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ZUKIWORLD Discussion Forum => Technical Discussion - Beginner / Repair => Topic started by: BakerMT on April 15, 2011, 09:29:30 AM

Title: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: BakerMT on April 15, 2011, 09:29:30 AM

So in 5th gear around 2500rpm I start getting a deep vibration, it also kicks in in 4th around 3000rpm.
Vibrates the whole rig, and keeps going even after I let out the clutch and pull it out of gear.
I'm pretty sure it's in the transmission, but just not 100%

Anyone got any ideas?

It's a 1987 with minimal mods (different hubs, and headers) bought it about 2 years ago now. Used to be towed behind an RV, the guy I bought it from used it as his hunting rig to get into the mountains. Said he owned a soft top before this one. He took the drive train out of the soft top and put it into this rig.

Title: Re: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: Jluck on April 15, 2011, 10:04:56 AM

Is this a new vibe. Or has it been there the whole time you have owned it?

Title: Re: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: BakerMT on April 15, 2011, 10:56:12 AM

There has always been a slight grinding in 5th, but no deep vibration.
Also if I'm in neutral and let out the clutch there is a change in tone from the transmission. Not grinding but a deeper sound.
If the rig is cold and I let out the clutch in neutral the change is enough to stall the rig.

Title: Re: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: rascott on April 15, 2011, 11:13:52 AM

possible u-joint failure?
doesn't sound like a broken mount.
mabe

Title: Re: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: BakerMT on April 16, 2011, 08:26:04 AM

So to sound like a dumb ass, where might the u-joint be?
Just trying to figure this little girl out.

Thanks guys

Title: Re: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: fireman2828 on April 16, 2011, 08:44:40 AM

u-joints are on the end of the drive shafts. Try shacking on them and turning them and see if their is excessive play or movement.

Title: Re: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: BakerMT on April 16, 2011, 12:57:33 PM

Thanks again for the tips guys!
This is pretty sweet I'm in middle of Nowhere Montana

Title: Re: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: yzf438 on April 17, 2011, 12:32:10 PM

so reading through your post you said that it will stall the motor when you let the clutch out when cold?  and you still hear it in neutral  when you are sitting still, with the clutch out right?

if thats the case and that samurai was towed with that tranny very much its most likely the output bearing on the back of the tranny.  I have been told that bearing will not lube right during towing.

something to check out  if your u joints are all good.

Title: Re: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: BakerMT on April 28, 2011, 10:18:36 AM

Hey yzf438,
I think you may have nailed it. This rig was towed behind an RV ALOT before I bought it.
Any ideas on the fix, or what I may need to say when I get it to a tranny place?
I'm just hoping to not pay a whole bunch, but I guess it is a tranny.

And yes all the U-joints look good.

But thanks again for all the tips guys and gals, thsi helps a bunch!

Title: Re: Deep vibration in 5th gear above 2500rpm, any ideas
Post by: ebewley on April 29, 2011, 03:50:44 PM

Quote from: BakerMT on April 15, 2011, 10:56:12 AM

There has always been a slight grinding in 5th, but no deep vibration.
Also if I'm in neutral and let out the clutch there is a change in tone from the transmission. Not grinding but a deeper sound.
If the rig is cold and I let out the clutch in neutral the change is enough to stall the rig.

Your bearings in the transmission are failing and will need servicing. There are rebuild kits available for that and I think both Trail Tough and Hawk offer a rebuild service.  $500-$600 fix

Good luck, -Eric