Driveline vibes
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 64
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From: Andover, MN
Year: 1996
Model: Cherokee
Engine: 4 liter I6
Driveline vibes
So before you flame me or start posting links to write ups of the topic take a look at my pics first. I know I'm not the first to post this type of topic and yes I did use the search tool as well as Google. I cannot figure out the cause of my problem and I was hoping that a kind forum member could chime in and help me think of something I haven't yet.
I get the typical drive line vibes at the normal speeds but as far as I can tell my pinion angle is good, maybe it isn't but I can't see it. I installed IRO's hack and tap SYE and a front drive shaft from a Cherokee. I have the NP242 and a 8.25. Now I have tried pulling the front drive shaft, swapping them with another I have laying around and checked to see if the u joints are working properly and everything checks out.
Here's the pics:
Now these are with the jeep in reverse and drive with the e brake pulled. I don't remember which is which though:
Thanks in advance for any helpful advice you may give me.
I get the typical drive line vibes at the normal speeds but as far as I can tell my pinion angle is good, maybe it isn't but I can't see it. I installed IRO's hack and tap SYE and a front drive shaft from a Cherokee. I have the NP242 and a 8.25. Now I have tried pulling the front drive shaft, swapping them with another I have laying around and checked to see if the u joints are working properly and everything checks out.
Here's the pics:
Now these are with the jeep in reverse and drive with the e brake pulled. I don't remember which is which though:
Thanks in advance for any helpful advice you may give me.
CF Veteran
Joined: Sep 2009
Posts: 1,142
Likes: 2
From: Grand Prairie, Texas
Year: 1998
Model: Cherokee
Engine: 4.0 HO I6
Those look really good. How about the front drive shaft? Have you tried pulling it and driving your rig around without it to see if that helps?
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 64
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From: Andover, MN
Year: 1996
Model: Cherokee
Engine: 4 liter I6
I had the front pulled when I put the SYE in and drove around with out it and had the same results as with it in but I can pull it out again and check tomorrow. I did add some shackle relocation brackets so those may have changed the pinion angle on the rear slightly since I had the front shaft out.
Newbie
Joined: Oct 2011
Posts: 28
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From: Michigan
Year: 2001
Model: Cherokee
Engine: 4.0
I wonder if the slip in the driveshaft is to tight. When the suspension goes up it is going to bind since there is no room for the slip to go up any further. It looks fully collapsed in the picture.
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 64
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From: Andover, MN
Year: 1996
Model: Cherokee
Engine: 4 liter I6
that is one problem I have noticed, due to me having the 242 and a 8.25 it makes for needing a short drive shaft. Even if I cut the t case output shaft shorter I would maybe gain a half inch so not too much. I eventually want to get my dana 44 done and mounted in the jeep which has a shorter pinion so I don't want to go and buy a shorter shaft for just the time being. Does anyone knows of a shaft out of another vehicle that might be the appropriate length that I could pick up cheap?
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 64
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From: Andover, MN
Year: 1996
Model: Cherokee
Engine: 4 liter I6
I got around to pulling the front drive shaft off today and it didn't change anything. Yes I did check the u-joints, and I've tried 2 different drive shafts including a rebuilt one and both cause bad drive line vibes.
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Member
Joined: Sep 2010
Posts: 161
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From: Orlando, FL
Year: 1989
Model: Cherokee
Engine: 4.0 Renix
Looks like your pinion angle on the rear axle isn't right, and your pinion seal on your rear axle is leaking!!
I'm no expert on pinion angle as I have major vibes too and I'm trying to work them out, but the yoke on the axle is definitely not at the same angle as the yoke on the tcase in your photos.....
I'm no expert on pinion angle as I have major vibes too and I'm trying to work them out, but the yoke on the axle is definitely not at the same angle as the yoke on the tcase in your photos.....
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 64
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From: Andover, MN
Year: 1996
Model: Cherokee
Engine: 4 liter I6
with the type of drive shaft I am using it is supposed to be at the angle it's at according to this write up: http://www.cherokeetalk.com/forum/f6...-angles-13941/
And yes the pinion seal is seeping a little bit but I'm not worried about it, I have another axle I plan to install fairly soon.
And yes the pinion seal is seeping a little bit but I'm not worried about it, I have another axle I plan to install fairly soon.
Senior Member
Joined: Apr 2010
Posts: 615
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From: Bonney Lake, WA
Year: 1989
Model: Cherokee
Engine: 4.0 IL6
Have you checked to see if the output shaft from the transfer case has any play in it? Your angles look good and if you are sure the u-joints are good and have tried different shafts then the problem could be in your transfer case.
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 64
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From: Andover, MN
Year: 1996
Model: Cherokee
Engine: 4 liter I6
ok, I'll try and pull the shaft out and see what kinda play it's got. When it was factory height it didn't vibe at all but I suppose with the increased angles from the lift it'd put more stress on the out put shaft.
