Go topless 87
New member
Hey I've got an 87 and when I put it in 4wd the front shaft goes around but the front wheels don't go around. Any idea what's wrong wit it. I've got vacum operated 4wd. Any idea?
4wd
- Thread starter Go topless 87
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Gennybro
Active member
check under your battery for a possible hole in your vacume line,what has been known to happen is that the acid from your battery gets on the hose and eats a hole in it. If I was you I would get the posi loc system,and do away with the vacume system. It is a cable that runs from inside your jeep to the actuator that engages your 4 wheel drive. Which is located on the passanger side of your jeep,on the back side of your axle.It is a small square box. Inside that box is a fork that slides a ring that engages your front axle,that may aalso be the origen of your problem,the fork could be wore out,and not able to slide the ring to engage the front . Quadra tec has the posi loc. Good luck.
Go topless 87
New member
Yeah. I've seen the posiloc system. That's what Ima do if I can't fix it. I'll check those lines.
Go topless 87
New member
I'm new to having a jeep. So just go get tj axles and swap out. Do I need to replace anything else?
Robert_Stephens
New member
I had a new YJ, tan, in 1990. I and my new bride (deceased) took off from NASA-KSC in Forida, up to Montana, my folks place. No probs. After 4 months, I developed so much vacuum issues and the issues with the 2nd gen SSI (Solid State Ignition-Computer) and finally, sent the Jeep to auction in Spokane.
No more of that.
So, trace out the lines, test for leaks, then, strip out the whole mess and go with a used points and condenser Iginition for about $50 and call it good....
Just a thought,
Robert
No more of that.
So, trace out the lines, test for leaks, then, strip out the whole mess and go with a used points and condenser Iginition for about $50 and call it good....
Just a thought,
Robert
jakec
New member
to put in tj axles you need to get a different seal thats the same diameter of the tj shaft. the short side goes in with no changes but the disconnect side is way bigger so the old seal wont work. i just took all that disconnect crap off and put the collar where it is engaged all the time and put 2 big tywraps on each side to hold it in place and its been working fine for 7 or 8 months now and only cost 50cents. no seal replacement either. my buddy has had his like that for 2 years with no problem.
Robert_Stephens
New member
Something is bent or you have a U-joint fail. VEX and all other Jeeps when things are sound and hubs in, especially if you have CV joints at the TC, should ride and drive as smooth as a car at all speeds.
Robert
Bounty__Hunter
Super Moderator
You can also remove the disconnect from the axle, engage the shift collar, and reinstall the disconnect upside down. The shift fork will now hold the shift collar engaged. It's safe to run like this all the time.
Go topless 87
New member
Thanks for all the advise. I will definetly try it before I buy a 200 dollar posi loc.
Gennybro
Active member
I suggested the posi loc cause actually I dont know much better,I bought my jeep with the posi loc already on it.after joining this forum,I came to believe that it is a better set up then the vacum system. When I started useing the posi loc I wasn't to impressed with the way it engauged,and thought there has got to be a better way,but havent done any research in that area yet . When permanetly locking in the front end with the drive shaft turning,wouldnt that effect power and mpg,espically for a 4 cyl,which is what I have.
Bounty__Hunter
Super Moderator
Not enough to notice.
jfrabat
New member
I run TJ alloy axles up front, which means my front DS is always turning. No issues with power loss and mpg have come up yet (over 2 years), and I drive a 600 mile roadtrip every 3 months (from Panama City, Panama to San Jose, Costa Rica).
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