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Unread 09-06-2013, 06:59 PM   #1
sean112280
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Couple questions?

I have a T-18 mated to a SBC. I just started getting a shimmy that feels like it's in either the trans or the front diff. Curious as to see if anyone else has had this happen before. Also what fluid is recommended for the trans and the diffs? My other question has to do with the clutch...what clutch could I use to replace mine in case that's my issue? I don't know if there has to be a specific model or what. Thanks for any information.

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Unread 09-06-2013, 07:19 PM   #2
LumpyGrits
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What speed?
What was the last thing you did to this Jeep?
Check to see if you broke the tranny mount or an engine mount.
Check to see if your tires need to be rebalanced.
See if you bent a wheel.
Ck all DS U-joints, and slip spline
LG
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Unread 09-06-2013, 07:47 PM   #3
sean112280
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Quote:
Originally Posted by LumpyGrits
What speed?
What was the last thing you did to this Jeep?
Check to see if you broke the tranny mount or an engine mount.
Check to see if your tires need to be rebalanced.
See if you bent a wheel.
Ck all DS U-joints, and slip spline
LG
4 speed. Last thing I did was replaced the front driveshaft and it wasn't doing this. Tranny mount is good. Checked that. Will check the motor mounts.
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Unread 09-07-2013, 09:17 PM   #4
sean112280
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Any ideas?
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Unread 09-07-2013, 09:27 PM   #5
jeepwhore
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Quote:
Originally Posted by sean112280

4 speed. Last thing I did was replaced the front driveshaft and it wasn't doing this. Tranny mount is good. Checked that. Will check the motor mounts.
LG means, at what speed does the shimmy occur? Does it happen in every gear regardless of how fast you are going?
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Unread 09-08-2013, 12:55 PM   #6
sean112280
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Quote:
Originally Posted by jeepwhore

LG means, at what speed does the shimmy occur? Does it happen in every gear regardless of how fast you are going?
I feel it most when it's in 3rd gear and when I downshift into second.
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Unread 09-08-2013, 01:51 PM   #7
LumpyGrits
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When was the last time you checked the U-joints for slop?
Get under the jeep and do so ASAP! Before you 'throw' the DS.
LG
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Unread 09-08-2013, 02:03 PM   #8
sean112280
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Quote:
Originally Posted by LumpyGrits
When was the last time you checked the U-joints for slop?
Get under the jeep and do so ASAP! Before you 'throw' the DS.
LG
Just like a week or two ago when I replaced the driveshaft. I can grease them up again though
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Unread 09-08-2013, 02:13 PM   #9
LumpyGrits
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Get under that Jeep and see if you lost a snap-ring and check the DS U-joints for side to side play.
LG
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Unread 09-08-2013, 02:34 PM   #10
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I'm assuming you have a full time transfer case, and that's why the front drive shaft is engaged? Was the new drive shaft balanced (and is the balancing weight still attached?)?
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Unread 09-08-2013, 02:41 PM   #11
sean112280
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It's a D20 and no it's not always engaged. The driveshaft came straight out of another CJ. Like I said this just started happening. The replacing of the DS was about 3 weeks ago. The shimmy didn't start until this past week
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Unread 09-08-2013, 02:41 PM   #12
sean112280
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Quote:
Originally Posted by LumpyGrits
Get under that Jeep and see if you lost a snap-ring and check the DS U-joints for side to side play.
LG
Will do
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Unread 09-08-2013, 04:00 PM   #13
Spieg8
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Quote:
Originally Posted by sean112280 View Post
It's a D20 and no it's not always engaged. The driveshaft came straight out of another CJ. Like I said this just started happening. The replacing of the DS was about 3 weeks ago. The shimmy didn't start until this past week
Well there's some detail that was lacking (might list that TC on your profile). Anyhow, like LG stated, u-joints and tire balance would be the normal suspects for vibration. And to answer your earlier questions, 90wt gear oil is normal for a t-18, and the clutch shouldn't be different than normal for your SBC.
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Unread 09-08-2013, 06:44 PM   #14
sean112280
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Thank you for the help. I will be digging into this further.
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Unread 09-08-2013, 11:11 PM   #15
BagusJeep
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Ave you taken the slip joint apart and put the shaft back together?

The joints need to work in opposite phases by 90 degrees to cancel out the change in angular velocity on each joint but there are two possible points and they are only balanced at the factory in one, at 90 degrees or 270 degrees. It can go back together in 20 odd different ways but only one is correct.

Look at your joints, are they 90 degrees out of phase? If so are you sure they are not 270 degrees out of phase as it will look identical?

This will cause vibration at speed and more keenly when the suspension is extended and those joints are working harder.
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