Need help w/ '94 Dodge 4WD

John Saeli

Well-known Member
I know this is a CASE forum, but technically, Fiat now owns CASE & Chrysler. Anyways, without any warning, or noise, I have no front wheel drive. Sitting still on ice, in 4WD, rear wheel spinning, front drive shaft also turning, but no output to either front wheel. Does not have "Lock-Out" hubs. Neither outboard U-Joint on the front axle is turning. Any ideas what could have happened?
 
Vacuum switch on transfer case locks axles together. Ck for vacuum at motor or pod on front axle. Does 4wd light come on at dash. Could have ice in vacuum line.Have seen bad splines on axle,bad vacuum motor just need to ck it.
 
No. the 4WD lite was not on. Had no idea it could be something as simple as vacuum related. Used 4WD, then shifted into 2H to go on the road, got off the road, shifted back into 4WD, & nothing. Thank you for the heads up!!
 

I had the same issue with my 97. If you has cruise control the module is under the driver side battery, and there is a vacuum line that runs under it, battery discharge drips down on the line and makes it brittle, erodes it there. I finally found it and replaced that line, 4WD and Cruise worked again!
 
In a pinch you can switch the 2 vacuum lines on the front axle. When you get REALLY DESPERATE, you take the 4 bolts out, slide the collar over and score the shaft with a chisel. Last resort, and you ruin the axle shaft.
 
My '96 2500 w/V-10, NP-4500 I managed to pull one of the vacuum lines off the switch on the shifter at the xfer case. Also no FWD and it wouldn't pull in sand for nothing but my M-670 retrieved it.
Bryce
 
The vacuum failure to engage the front differential is not compunction. My 95 GMC had the same issue. it apparently was a widespread problem as there was an after market kit that replaced the vacuum with a pull cable mounted to the dash board. I have it on mine as the vacuum frequently failed to engage.
 

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