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Old 05-07-2011, 01:00 PM   #1
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Serious brain fart...

I think I'm right.... Going to a larger diameter tire will increase the pinion angle....right?

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Old 05-07-2011, 01:14 PM   #2
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Originally Posted by KBR97 View Post
I think I'm right.... Going to a larger diameter tire will increase the pinion angle....right?
No. Because the frame and drive train are still in the same relationship to each other no matter what size tire. It's the suspension lift that will affect pinion angle

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Old 05-07-2011, 01:21 PM   #3
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Thats exactly what I was thinking. It shouldn't effect anything.
ugh....

The jeep was sitting for the entire winter. I just put in a replacement transmission, and went from 32 AT's to 35 GY MTR. Could it be the aggresive tread giving me vibes. Thats the only thing that changed. Like I said in the other thread I had the vibes pretty much gone last year with the tcase spacers and mml....now they seem to suddenly be back.
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Old 05-07-2011, 01:41 PM   #4
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Maybe its as simple as a tire being out of balance. But that would cause more of a wobble or shake than a vibration right?
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Old 05-07-2011, 06:48 PM   #5
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If you have never had an aggressive tread before you will have a noticeable fast vibration at very slow speeds... Not a slower loping type of vibration like there would be with drive lines. On the other hand those new tires could be putting a little more stress on everything pulling your pinion angle just far enough out of whack under throttle to cause it. If it is the latter just take a few washers and use them to drop the transfer case a hair, you should be able to tell immediately if that is what happened.
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Old 05-07-2011, 06:58 PM   #6
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The Jk Rubi has the BFG MTs and I do feel that initial vibe. I think Im gonna wait and see what happens when I do the SYE. Maybe I will throw a washer or 2 in the skid.
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Old 05-07-2011, 08:26 PM   #7
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Quote:
Originally Posted by KBR97
The Jk Rubi has the BFG MTs and I do feel that initial vibe. I think Im gonna wait and see what happens when I do the SYE. Maybe I will throw a washer or 2 in the skid.
Unless im mistaken both the jk and all rubi's don't have a slip yoke to eliminate. You may want to look at other ways to correct vibes.
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Old 05-07-2011, 08:31 PM   #8
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Quote:
Originally Posted by jrussblues View Post
Unless im mistaken both the jk and all rubi's don't have a slip yoke to eliminate. You may want to look at other ways to correct vibes.
his comment about the JK was referring to the vibes the poster above him was talking about.

the SYE he is talking about is going on his TJ that is the subject of this thread.
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Old 05-07-2011, 09:20 PM   #9
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Quote:
Originally Posted by schnutzy

his comment about the JK was referring to the vibes the poster above him was talking about.

the SYE he is talking about is going on his TJ that is the subject of this thread.
? Im thoroughly confused now.
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Old 05-07-2011, 09:24 PM   #10
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? Im thoroughly confused now.
shnutzy is right, lol.
The original topic is about vibes in the TJ. I was just referring to having experience with aggressive tread on my JK Rubi.
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Old 05-07-2011, 09:26 PM   #11
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Gotcha...piece of advice on the sye
..get a new speedo gear seal before you start. Mines causing me trouble now and the rtv trick didn't work.
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Old 05-07-2011, 09:29 PM   #12
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Cool, I'll keep it in mind.
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Old 05-07-2011, 09:33 PM   #13
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Originally Posted by KBR97
Cool, I'll keep it in mind.
Oh and tighten the drain plug. Ha...im an idiot. Have fun.
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Old 05-07-2011, 09:43 PM   #14
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rtv trick? who corrects speedos these days? anyways, my man kbr. I have been told that an alignment cannot be the cause of vibrations, but I just got my jeep aligned friday and it helped a ton with the problems I had vibrations wise. Tjs, especially lifted tjs, are always gona have some vibes, thats just how they are. but the alignment definitely helped. I assume the 35s you put on were new? try getting an alignment and balance and see what happens. otherwise just live with it, it probably is the tread.
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Old 05-07-2011, 09:52 PM   #15
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Originally Posted by GoldenSahara00
rtv trick? who corrects speedos these days? anyways, my man kbr. I have been told that an alignment cannot be the cause of vibrations, but I just got my jeep aligned friday and it helped a ton with the problems I had vibrations wise. Tjs, especially lifted tjs, are always gona have some vibes, thats just how they are. but the alignment definitely helped. I assume the 35s you put on were new? try getting an alignment and balance and see what happens. otherwise just live with it, it probably is the tread.
Didn't swap the gear, you have to take it out when installing a sye, the directions suggest using black rtv around the seal when you put it in the replacement housing. I tried with and without and reinstalled the housing. Didn't work, ill be replacing the gasket.
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Old 05-07-2011, 10:08 PM   #16
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I wasnt seriously asking, I was joking but thanks haha. so I still dont get exactly what your saying. for the speed you just need a new speedo gear?
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Old 05-07-2011, 10:18 PM   #17
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Originally Posted by GoldenSahara00
I wasnt seriously asking, I was joking but thanks haha. so I still dont get exactly what your saying. for the speed you just need a new speedo gear?
The speedo gear has an o ring that seals it into the tail housing on the tf case. Apparently there is some type of magical.seal it forms with the factory set up. If it doesn't seal correctly it will let atf+4 leak from your tf case which can obviously be problematic. Im having problems with.it now so im gonna get a new o ring and see if it helps. The sye instructions tell you to put black rtv om the seal to help it out, I also tried that with no luck.
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Old 05-08-2011, 08:38 AM   #18
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Unless you just have to change it for you're own happiness, your gps will give you speed. I know I run 31x10.5s and my speedo is about 4 miles slow so at 50 mph I'm really at 54-55 and I just remember that. It's a cheaper fix. jj
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Old 05-08-2011, 08:56 AM   #19
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Unless you just have to change it for you're own happiness, your gps will give you speed. I know I run 31x10.5s and my speedo is about 4 miles slow so at 50 mph I'm really at 54-55 and I just remember that. It's a cheaper fix. jj
Again...not changing the speedo, its leaking. And how is a gps cheaper than a speedo gear?
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Old 05-10-2011, 09:54 PM   #20
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I found the culprit of the vibes, or it found me...either way..


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