i STILL have vibration. harmonic balancer? PLEASE help me

[fiveoho]

several of you guys helped me out during all this. for the guys that are new to the problem, heres the condensed version:

swapped out my T5 in my 95 for a 32k Cobra T5 from a 95. also swapped the flywheel and bellhousing. had the cobra flywheel resurfaced b4 the install. after the swap i had vibration. the vibration happens while sitting still with the clutch in or out, with the car in or out of gear. it worsens with rpm speed, or at least changes. also does it while driving.

since the vibration occurs sitting still ( driving also ), i should be able to eliminate the trans itself along with the driveshaft, universals, etc. the cluch is a centerforce and has less than 12k on it.

UPDATED PROGESS:

i ordered a NEW FRPP 50oz replacement flywheel and dowel/bolt kit and had a mechanic take out my resurfaced cobra flywheel and put in the new one. he said everything b4 hand was installed correctly. the new flywheel DID help but i still have some vibration. still happens while sitting still but worsens while driving up in the rpm's.

i have a new in the box FRPP 50oz balancer ( not the SFI one ). should i try replacing the stock one with this one? could this fix my problem?


thanks guys

 

[final5-0]

I'm wondering if it might be the clutch

Grady

 

[fiveoho]

I'm wondering if it might be the clutch

Grady

not saying its not the clutch, but what could be wrong with it or causing the problem?

 

[Black95GTS]

This may sound silly, but check your motor mounts.

Adam

 

[fiveoho]

when i put the tranny back, i put a energy suspension mount back on. could the factory rubber motor mounts and the poly trans mount not like each other?

 

[final5-0]

not saying its not the clutch, but what could be wrong with it or causing the problem?

The pp is bolted to the fw ... is it not

If it ain't in good balance ... its gonna be part of the mass when you
rev it up in neutral ... right

It didn't do this with the old tranny ... right

What all is different that could be causing the vibes

Just thinking out loud and trying to help

Grady

 

[fiveoho]

What all is different that could be causing the vibes

transmission, bellhousing, flywheel ( brandnew ), poly trans mount



*also replaced the pilot bearing

 

[fiveoho]

im not even sure the balancer is the culprit or will fix the problem but heres my philosphy:

since i have a brand new 50 oz flywheel and its installed properly and if i install a new 50 oz balancer, installed properly, then there should not be any chance or worries of damaging or hurting the motor if some vibration is still there. if the balancer and flywheel are new and known good and i still have slight vibration.....the vibration is not hurting my main bearings or anything of that nature? it would be caused by something else, correct?

 

[final5-0]

I saw your other thread about HB's that is now currently running btw

I gotta think if you used the same clutch and it didn't vibe before ...

The clutch ain't the prob

Also ... don't make sense your known good HB from before this
project would all of a sudden ... just go bad

Adam has a good idea about checking all items disturbed from the
project for tightness.

That more dense trans mount might allow more NVH to be felt

Are the vibes a good bit more noticeable with this new trans

I wonder ... is your fw one of those units that has different weight
otpions

I don't know ... hope it is not something in your new trans

Grady

 

[HISSIN50]

I'm leaving the heavy hitting to Grady and others, but had one question:

Were the flywheel dowel pins reinstalled?

Was the flywheel checked for balance after being turned?

New or machined doesn't always = 'good to go'.

I did do a lot of research about poly engine and trans mounts before I bought mine and quite a few 94-95 guys (not fox III's for some odd reason) have a bit of vibrational issue with poly. That's neither here nor there, but since Grady brought it up........ it was also something I initially thought of.

Do you have reason to believe there is an indexing issue with the new trans?

Just thinkin aloud (sorry, that was more than one thought. ). I'll look for the other thread.

Good luck.

 

[blksn955.o]

Buddy of mine put a t56 in his 97cobra not too long ago and had a fidanza FW and centerforce clutch to install as well. He found out after install it had a BAD vib. he called centerforce and found that the PP has a ball. to work with his FW...something to do with what bolt patt. he used with an 11in clutch. He had to pull the t56 and re-do the PP. Vib. is gone.

I would check the HB as well...its ALOT easier to check that, and quckier as well than pulling the trans.

 

[fiveoho]

guys- i really appreciate the responses and help. i just got home from swapping out the HB ( done the radiator too...old one was leaky ). i gotta say, i was intending on doing the new HB simply for piece of mind and just to rule it out. low and behold, it actually helped a good bit. the car is a little smoother now and the vibration is less. i do think and hope that if i take the poly trans mount off and put a rubber one back on that my vibrations will go away. i hope anyway.

the HB that came off really didnt look terrible. wasnt really any rubber hanging out but judging by all the rust, i think it had been there a while.

grady, you mentioned you hope it wasnt my tranny. well, you and i BOTH hope its not. but if the vibe starts while sitting still ( which is much better now ) and not moving, could that point to the tranny not being the problem?

 

[final5-0]

grady, you mentioned you hope it wasnt my tranny. well, you and i BOTH hope its not. but if the vibe starts while sitting still ( which is much better now ) and not moving, could that point to the tranny not being the problem?

Its good to see you have made some progress

I must admit I don't know a lot about the workings of the t-5

Does anything turn in the tranny while in neutral
I kinda think the main shaft does

However ... What ever turns with the motor in neutral is suspect
to not being in balance.

Grady

 

[fiveoho]

Its good to see you have made some progress

I must admit I don't know a lot about the workings of the t-5

Does anything turn in the tranny while in neutral
I kinda think the main shaft does

However ... What ever turns with the motor in neutral is suspect
to not being in balance.

Grady

thanks grady!

i am glad the balancer helped. i think after i change the trans mount back to rubber, that will help also.

i also wondered about the t5 spinning while sitting still.....wondered if things turned too.


the balancer install:

i didnt HAVE to but we grinded some off the bottom of the water pump. i thinking i wouldnt have to with the FRPP replacement HB but it was too close to me. i could slide one credit card between the pump and the HB. after my buddy grinded on it for a while, two credit cards fit

 

[xkuntrycowboyx]

I have a question... i thought you said you used the cobra flywheel... is it a different weight than the gt, causing an inbalance there ???

..Just a thought, i don't know much bout this stuff but thought i'd throw it out there.

 

[fiveoho]

I have a question... i thought you said you used the cobra flywheel... is it a different weight than the gt, causing an inbalance there ???

..Just a thought, i don't know much bout this stuff but thought i'd throw it out there.

i thought the same thing. and if you research it ( even some posts on here ), you will find that the cobra flywheel is "lightened". some guys say yes , some say no. my understanding of it is that even IF lightened, the imbalance is still the same on both - 50oz. places like autozone has the same part number for a cobra and gt flywheel

 

[fiveoho]

when i change out the poly trans mount with the rubber one, can i do so without dropping the tranny again? please tell me i can.

 

[HISSIN50]

when i change out the poly trans mount with the rubber one, can i do so without dropping the tranny again? please tell me i can.

You'd have to drop the engine or the trans............

Or just be able to support the trans while you swap mounts. It will take 5 minutes or so, unless a bolt won't line up. It's easy though.

Good luck.

 

[fiveoho]

You'd have to drop the engine or the trans............

Or just be able to support the trans while you swap mounts. It will take 5 minutes or so, unless a bolt won't line up. It's easy though.

Good luck.

so i can just unbolt the crossmember and cradle it with a jackstand while leaving it in the car

 

[HISSIN50]

The last one I did was on the fox and I didnt even touch the crossmember. I just carefully used a jack to support (and slightly raise) the trans while I was R/Ring the mount. Took but a few minutes.

Good luck.