Cmbechtold Posted May 9, 2014 Share Posted May 9, 2014 After putting on lift I drove down the street it has a very slight almost shutter can't figure out what it is everything is tight Link to comment Share on other sites More sharing options...
Incommando Posted May 9, 2014 Share Posted May 9, 2014 tires? track bar mount on drivers side? I would start with re-torquing everything. Link to comment Share on other sites More sharing options...
Eagle Posted May 9, 2014 Share Posted May 9, 2014 A shutter is what's behind the lens of a camera. What's the problem you are having with your Comanche? How tall is the lift, and have you done an alignment after installing the lift? Link to comment Share on other sites More sharing options...
dasbulliwagen Posted May 9, 2014 Share Posted May 9, 2014 I agree with the alignment. But with that also check caster angle. If there is too little it will make a wobble more likely to happen. Spec is 6.5-7.5 degrees positive. The adjustment will be at the rear of the lower control arms. Good luck. Link to comment Share on other sites More sharing options...
Cmbechtold Posted May 10, 2014 Author Share Posted May 10, 2014 Have not done a alignment yet but I don't think it's that it is almost like a u joint feeling a vibration at 15 mph and above and it is a 4.5 lift and it didn't have this problem before so it's gotta be something with the lift Link to comment Share on other sites More sharing options...
dasbulliwagen Posted May 10, 2014 Share Posted May 10, 2014 If you have not had an alignment after that much lift your toe setting is going to be way off and your caster angle will have changed. I'm sure your old u joints are feeling the pain as well. They don't like changing angles after being in one spot for a long time either. Change your u joints and DO an alignment. Your steering wheel probably isn't centered anymore and your front tires will start wearing badly. This is a must do. Link to comment Share on other sites More sharing options...
Eagle Posted May 10, 2014 Share Posted May 10, 2014 I agree with the alignment. But with that also check caster angle. Caster is part of alignment. Link to comment Share on other sites More sharing options...
Eagle Posted May 10, 2014 Share Posted May 10, 2014 Have not done a alignment yet but I don't think it's that it is almost like a u joint feeling a vibration at 15 mph and above and it is a 4.5 lift and it didn't have this problem before so it's gotta be something with the lift Take out your front drive shaft and drive it again. U-joints don't like changes to their operating angle. Your lift may have changed the angle on your front u-joint enough to induce a vibration. Link to comment Share on other sites More sharing options...
92tanMJ Posted May 11, 2014 Share Posted May 11, 2014 90% of the time it is the track bar/track bar bushing. At what speed does it happen? Does it happen every time? And does it need something like a bump to 'start it'? Also can you please post a picture of your steering? (straight on from the front) At 4.5"I would lean towards guessing it's the rear DV vibrating.. But thats normally not an issues on the older models.. but his lift could be more than 4.5 Link to comment Share on other sites More sharing options...
dasbulliwagen Posted May 12, 2014 Share Posted May 12, 2014 I mentioned to make sure about the caster adjustment because it is usually overlooked when doing an alignment because it is not a tire wear issue. Most shops you go to will do a toe and go. And most guys doing a quick lift don't think about it either. This is one that needs mentioning and adjusted. Especially on our trucks. Link to comment Share on other sites More sharing options...
Cmbechtold Posted May 13, 2014 Author Share Posted May 13, 2014 ok guys Ive made sure everything is tightened and its getting aligned thursday just thought I would post pics to see if any of you guys can tell what might be causing vibration at 20mph Let me know what you spot thanks guys. Link to comment Share on other sites More sharing options...
Cmbechtold Posted May 14, 2014 Author Share Posted May 14, 2014 Anybody? Link to comment Share on other sites More sharing options...
yxmj Posted May 14, 2014 Share Posted May 14, 2014 Pic are nice answer one Question are the rims and tires balanced? Link to comment Share on other sites More sharing options...
Cmbechtold Posted May 14, 2014 Author Share Posted May 14, 2014 Yes Link to comment Share on other sites More sharing options...
yxmj Posted May 14, 2014 Share Posted May 14, 2014 As you drive can you narrow the vibe down,,,,,front or back???? my next guess is control arm bushings........ :dunno: Link to comment Share on other sites More sharing options...
Cmbechtold Posted May 14, 2014 Author Share Posted May 14, 2014 Kind hard to tell but if I had to guess I would say closer to the front And it has brand control Arms how could it be the bushings? Link to comment Share on other sites More sharing options...
Eagle Posted May 14, 2014 Share Posted May 14, 2014 Rear drive shaft u-joint angles. All wrong. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 14, 2014 Share Posted May 14, 2014 Rear drive shaft u-joint angles. All wrong. Agree. No way the rear diff pinion should be pointed up that much unless you are using wedges or something. It's like the leaf spring center bolt isn't in the lower plate hole and the axle is rotated upwards so the pinion is "looking at" the tcase output. Looks like it's set up for a CV drive shaft. Might be your pic angle, but the below is the proper geometry your drive shaft should be at. This is where you are. Link to comment Share on other sites More sharing options...
Cmbechtold Posted May 14, 2014 Author Share Posted May 14, 2014 It is tilted the problem is that it is in the center bolt I'm positive I knew it didn't look right with the axle tilted that far but I don't know what will fix it or why it is that far back Link to comment Share on other sites More sharing options...
Cmbechtold Posted May 14, 2014 Author Share Posted May 14, 2014 This is probably a dumb question but how does that cause a vibration it's fairly even where the driveshaft connects on both sides so why would that cause vibration? Link to comment Share on other sites More sharing options...
Eagle Posted May 14, 2014 Share Posted May 14, 2014 The two u-joints on a drive shaft have operate "in phase" or they set up a vibration. To be in phase, the two u-joint angles have to be the same (within about a degree or so). Look at the diagram Don posted -- the angle of the mainshaft through the transfer case is parallel to the angle of the pinion shaft in the differential. That makes the two u-joint operating angles equal and opposite, so any vibration gets cancelled out. Link to comment Share on other sites More sharing options...
Rockfrog Posted May 14, 2014 Share Posted May 14, 2014 Rear pinion is too high ... front pinion is too low ... the rear will cause a vibe itself, the front even more so ... The rear angles should be equal as the info posted above shows. With a 1 to 2 degree down angle. The front pinion should be pointed directly at front output yoke with a 1 degree up angle. Fix those issues and you will kill your wobble. Link to comment Share on other sites More sharing options...
dasbulliwagen Posted May 14, 2014 Share Posted May 14, 2014 You should remove the transfer case drop as well when you re setting all your driveline angles. The MJ does not need these. They might make the rear driveshaft angles better when applied correctly, but they always make the front angles worse. Link to comment Share on other sites More sharing options...
Cmbechtold Posted May 14, 2014 Author Share Posted May 14, 2014 So how would I fix the angle u can't really just adjust those should I get shims ? Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 14, 2014 Share Posted May 14, 2014 Are those blocks between the axle and the leaf springs? And what's up with those springs? AAL's? Link to comment Share on other sites More sharing options...
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