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Joined: Jul 2011
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From: Mt. Vernon Washington
Year: 1991
Model: Cherokee
Engine: 4.0L Renix and tube header
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 64
Likes: 0
From: Andover, MN
Year: 1996
Model: Cherokee
Engine: 4 liter I6
Does anyone know of a shaft from another vehicle that would be a little shorter or am I going to need to have a custom length one made?
CF Veteran
Joined: Jan 2011
Posts: 1,894
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From: Las Vegas
Year: 1999
Model: Cherokee
Engine: 4.0
here you go....
I was in the same boat as you. I had a 3" lift with the ax15/231/8.25 combo. I went with the JB CONVERSIONS SYE, it is the best on the market. And is still only $199. That company has very close ties with new process gear(the company that produces the np231)http://www.jbconversions.com/product...1j_std_sye.php
Here is a chart that lists all the drive shaft length for the xjs and zjs. You WILL need a longer one! I went with one of the longest ones available...33"... And I still only have about 2" of slip left in the driveshaft. I found one on eBay for $30 and repainted it and put new u joints in it. For a grand total of $250 for a full SYE and DriveShaft! And it has given me nothing but smiles!!!!
These are measurements UJOINT TO UJOINT
BOLD ONES ARE LONGEST
XJ 87/88 2.5 Automatic 27.950 53003912
XJ 89/93 2.5 Automatic 27.970 53005540
XJ 89/01 2.5 Manual 25.310 53005541
XJ 89/01 4.0 Automatic 30.660 53005542
XJ 89/01 4.0 Manual 29.250 53005543
XJ 89/00 4.0 Manual 27.080 Export 53005544
XJ 89/00 4.0 Automatic 28.620 Export 53005545
XJ 87/88 4.0 Automatic Export 53005260 *
XJ 95/01 Diesel 27.640 Export 52098208
ZJ 1993 4.0 Automatic 30.530 52098341
ZJ 93/95 5.2 Automatic 32.870 w/o CV 53008427
ZJ 94/95 5.2 A500 30.625 w/o CV 52087805
ZJ 94/95 4.0 A500 w/o CV 52098790
ZJ 93/96 4.0 Manual 52098344
ZJ 93/96 4.0, 5.2 31.875 w/ 231, 242 52087805
ZJ 93/95 4.0 Manual 30.000 w/231 52088090
ZJ 93/96 5.2 33.000 w/ 231 53008427
ZJ 96/98 5.2, 5.9 31.250 w/ 249 & Model 30 52098379
ZJ 1996 5.2 Automatic 32.875 w/ 249 & Model 30 52098501
ZJ 96/98 4.0 33.000 w/ 242 52098707
ZJ 96/97 4.0 Automatic 31.250 52098850
ZJ 1996 5.2 Automatic 30.750 w/ 249 & Model 30 52099246
ZJ 96/98 4.0 33.500 w/ 249 52099260
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Here is a chart that lists all the drive shaft length for the xjs and zjs. You WILL need a longer one! I went with one of the longest ones available...33"... And I still only have about 2" of slip left in the driveshaft. I found one on eBay for $30 and repainted it and put new u joints in it. For a grand total of $250 for a full SYE and DriveShaft! And it has given me nothing but smiles!!!!
These are measurements UJOINT TO UJOINT
BOLD ONES ARE LONGEST
XJ 87/88 2.5 Automatic 27.950 53003912
XJ 89/93 2.5 Automatic 27.970 53005540
XJ 89/01 2.5 Manual 25.310 53005541
XJ 89/01 4.0 Automatic 30.660 53005542
XJ 89/01 4.0 Manual 29.250 53005543
XJ 89/00 4.0 Manual 27.080 Export 53005544
XJ 89/00 4.0 Automatic 28.620 Export 53005545
XJ 87/88 4.0 Automatic Export 53005260 *
XJ 95/01 Diesel 27.640 Export 52098208
ZJ 1993 4.0 Automatic 30.530 52098341
ZJ 93/95 5.2 Automatic 32.870 w/o CV 53008427
ZJ 94/95 5.2 A500 30.625 w/o CV 52087805
ZJ 94/95 4.0 A500 w/o CV 52098790
ZJ 93/96 4.0 Manual 52098344
ZJ 93/96 4.0, 5.2 31.875 w/ 231, 242 52087805
ZJ 93/95 4.0 Manual 30.000 w/231 52088090
ZJ 93/96 5.2 33.000 w/ 231 53008427
ZJ 96/98 5.2, 5.9 31.250 w/ 249 & Model 30 52098379
ZJ 1996 5.2 Automatic 32.875 w/ 249 & Model 30 52098501
ZJ 96/98 4.0 33.000 w/ 242 52098707
ZJ 96/97 4.0 Automatic 31.250 52098850
ZJ 1996 5.2 Automatic 30.750 w/ 249 & Model 30 52099246
ZJ 96/98 4.0 33.500 w/ 249 52099260
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