. Previous owner had a shade tree mechanic who did some transmission work and it hasn't been right since.
I would have to see how that works. As far as i’m concerned on the older 4wd stuff do you not have locking hubs? Or was that 250 and up?
@@Schneids15 It's not locking hubs for me. However, I was going to get back with this post anyway...I went out and swapped the vacuum lines on my 4wd light switch vacuum pump up front, and it fixed it after all. Instead of a two plug connector like you have, mine was two separate vacuum lines, so I popped them off and swapped them around. Now 2H is up top, then 4H with light, N. and 2L with light...like it should be. Thanks to your video it helped me figure out what to look for.
That is great. I was going to say it sounded like you had it pinpointed that it was backwards by the way you described. I’m glad you got it figured! Enjoy the old girl.
Hey I recently replaced all the u joints in my front drive shaft along with all the vacuumed lines. I shifted my truck into 4H and everything seemed to work fine. I took the truck out for a drive in 2W and about 5 miles down the road my front axle started squealing. It seems as if the passenger side hub is staying locked. Any possible reasons as to why this could be happening?
Is the 4wd light on? If so vacuum lines could be backwards.
Hi, spoke with you before. Have this problem. Where did you purchase the kit you have in your video? Is it still available? Thnx so much in advance. You help many RAM GUYS ! I’m near Cayuga.
Hey! Oh right on i know where you are! It’s a dealer only part. Call them and tell them you want the vacuum harness that attaches to the top of the transfer case. They will hook you up.
The middle link is not working do you have Part number if the item thank you
Whats that other hose next to the 4port vacuum on top of the transfer case?
I’d have to check but 99% sure it is just a vent.
P/S mine is a 94 would it be different?
What would stop a guy from just running a line from the pump to the corresponding nipple on the fork thing on the front axle? (And then disconnecting when you don't need 4wd)
Nothing would stop you😁 It would work yes!
My switch messed up a couple times on the t case. I would go down and flip the vacuum lines backwards on the shift fork to make it come out of 4x4.
Looking at your old lines near the putty can on the bench there’s a line pointing to the right where does it go? We can’t where to connect it?
Yes. The short line to the right. Okay so put the rubber plug on the top of the vaccum switch on the transfer case. Feel around near the plug and you will feel a fitting 90 degree barb coming out of the transfer case. That is where it goes. Go to about 3:08 or so in the video and look and you will see it attached beside the vacuum switch.
Sorry actually 3:50 in the video.
Thanx much. Very helpful.
Is it ok to manually change 4h to 2h from underneath the shifter lever? my truck was stuck in 4h and the lever on the floor board " slipping / loose" on the connector pieces / joint. I believe its in 2h now no indicator light on the dash.
Yes i don’t see why not. It is doing the same job like you are saying, you are still shifting but there is a problem with the lever?
@@Schneids15 the lever on the floor is slipping when trying to engage 4h gears
Thanks for helping
That's the fuckinh way to explain I was looking for videos about transmission problem reverse wont work on my 1995 dodge ram diesel 2500 it works only forward.
Good video but my shifter is free floating. Like bounces out of 4x4 or can’t feel in engage. And could fall all the way into 4lo spot
I have a transfer case video. Sounds like a detent ball could have went internally. First though there is a problematic c clip on the back of the transfer case that fails and causes the issue you are having i believe. I have heard of guys when they fail having to hold there shifter in one spot to get home.
On mine the mech shop just rebuilt my tranny and now the 4wd drive light comes on in 2 wheel and then turns off in 4 wheel. Is this plug easily plugged back in backwards? Or do you think they switched up a vacuum line? Great video!
Hey Vincent! I can guarantee they have the vacuum lines backwards. Go to the front of the skid plate/ cross member under the truck and you will see where there is 2 lines that run from rubber to steel. Switch them there, just yank the rubber off the end of the steel line and reverse them and you should be golden
How much vacuum at the actuator? It it regulated or direct.?
Direct. I’d have to look at the specs again. 15 inches or something like that of vacuum.
Dude you're so fucking dope. Thank you
I’m currently stuck in a snow bank on the side of the interstate because my 4x4 won’t engage in my 01 lol
Did you get out?
My issue is the 4WD light is always on, and the front driveshaft is spinning in 2H. What could this be??
If t case is disengaged manually but the light is on, the light is controlled by your centre axle disconnect. Likely the unit has failed and needs replaced. There is a diaphragm kit you can get. The front shaft spins because your axle is spinning and it is locked too it.
@@Schneids15 Can the front driveshaft constantly spinning wear the Tcase out or is it not a big deal?
Where’s the in depth video on the system?
There is another video. I believe it is in my cummins playlist. If not i will try and add it for you.
My truck wont engage into 4wd. It grinds while I try to engage it. Can this be the problem?
such on each other 🤣😂