The photo in my original post shows this. I suspect after Dave installed a DC driveshaft the front bit is not there in my Jeep. @Chris this is what I was trying to tell over in our messages.
Harmonic vibrations in Jeeps: A new theory (please read!)
- Thread starter psrivats
- Start date
The photo in my original post shows this. I suspect after Dave installed a DC driveshaft the front bit is not there in my Jeep. @Chris this is what I was trying to tell over in our messages.
Installing an SYE on a 231 requires replacing the rear output shaft, the new one doesn't have any provision for a balancer.
Stox5225
TJ Enthusiast
Oh brother. Now I want to find his vibration thread and read it. Do you remember his screen name?
I cannot live with that vibration. I would rather go back to 4.10 gears and get rid of my lift and do a highline to fit the bigger tires.
UnlimitedLJ over on JF never resolved his vibes either to my knowledge, and he seemed to be a pretty smart cookie with Wranglers.
I'm going to put a small crink in the balancer theory, but this may be isolated to my particular setup. When I re-geared, I still had the stock output shaft with the balancer. No other changes were made to the jeep other than the re-gear. This was when the vibes were the worst. FYI.
I'm going to put a small crink in the balancer theory, but this may be isolated to my particular setup. When I re-geared, I still had the stock output shaft with the balancer. No other changes were made to the jeep other than the re-gear. This was when the vibes were the worst. FYI.
Same guy. Tworley and I know him in real life. Very smart and very helpful.
Unlimited04 on JF
This is bringing up a subject on another post however I think it may have some merit for you smart guys.
The debate regarding heims versus rubber dampened control arms may also be an affect. These the the first dampeners attached to the frame post axle which with gear changes and pinion angles could dampen vibrations. Also probably why the manufacturers put them in to help calm imperfections is angles, balances and even imperfect mounting positions.
Thoughts?
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The debate regarding heims versus rubber dampened control arms may also be an affect. These the the first dampeners attached to the frame post axle which with gear changes and pinion angles could dampen vibrations. Also probably why the manufacturers put them in to help calm imperfections is angles, balances and even imperfect mounting positions.
Thoughts?
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It's been quite some time since I've been on JF, but last I heard he got something else to drive daily and doesn't drive the jeep much.
He reappears on occasion. Life got busy with him in recent years. Good things, though.
I run stock springs and driveshafts. I added a Nth TT with a week of buying the LJ, so I do not know if the harmonic/cyclical vibes were there with the stock skid. The Nth skid did add some vibes at idle that were not present with the stock skid.
Are your pinion angles properly adjusted? I have no experience with what's needed after a TT, perhaps @Chris can give you a list of things to check. I would guess that your case is likely driveline vibrations ..
Let me read his thread, I think I found it.
Your case is a pretty involved example with many changes and I have to back and read the sequence of things that you recently posted carefully. I'll keep what you said here in mind while reading and see if that factoid falls in the framework of what I'm saying it or not.
I have the stock control arms and drive shafts. I'm going to add new springs, arms, rear driveshaft, and other goodies when I regear.
If mine still has a vibration after Dave does his thing with the mid-arm install and RubiCrawler install, I'm going to pick it up from him, take it home, and I'll figure it out myself, including adding weight to the harmonic balancer to see if it makes any difference.
Dave is so busy with these big projects that I think he simply doesn't have the time to chase down vibrations. I'm sure he will figure it out with yours @psrivats, the question is simply going to be how much time it will take. I guess I figure that if the same thing happens to mine, rather than have him sitting on it for 6-months, I'll just spend my own spare time trying all sorts of different things to see if I can figure it out.
This isn't an impossible problem to solve. The problem is simply that no one has spent enough time trying to figure it out to actually solve it.
In addition, it might not be the same solution for everyone.
Dave is so busy with these big projects that I think he simply doesn't have the time to chase down vibrations. I'm sure he will figure it out with yours @psrivats, the question is simply going to be how much time it will take. I guess I figure that if the same thing happens to mine, rather than have him sitting on it for 6-months, I'll just spend my own spare time trying all sorts of different things to see if I can figure it out.
This isn't an impossible problem to solve. The problem is simply that no one has spent enough time trying to figure it out to actually solve it.
In addition, it might not be the same solution for everyone.
@Chris I might end up doing the same and perhaps have my local mechanic take a crack at it. Already been without the Jeep for too longAnother week has gone by.
Part of me is tempted to tell you to just put the 4.10 gears back in, but I really don't want you to do that, as a problem like this will drive me nuts (even though it's your problem) until there's a resolution. I'm not the type that likes walking away from problems and accepting defeat.
I agree. I don't think there be one "be all, tell all" solution for all of us having these problems. My case is a prime example. I don't see a lot of 231/5speed jeepers having these vibes post re-gear.