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Does Anyone Know What The 4Wd Check Valve Is?


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Hello I am having problems with my 4wd. I'm gonna have to replace all vacuum lines and I wanted to know what the check valve is an where I could get a new one?

Still resisting the CAD elimination, I see.................

I did the CAD fix and I noticed it made the front driveshaft spinning and it wa vibe rating badly and I got less gas mileage so I decided to stick with the vacuum system
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Hello I am having problems with my 4wd. I'm gonna have to replace all vacuum lines and I wanted to know what the check valve is an where I could get a new one?

Still resisting the CAD elimination, I see.................

 

I did the CAD fix and I noticed it made the front driveshaft spinning and it wa vibe rating badly and I got less gas mileage so I decided to stick with the vacuum system

 

Too soon to say it affected the mileage. I've never noticed a difference. And, if the factory was gonna lose MPGs they never woulda done it .Any vibes indicate an issue with the shaft, not the fix. 

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What could be wrong with the shaft?

Out of balance.

 

More likely, the slip joint may be worn out. That was the problem with the 2001 XJ I bought (which doesn't have a CAD, by the way). I had a horrible vibration that started acting up around 50 MPH and got worse as the speed increased. I could crawl under the front, grab the aft end of the front yoke, and both see and feel significant angular movement when shaking the yoke (slip joint) side-to-side. I tossed in a junkyard front driveshaft and it pretty much cured it -- enough to get me through the winter, anyway.

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What could be wrong with the shaft?

Out of balance.More likely, the slip joint may be worn out. That was the problem with the 2001 XJ I bought (which doesn't have a CAD, by the way). I had a horrible vibration that started acting up around 50 MPH and got worse as the speed increased. I could crawl under the front, grab the aft end of the front yoke, and both see and feel significant angular movement when shaking the yoke (slip joint) side-to-side. I tossed in a junkyard front driveshaft and it pretty much cured it -- enough to get me through the winter, anyway.

Oh wow. I've never seen that happen. :-\ Does that come with hard use, or are there better or worse shafts that one has to look for?

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