Noisy T-56

[Trond Sundby]

Hi guys. Please help me out with this one.
I have a -03 GT with SC and a T-56 from a 2003 Cobra.
When first time installed it was quite noisy, especially when putting on som load in 4th gear. Kind of crushing/whining noise. Sounds like the gearbox is running without oil at all. Pulled the gearbox and a pro helped me rebuilding it. Though it was in good shape. Replaced the pilot bearing and TOB.Installed it all, just to find out the same noise still isn there.
From 1000-2500 rpm in 4th gear, it´s really crushing som gravel doen there. The same sound appears in every gear, but definitely worst in 4th.
Pulled it again, new tear down, changed all bearings, synchros and shims. By another pro mechanic. Installed new flywheel, pilot bearing, new clutch, pressure plate, release fork, pivot ball, TOB, TOB sleeve, u-joint in driveshaft, rear end is brand new. Absolutely every little piece between crankshaft and rear tires are new. Tried Castrol Dex III this time. And believe it or not.... the same noise is still there. It is loudest if I run the car a little hard, some WOT, driving fast for a while. In other words, when the gearbox is warm/hot. It is so loud when pushing it at low rpm i 4th gear, that I can´t hear the engine. Quite embarrassing to drive around...
Somebody know what tis can be? Please..

 

[hotcobra03]

noises can travel..
have you really checked rear wheel bearing?

wrong part used? part missing?

do you have a parts list for clutch,flywheel,fork,pivot..input shaft.

just saying they were changed isn't enough to go on..

 

[Trond Sundby]

noises can travel..
have you really checked rear wheel bearing?

wrong part used? part missing?

do you have a parts list for clutch,flywheel,fork,pivot..input shaft.

just saying they were changed isn't enough to go on..

noises can travel..
have you really checked rear wheel bearing?

wrong part used? part missing?

do you have a parts list for clutch,flywheel,fork,pivot..input shaft.

just saying they were changed isn't enough to go on..

I don´t actually have the part list with part numbers.
the flywheel is original Cobra
complete clutch kit, exedy. Including TOB, pilot bearing, pivot ball
Ford release fork. Original Cobra bell housing.
Some $1500 overhaul kit for the gearbox
Moser shafts and new bearings all over.

I´m starting to fear that the noise isn´t actually coming from the gearbox, but from the motor, and the noise is just being transferred through the box.
In worst case crankshaft. Though I cannot imagine why the sound is worst in 4th gear..

 

[hotcobra03]

this was a noise on mine..tob exploded causing fork to bang again transmission..very loud constant banging, would go away when foot was on clutch pedal slightly

can you make any of these sounds while sitting..or does it have to be moving?

only Strange noise I've had on engine was lower pulley bushings.sounded like valve tap tho.

 

[Trond Sundby]

Had a lot of noise from the old clutch. TOB, TOB sleeve and release fork were all damaged. Now with the new exedy clutch and all other parts new, it´s very nice and smooth. Not a sound from the clutch. I have the sound on a mov file, but don´t know how to attach it here..
The only thing I can possibly think of is if the input shaft isn´t 100% straight. Though it shouldn´t matter if the engine is warm or not.

 

[hotcobra03]

what happens when driving when you push clutch to floor.does noise stop,or can you make sound change when moving

 

[Trond Sundby]

what happens when driving when you push clutch to floor.does noise stop,or can you make sound change when moving

Engaging clutch, and everything is silent. Even if revving the motor. regardless speed, rpm, brake. Clutchpedal out and it starts. Not too bad when deceleration, but very bad when accelerating.

 

[Trond Sundby]

Changed oil and filter today, but no sign of metal in pan or filter.

 

[hotcobra03]

have you checked rear wheels again.

the axle is also splined in hub..

or even turning rear with out driveshaft attached..

It sounds like noise comes more under load..

hard to say
.you had been in transmission 2 times,than rear end rebuilt.

did you do any of the work?

motor mounts can cause noises under load..

try posting video to youtube..than share link..

 

[hotcobra03]

I have another thought..

you got t56 used..said to be from ford.

got blower used..was it from same person?

buying used is so hard..Story is always different..

I seen another thread on other site.of yours..

1st..did you do any of the work?

if not ,,can you do any type of mechanics?.

the sound you described in that thread made me recall a motor swap years ago..

pulled engine and transmission as 1..
installed new engine..reinstalled.

when going to put drive shafts back in..tail stock bushing wouldn't allow yoke to slide in..had to replace tail bushing..

but this is something..if to tight would make that noise you hear of no oil..whine..and louder under throttle..

a over tight rear pinion bearing will also whiNE the same way..

gm uses this t56..I haven' looked yet..but gm always used the turbo 400 yoke..

which I think is the same inner spline but different outer size than ford c6 yoke..

this is where it could be something to think about..bring t57 was used..

above stickys in talk..see read before you post..find cobra bobs links..

there is 5 in a section.

1 is for t56 manual..parts list for all t56,viper,gm,ford..
may find something to identify gm vs ford t56 by eye..

than..spicer..Dana.

you can open the slip yoke section.

it shows size of transmission yoke..

 

[hotcobra03]

I think Dennys driveshafts..

his Web site has both of these yokes with color pics,,and info on size

 

[Trond Sundby]

The T56 is from a 2003 Cobra (At least that´s what they said). Bought as a complete kit included pedals, yoke, driveshaft. As far as I know, this was pulled from a wreck.
SC is a complete kit. Vortech S2 with watercooled intercooler. Bought new and installed 5-6000 miles ago.
The gearbox has been overhauled two times in a few months, by professionals. Second time just to make sure evrything´s okay. Since the noise still was there. Changed bearings, synchro and shims. Rearend is rebuild by a professional abut 500 miles ago. I do lots of work on the car myself, but not overhauling gearboxes/engines or rebuilding rear end.
I turned wheels and rear end when I had the gearbox out. I couldn´t hear anything.
I´ll try to post the video somewhere. Perhaps I can use Facebook.

 

[Trond Sundby]

https://ww000694794w.youtube.com/edit?video_referrer=watch&video_id=7Cmook7V6fk

I managed..

 

[MOOS_23]

Check your clutch or throw it bearing. Could possibly be the bearing

 

[Trond Sundby]

Flywheel, pilot bearing, clutch disk, pressure plate, release fork, pivot bolt, adjustable wire, alu. quadrant, TOB and TOB sleeve are all brand new. Installed, checked, and checked again. Works perfect.

 

[Coosawjack]

Do you by chance have a transmission mount bushing installed....the ones that stiffen the OEM mount??

I installed a Steeda one in my 2014 GT and drove a 2 mile round trip to rip it out.......the noise on acceleration was RIDICULOUS!!

 

[Trond Sundby]

Transmission mount is stock Cobra 2003. Stil in one piece..

 

[hotcobra03]

link will not open..

 

[Trond Sundby]

You were right about that.. Try this one.

 

[pdube1]

My trans does the exact same noise. Two years ago I had it rebuilt, at that time, this noise was in 2nd gear during not that hard acceleration at low RPM. After the rebuild, the noise is now in 4th gear, still during not that hard acceleration at low RPM (<2100).

I don't know what is causing this noise, but for sure it comes from the trans.