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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 98.5-02 24V Forums > 98.5-02 Powertrain
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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Old 01-23-2013, 01:49 AM   #1 (permalink)
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4wd questions

So it goes into gear either 4 hi or 4 low but the front wheels aren't grabbing at all. Not sure where to start.. Any suggestions
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Old 01-23-2013, 09:06 AM   #2 (permalink)
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Your truck has a central axle disconnect.
It is vacuum operated. Check those vac lines.
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Old 01-23-2013, 09:07 AM   #3 (permalink)
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start by checking your vacuum system, the line coming off the vacuum pump is a common problem, check all lines, and ends. good place to start.
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Old 01-23-2013, 10:25 AM   #4 (permalink)
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I agree with the guys above. Does your cruise control work as it should? Does your HVAC blow out of the vents?
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Old 01-23-2013, 10:29 AM   #5 (permalink)
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alot of times it is the switch inside the t-case. Pull the vacuum lines off the cad on the front axle. There is a red one and a black one. while in 2wd it puts vacuum on one side and in 4wd it puts vacuum on the other. (i forget what color is for 2wd and which for 4wd). Have a buddy in the cab with truck running go under with a vacuum gauge and check each while he shifts from 2wd to 4wd. The truck needs to be running, and yes it is stupid friggen loud under there.
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Old 01-23-2013, 10:30 AM   #6 (permalink)
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4wd questions

I had the same problem also and if all your vacuum lines check out its most likely the 4wd actuator on the front axle. Not too expensive or hard to replace I bought mine from geno's garage. My actuator got stuck in the 4wd position.


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Old 01-23-2013, 10:39 AM   #7 (permalink)
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or you can make your own posi lock for like under $50. That is what most do. The nice thing about that is you can have 2lo for spotting trailers.
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Old 01-23-2013, 10:56 AM   #8 (permalink)
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Here is more on the CAD system...
Mopar1973Man's Dodge Cummins Articles - Central Axle Disconnect (CAD) System Troubleshooting
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Old 01-23-2013, 04:14 PM   #9 (permalink)
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The rod in my 4wd actuator was getting jammed in the case in the front axle. I disassembled it all, cleaned it and drilled the guide hole out a bit. Put it all back together and it is working great again. The seals in my actuator are bad without a doubt, but this has given me a little more light out of the 4wd. I will just do a manual setup at some point here.

Check vacuum lines first as stated above.
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Old 01-28-2013, 09:09 PM   #10 (permalink)
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i have a question, probably a stupid ? but if there was a ac delete done on my truck should i block off the line going to my hvac supply?
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Old 01-28-2013, 09:59 PM   #11 (permalink)
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I can't believe how many people with 01s don't consult with the FSM 1st. Also am amazed how many times Mopar responds with good info.
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Old 01-29-2013, 07:23 PM   #12 (permalink)
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Quote:
Originally Posted by bucked_up View Post
i have a question, probably a stupid ? but if there was a ac delete done on my truck should i block off the line going to my hvac supply?
yes
123456
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