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1993 Isuzu Rodeo Question Truck shakes violently in fiifth g

Tiny
LAFFLIN
  • MEMBER
  • 1993 ISUZU RODEO
  • 4 CYL
  • 2WD
  • MANUAL
  • 180,000 MILES
My truck recently starting shaking in fifth gear usually at about 50 mph. It has since gotten worse and even happens in fourth now I think as of today. I usually have to take it out of gear and coast for a minute and then it will usually settle down. Sometimes I will have to take it out and put it back a few times.

This is definately not from an out of balance tire, I am talking alot more shake than that. Imagine you going down the road and suddenly your tires all morph into squares.

The shaking and jerking can be felt all over, but I feel it most in the shifer, and engaging the clutch relieves it.
Today I was sure I wasn't going to make it home from work, it was worse than normal and all my dash lights came on. This doesn't happen at lower speeds.

Any help is very much appreciared.
I kinda checked the U-joints for play, but I can't move them with my hand, and I would think if that was it it would have to be alot, like six inches of play. But I'm not a mechanic.
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Friday, August 22nd, 2008 AT 7:47 PM

7 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Take a good look at the carrier bearing for play or sag:


https://www.2carpros.com/forum/automotive_pictures/30961_izu_2.jpg

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Friday, August 22nd, 2008 AT 8:33 PM
Tiny
LAFFLIN
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  • 4 POSTS
I will do that. I'm not a mechanic except for when I have to be, so I should ask, in acceptable condition I shouldn't be able to wiggle this thing? And if I can that would indicate that it's bad? And if so, can I change this piece myself without a lift?

And thanks so much for such a quick reply! Having a question responded to by a professional that quick for a very small donation is so very worth it. Thanks.
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Friday, August 22nd, 2008 AT 8:41 PM
Tiny
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The webbing in the carrier bearing should be reletively stiff. IF it is on the sloppy side that is probably the source, but keep in mind there are many potential sources, this being more common.

You may see tears in the webbing as well. You don't need a lift, but will need a puller.


https://www.2carpros.com/forum/automotive_pictures/30961_izu1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/30961_izu2_1.jpg

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Saturday, August 23rd, 2008 AT 4:53 AM
Tiny
LAFFLIN
  • MEMBER
  • 4 POSTS
It looks like I have only a carrier bearing about half way back on the axle. I was looking for one up near the transmission like the diagram shows, but there isn't one.

So anyway, I'm not sure exactly what the check procedure is. Am I supposed to grap the axle and wiggle it to see if there is play? If that's the case then yes there is some play, but I would have thought that was natural to absorbe some shock. I can easily wiggle it though. The rubber is in tact.
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Sunday, August 24th, 2008 AT 7:18 PM
Tiny
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Getting clear and accurate diagrams and info is always a challenge in this industry. It really goes beyond imagaination. I am just showing what info I have.

On the carrier, yes it should absorb shock and should be somwhat stiff. It may become a judgement call. Get a good feel for hoe it is and stop and the parts store and evaluate how much stiffer the new one is versus yours. Not any different than shock absorbers, the webbing gets weak over time. How weak to make an issue can come down to opinion.
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Sunday, August 24th, 2008 AT 8:39 PM
Tiny
LAFFLIN
  • MEMBER
  • 4 POSTS
I don't know, I'm thinking that the carrier bearing probably isn't the cause of my issue. The give seems to be about what I would expect it to be. Ofcourse I have no experience in this type of thing.

Can you think of anything else that might cause those symtoms? Just to reiterate, it's definately not an unbalanced tire, The shaking is to violent to be that. And this happens intermittently. I couldn't get it to happen today at all. It usually happens between 50-55 mph, but the other day happened at a much lower speed. Also, when I engage the clutch and coast for a minute it usually goes away when I get back into gear.

I'm pretty sure my truck is eventually going to kill me.
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Sunday, August 24th, 2008 AT 8:54 PM
Tiny
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I think I would have the drive shaft checked for balance and while it is out check the u-joints for stiffness.


https://www.2carpros.com/forum/automotive_pictures/30961_ujPA240003_2.jpg



IF you see any rust dust around the caps of the u-joints, you may find they look like this inside.
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Monday, August 25th, 2008 AT 5:40 AM

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