Very Bad Vibration

[Mark4g63t]

Well guy's I did an AWD Swap on my Talon and now have a serious vibration problem. Here's what happens/ what I know.

Vibration only happens under acceleration but, not just wot. Normal driving around too.
Vibration gets more intense with RPMs/ speed
Vibration goes away as soon as I let off the gas and coast or if I push in the clutch it will also go away.
Can rev it with clutch in and no noises are heard and nothing is felt.
With all 4 wheels off the ground and tires off and rotors bolted to hubs it still vibrates.
Sounds like the infamous driveshaft thump/ click.

I've checked:
Front and rear axles
CV Boots
Wheel Bearings
Ball Joints
Driveshaft hangers and took video to see if it was wobbling or moving around, It wasn't.
Motor mounts
New rear diff.

Going to be swapping out driveshafts with one thats on a buddies car. So if it's not the driveshaft/ propeller shaft i'm thinking it's transmission related (but not sure what that could be since i'm new to the AWD scene)

Any other things I should look at or try before I drop the tranny to take a peak inside?

Thanks, Mark

 

[eDeclpse92]

Well guy's I did an AWD Swap on my Talon and now have a serious vibration problem. Here's what happens/ what I know.

Vibration only happens under acceleration but, not just wot. Normal driving around too.
Vibration gets more intense with RPMs/ speed
Vibration goes away as soon as I let off the gas and coast or if I push in the clutch it will also go away.
Can rev it with clutch in and no noises are heard and nothing is felt.
With all 4 wheels off the ground and tires off and rotors bolted to hubs it still vibrates.
Sounds like the infamous driveshaft thump/ click.

I've checked:
Front and rear axles
CV Boots
Wheel Bearings
Ball Joints
Driveshaft hangers and took video to see if it was wobbling or moving around, It wasn't.
Motor mounts
New rear diff.

Going to be swapping out driveshafts with one thats on a buddies car. So if it's not the driveshaft/ propeller shaft i'm thinking it's transmission related (but not sure what that could be since i'm new to the AWD scene)

Any other things I should look at or try before I drop the tranny to take a peak inside?

Thanks, Mark

From how you describe it, It sounds like your problem may lie somewhere in between your trans and your engine. A.k.a your flywheel, clutch assembly and starter. I'm saying this because if you free rev it and nothing is wrong then that rules out a motor issue. If you are coasting and nothing is wrong, that rules out wheels, suspension, ball joints etc.

Does the vibration proportionate to the rpms or the speed? I cant see it being both because your drive train spins at different RPM's than your engine does.

 

[Insane20]

Did you do a timing belt when u did your swap?

 

[Mark4g63t]

No, it drove fine before the swap. I know it's not a engine issue. I'd guess it's more RPM dependent.
Stock flywheel and same pressure plate and disc as before.

What in the trans would cause a vibration, with no grinding sounds?

 

[spyderdrifter]

Did you have any issues/problems when putting in the clutch components or mating the trans to the engine¿ I'm almost thinking something is out of balance I.e. drive shaft, or something got broken/damaged upon joining the engine and trans.

 

[Mark4g63t]

No, everything went together really smoothly. It's a used tranny from a known member on a local forum. I really hope he didn't screw me over. Fluid that came out of tranny was clean.

 

[spyderdrifter]

You got any video of the vibration? Does it do it at idle?

 

[Mark4g63t]

Yea but it's hard to hear because I have an open down pipe only on the car.
Only during acceleration.

https://www.youtube.com/watch?v=IhLNqJfCqIw-- Driving
https://www.youtube.com/watch?v=IBSYUE0WOlA-- Looking for wobble (14 sec. can see the t-case and everything shake.)

 

[spyderdrifter]

I can't view your videos unfortunately. I think it's because I have a crappy signal here at school (damn college). I'll watch them later when my class is over tonight. It's hard to see what could cause a vibration only upon acceleration, but not deceleration since each component spins during both. Very odd symptoms indeed.

 

[lasershark]

Did you use the fwd flywheel with the AWD tranny?

 

[spyderdrifter]

If he did that, the starter gear teeth would clash with the flywheels ring gear teeth and potentially prevent start up. Although if this is the case and it breaks teeth off, it would create an imbalance, but the imbalance would be felt under deceleration too, and still those missing teeth gaps would eventually find their way back to the starter gear position and prevent starting.

 

[Mark4g63t]

Uhh don't think thats possible as they are different sizes.. Anyways my old flywheel was a ACT lightweight, now i'm on the stock one.
Yes it's a super weird situation. Going to try another driveshaft and if it's still there i'm taking the end cover off the trans and check the intermediate shaft for play.
Tranny guys chime in.

 

[98zx23369]

Can the center bearing on a dsm be in upside down? I know it can on a subaru. Sounds like the same thing that I ran into on a subi a year or so ago

 

[spyderdrifter]

That goes along with what I was getting at with the starter gear clashing. Yes they are different sizes, but they both fit in the trans case which leads to this suggested idea. Most of us know the difference, but there's still the noobs that over look it and fail as a result.

 

[lasershark]

Ok gotcha he just said "Stock flywheel and same pressure plate and disc as before" I know the FWD vs AWD flywheels are different but didn't know the specifics, good info!

 

[Mark4g63t]

Not sure new to AWD but I believe it can but don't think this trans has ever been opened up.

 

[Phantom DSM]

Not sure new to AWD but I believe it can but don't think this trans has ever been opened up.

Just to clarify..when you did the awd swap and swapped in the awd trans, did you reuse your original flywheel on your motor ?

 

[spyderdrifter]

Just to clarify..when you did the awd swap and swapped in the awd trans, did you reuse your original flywheel on your motor ?

He clarified that here

Uhh don't think thats possible as they are different sizes.. Anyways my old flywheel was a ACT lightweight, now i'm on the stock one.
Yes it's a super weird situation. Going to try another driveshaft and if it's still there i'm taking the end cover off the trans and check the intermediate shaft for play.
Tranny guys chime in.

 

[Tyeler18]

The FWD flywheel wouldn't physically fit the awd trans. It's too big to put the trans around it.

It sounds like you have a front CV axle issue. Accel only vibration is generally caused by a CV axle that is worn out. It may not be clicking though. How did you go about checking the front cvs? And does the steering wheel shake during the vibration?

 

[Mark4g63t]

^ Thank you!

 

[lil corb]

The FWD flywheel wouldn't physically fit the awd trans. It's too big to put the trans around it.

It sounds like you have a front CV axle issue. Accel only vibration is generally caused by a CV axle that is worn out. It may not be clicking though. How did you go about checking the front cvs? And does the steering wheel shake during the vibration?

I can see it causing the vibration but would that vibration reach all the drivetrain components like that? Like would his rear end be vibrating too?

 

[Mark4g63t]

Yea everything shakes, steering wheel, seat, front tires...
I physically took the cv axles apart. I did find a missing bearing but replaced it and it didn't make a difference.

 

[talontd92tsi]

I had a similar problem on my 1g once. Turned out that the used transmission that had an incorrect final drive for my t-case and rear end. I do remember there being something different between different 2g awd years. Perhaps this is your problem.

 

[Mark4g63t]

Trans is off a 96. So should be fine. Only the 97-99 are different.
Will grab the tranny code to be sure tho

 

[talontd92tsi]

What year is the tcase and rear out of?