This is topic New problem with new tranny(D.Starkey can you join in here?) in forum Tech Talk at Northern California Ford Owners  .


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Posted by roseville5oh (Member # 406) on :
 
I just swapped in my new tremec 3550 over the weekend. All I changed was the tranny and the bellhousing. I left the clutch, flywheel and everything else alone. I took the car out and the new tranny feels great, until i hit around 3000 rpm. From there on up i get a nasty vibration until about 4000 rpm and it starts to go away a little bit. What could be causing this to happen? This didn't happen before with my T-5. Anyone have ideas?
 
Posted by cobraman_1994 (Member # 467) on :
 
mabey they mishandled the tranny on delivery. thats probably not what you want to hear, but its a possibility [Frown]
 
Posted by roseville5oh (Member # 406) on :
 
i thought about that, but I don't think thats possible. The tranny was boxed very well, and showed no signs of damage upon delivery. It's got to be something else.
 
Posted by cobraman_1994 (Member # 467) on :
 
did everything line up correctly? [Confused]
 
Posted by PunkINa5.SLOW (Member # 10) on :
 
Doesnt the Tremec require a different front yoke?

Just sounds like a geometry issue to me assuming all hard parts or either new or in good shape.
 
Posted by roseville5oh (Member # 406) on :
 
quote:
Originally posted by PunkINa5.SLOW:
Doesnt the Tremec require a different front yoke?

Just sounds like a geometry issue to me assuming all hard parts or either new or in good shape.
Only the TKO requires a different yoke. Thats what's killing me, it didn't do it with the other tranny, and it ONLY happens between 3k-4k rpms, it's perfectly smooth below that especially. Could it be the throwout bearing not aligned?
 
Posted by PunkINa5.SLOW (Member # 10) on :
 
I doubt it is the T/O bearing

Do you have a manual fan?

Did you make sure there is some weird probs with the fan hitting the shroud?

This happened to me after a C-4 swap cause the trans mount move the front of the motor down a tiny bit caused the fan to hit the shroud and make a weird little vibe.

Other than that does it do it in neutral at a complete stop or only when you are in gear with the car rolling???
 
Posted by roseville5oh (Member # 406) on :
 
i've got an electric fan. Just to eliminate accessories, i pulled the belt and fired it up and the vibe was still there. It happens in all gears, seems worse as i go higher in gears. I can feel it in neutral, though it's not as bad as when I'm in 2nd or 3rd. It'll make the vibes in neutral, in gear with the clutch pedal to the floor, rolling, or standing still.
 
Posted by cobraman_1994 (Member # 467) on :
 
is it just when the clutch is in or not. that could be the prob
 
Posted by roseville5oh (Member # 406) on :
 
clutch in or out, rolling or standing still it does it no matter what. It is amplified as I go higher in gears. So, in neutral its not bad, cruising in 2nd at 3500 is bad, 3rd at 3500 is worse, and so on.
 
Posted by cobraman_1994 (Member # 467) on :
 
mabey the driveshaft or your gears? i dont know [dance]
 
Posted by roseville5oh (Member # 406) on :
 
quote:
Originally posted by cobraman_1994:
mabey the driveshaft or your gears? i dont know [dance]
i don't think that could be it becuase the vibe is RPM dependent. And also, it does it when the car is not moving, so that rules out the DS and gears. But, i have no idea what it is at this point still.
 
Posted by PunkINa5.SLOW (Member # 10) on :
 
How does your dampner look?

Still sounds like a geometry issue.

Id pull the trans and have a look at everything.
 
Posted by jph331 (Member # 665) on :
 
The tremec tranny needs to be spaced higher for correct geometry between the trans and rearend. Driveline service of concord can set this for you.
Also as far as vibration when not moving the only thing I can think of would be a bad input bearing or bad clearance's within the transmission or maybe the bellhousing and tranny aren't line up correctly.
 
Posted by roseville5oh (Member # 406) on :
 
quote:
Originally posted by jph331:
The tremec tranny needs to be spaced higher for correct geometry between the trans and rearend. Driveline service of concord can set this for you.
Also as far as vibration when not moving the only thing I can think of would be a bad input bearing or bad clearance's within the transmission or maybe the bellhousing and tranny aren't line up correctly.
I thought the driveline only needed to be modified with a TKO? I'll swap in 93 ponys 3550 if he'll let me:) just to eliminate the tranny as being the problem. Maybe it is an alignment issue, i don't think there's much adjustment is there? Or do i need to play with the bellhousing too?
 
Posted by T-TopTerror (Member # 480) on :
 
Hey -
It's obviously a tranny issue. Questions:
~Do you need to put a diff. pilot bearing in???
~Did you replace the throw-out bearing???
~Does the vibration get significantly worse the faster you go???

Honestly it sounds like the main shaft of the tranny might not be perfectly staight. Just a bad tranny in my eyes. Call TTC and send that sucka back. Another new one wouldn't be bad just time consuming.
 
Posted by roseville5oh (Member # 406) on :
 
i've been on Corral and heard that a few other people are experiencing this same problem. From what i heard, some people's DS yokes are bottoming out in the tailshaft housing, not sure if that would cause a vibe. though. Also, there is the rubber donut on the tailshaft that I was supposed to take off, so I will do that to see if it helps.
 
Posted by T-TopTerror (Member # 480) on :
 
When you do that check for scaring on the yoke. This will be the first indication.
 




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