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Old 06-30-2011, 06:17 AM   #1
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Massive Vibration - Need help please

Hey i have a 00' honda s2000. This is my first post so sorry if it's not the best.

So this is the go, about 4 months ago i started feeling huge vibrations at 10mph+ from the front and rear. and ever since i've been taking it in and out of the mechanics.

I have change the cross member, rear diff mounts and diff axles. I also got my wheels balanced. and problem still not solved. (btw car is stock standard, no work done).

I then dropped it off to another mechanic and he said i need to reconditon my diff or change it. It didn't seem right though cause my diff ain't making any noises!

So i took it to another mechanic to get another opinion, he put it on the hoist and got his mate to sit in it and drive it. We stood underneath the car and notice the vibration is coming from the Gearbox.

Now this is were i'm confused, my gearbox feels perfect, gets into gears and never crunches! but the mechanic is saying i need to get a new gearbox or get this one recondition.

Does this sound right?? what should i do.?
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Old 06-30-2011, 06:22 AM   #2
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Dan, give us some more info on the vibration, I know it is hard but does is it constant from 10mph on and never stops? Does it make a sound or do you just feel it? Do you feel it in the stick, steering wheel, pedals or butt? That will certainly help someone make a better guess.
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Old 06-30-2011, 06:29 AM   #3
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The vibration gets more worst as i accelerate. when im off the foot peddle its doesnt vibrate. but one thing ive notice, more higher the gear im in more it vibrates.

the car shacks like crazy, front, rear and steering wheel
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Old 06-30-2011, 06:35 AM   #4
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Driveshaft off balance?
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Old 06-30-2011, 06:41 AM   #5
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The mechanic goes the gearbox is causing the driveshaft to shake. driveshaft does feel a little sloppy

Last edited by danheat; 06-30-2011 at 06:50 AM.
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Old 06-30-2011, 10:14 PM   #6
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Driveshaft off balance?
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Old 06-30-2011, 11:46 PM   #7
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how do u balance a driveshaft?

btw when im doing high or low speeds, and im off the footpeddle, it stops vibrating. its only when i gas it. could this still mean driveshaft is out of balance?

Last edited by danheat; 06-30-2011 at 11:57 PM.
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Old 07-01-2011, 04:46 AM   #8
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The propeller shaft (drive shaft) does have universal joints at either end, those being bad sounds like your problem. That would cause the vibration, and would be affected by power on or off.

The bad news is the service manual doesn't show them as a replaceable part so you may be looking at buying a whole new propeller shaft.
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Old 07-01-2011, 04:47 AM   #9
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"driveshaft does feel a little sloppy"
I'd godda go wit' 'blade'n Phil on'iss Dan.

'N'I'd add'datt, iff'yuh don't gedd'er'da somebody whut knowz driveshaftz, you likely will need to replace'da gearbox.
('N replace all'a fillin'z in yer teeth.)

Also soun'z like you've godda doo'yer homework'n seek out'a reputable mechanic.
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Old 07-01-2011, 05:51 AM   #10
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how do u balance a driveshaft?

btw when im doing high or low speeds, and im off the footpeddle, it stops vibrating. its only when i gas it. could this still mean driveshaft is out of balance?
There are shops that specialize in reconditioning drive shafts. There's one in Atlanta that used to build lightened, balanced drive shafts for me for the race car. They're not cheap but the work is excellent. I'm sure that if you look, you can find a shop that does the same kind of work near you.
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Old 07-01-2011, 07:59 AM   #11
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it has to be the gearbox, cause the shaft thats coming out of the gearbox is shaky and and gearbox is shaky.

thanks everyone for ya suggestions. if anything else please let me know
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Old 07-01-2011, 02:33 PM   #12
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it has to be the gearbox, cause the shaft thats coming out of the gearbox is shaky and and gearbox is shaky.

thanks everyone for ya suggestions. if anything else please let me know
How often did you change your transmission oil?
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Old 07-01-2011, 02:50 PM   #13
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um about 3 months ago. could it be **** oil?

i bought the tran oil from honda. they said this is what they use on all there cars.
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Old 07-01-2011, 03:56 PM   #14
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Nope at this point sounds like the secondary shaft bearings are bad.

The good news, is if that is all it is, you don't have to drop the whole transmission to fix it. You just remove the back of the transmission that has the secondary gear, shifter, and secondary shaft in it.

While you have it open you might consider replacing your secondary shaft and gear with the AP2 version. You should probably replace them either way (AP1 or AP2). Last I checked the shaft, gear, bearings will run you around $300.

The plus with the AP2 gear and shaft is this will give you almost 10% more torque at the rear wheels for faster acceleration. The negative is it also means 10% more torque goes through the rear differential, and that either your speedometer will be off 10%, or you need to get a Yellow Jacket or Yellow Box to correct the speedometer.
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Old 07-01-2011, 05:58 PM   #15
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that sounds about right. ill let my mechanic know. could it be the gearbox mounts aswell? or mounts wouldn't produce that much vibration?
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Old 07-01-2011, 07:04 PM   #16
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Transmission bolts up to the back of the engine. The shifter attaches is attached directly to the transmission. So, unless your shifter is dancing like a hula-girl in the windshield of a ’57 Chevy it’s highly unlikely that the transmission itself is loose.
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Old 07-01-2011, 09:51 PM   #17
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my mate is selling a gearbox and driveshaft for $1500 but its off a 2005 ap2. would that fit on my 2000 model?
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Old 07-02-2011, 05:51 AM   #18
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If it were me, I'd crack the back of the transmission, and find out if that is the problem. Why spend $1500, if you can spend $300?
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Old 07-02-2011, 09:30 AM   #19
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yea true. btw if the secondary shaft was gone, wouldnt it be making a whining noise? not a vibration?
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Old 07-02-2011, 12:08 PM   #20
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yea true. btw if the secondary shaft was gone, wouldnt it be making a whining noise? not a vibration?
You said there was play on the transmission side of where the propeller shaft connects to the transmission. That is connected to the secondary shaft. I believe if the only way there would be play there is if the secondary shaft bearing was bad.

You said the car still shifted fine, and that there didn't seem to be other issues with the transmission. If you want to buy a new transmission and swap it out go for it. There is a lot more labor to drop the whole transmission than just open the back and replace the secondary gear, shaft and bearings.
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Old 07-02-2011, 05:14 PM   #21
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ok no worries. so what should i say to my mechanic? and what parts do i need to get?

btw martin ur alot of help thanks
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Old 07-02-2011, 05:41 PM   #22
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ok no worries. so what should i say to my mechanic? and what parts do i need to get?

btw martin ur alot of help thanks
Here is the link to the exploded view of the secondary shaft (23230-PCY-A00)

http://www.hondaautomotiveparts.com/...ECONDARY+SHAFT

You'll need the shaft and associated bearings and seals, I would take the advice of your mechanic on what you need.

Here is the link to the exploded view of the counter shaft, the secondary gear (23241-PCY-A00) mounts to the end of it, outside of the main transmission housing.

http://www.hondaautomotiveparts.com/...RSHAFT+%281%29

You or your mechanic should have a copy of the service manual for doing this work (torque specs and reference).

He'll need to put a wrench on the crankshaft pulley with the transmission in gear to torque the nut on the secondary gear (this isn't in the manual, since they would have you drop the whole transmission, which you don't need to just remove the back part with the shifter).
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Last edited by TTMartin; 07-02-2011 at 08:18 PM.
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Old 07-02-2011, 06:42 PM   #23
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cheer man.

um you said i should go ap2 shaft and gear. would that increase my speed in 1-4 gears?
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Old 07-02-2011, 07:06 PM   #24
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It gives you lower gearing in all gears. It will decrease your top speed in each gear, but, increase the torque at your rear wheels (faster acceleration).

Gear plot AP1 transmission with AP2 secondary gear and shaft.
Click the image to open in full size.

Gear plot Stock AP1
Click the image to open in full size.
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Last edited by TTMartin; 07-02-2011 at 07:12 PM. Reason: added stock AP1 gear plot
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Old 07-02-2011, 07:29 PM   #25
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AP1: Acceleration 0-100Km/h (secs) 6.3

AP2: Acceleration 0-100Km/h (secs) 6.5

so ap1 would be quicker if you wanna race, am i correct?
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Old 07-02-2011, 07:59 PM   #26
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AP1: Acceleration 0-100Km/h (secs) 6.3

AP2: Acceleration 0-100Km/h (secs) 6.5

so ap1 would be quicker if you wanna race, am i correct?
AP1 with lower grearing will be quicker than an AP1 with higher gearing.

This isn't an AP1 vs AP2 thing, it's what different gearing does to a car.

You are just putting an AP2 secondary gear and shaft into change the gearing.

You are NOT putting an AP2 engine, transmission and drivetrain in.
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Old 07-02-2011, 08:13 PM   #27
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oh ok sweet. um for some reason i cant open those link u sent me. is there another url? cheer man
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Old 07-02-2011, 08:19 PM   #28
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oh ok sweet. um for some reason i cant open those link u sent me. is there another url? cheer man
Try them again, I think they are fixed
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Old 07-02-2011, 08:23 PM   #29
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it just says connecting then error comes up . sorry man
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Old 07-03-2011, 12:49 AM   #30
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secondary shaft bearings

secondary shaft AP2

secondary gear AP2

secondary shifter

so thats everything?
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Old 07-03-2011, 05:49 AM   #31
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No such thing as a secondary shifter, and there are a couple seals and other parts you'll need.

Time to start talking to a mechanic and not someone on a internet forum.
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Old 07-03-2011, 06:46 AM   #32
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ok no worries man thanks alot
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Old 07-03-2011, 07:33 AM   #33
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Does the vibration worsen when turning? Have you checked the axle nut for proper tightness? Did you check the CV joints specifically, a slightly cupped one can cause the aforementioned vibration.



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Old 07-03-2011, 07:33 AM
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