Whats this noise from my transmission?? VIDEO

**Ls1_385hp_T/A** · 05-19-2011, 07:06 PM

Alright, so earlier this week I made a post asking if my engine or transmission mounts were bad. The shift knob moves about 1" as I accelerate and goes back to its position as it decelerates.. all the same from 1st to 6th gear. Also when engaging in 1st gear there is a slight grinding/clunky noise and the cabin vibrates. (In neutral there is no noise). Most posts said it would be my transmission and possibly engine mounts, I agreed.

Today, I lifted the car completely off the ground to check everything out. The transmission mounts looked damn near brand new!! So out of curiosity I turned on the car, put it in 1st gear, and let it free-wheel. There's a loud clunky noise coming from the back of the transmission when in gear. I tried them all and it made strange noises. Its vibrating everything down there!

Here is a video of the noise. Anybody know whats wrong with it?? Again there is no noise in nuetral, only when its in gear. This was 1st gear free-wheeling. HELP lol

[ame]http://www.youtube.com/watch?v=1HtN6JKzkMM[/ame]

**98maro** · 05-19-2011, 07:11 PM

time to rebuild the trans... how many miles on the car??
does it shift fine? clutch feels funny??

**Ls1_385hp_T/A** · 05-19-2011, 07:16 PM

Originally Posted by 98maro

time to rebuild the trans... how many miles on the car??
does it shift fine? clutch feels funny??

Has about 76k miles. Clutch is good and shifts fine when driving ..but its making that noise in 1st and 2nd gear mostly and when decelerating.

**98maro** · 05-19-2011, 07:21 PM

Originally Posted by Ls1_385hp_T/A

Has about 76k miles. Clutch is good and shifts fine when driving ..but its making that noise in 1st and 2nd gear mostly and when decelerating.

something could be lose in there,, i dont think its broken or anytihing cuz u wont be able to shif on those gears,, what you have to do take it to a shop and have them open it.. is not cheap..

awhile ago i was gonna buy an m6 that 2nd gear was locked the my mechanic said that on those transmission it was a comun problem.. idk if thats true,,

what part of north cali u at?

**Ls1_385hp_T/A** · 05-19-2011, 07:47 PM

Originally Posted by 98maro

something could be lose in there,, i dont think its broken or anytihing cuz u wont be able to shif on those gears,, what you have to do take it to a shop and have them open it.. is not cheap..

awhile ago i was gonna buy an m6 that 2nd gear was locked the my mechanic said that on those transmission it was a comun problem.. idk if thats true,,

what part of north cali u at?

Im in the Pittsburg/Brentwood area. It mostly sounds like its rattling.. and yeah since all the gears shift fine I think there has to be something loose..

**98maro** · 05-19-2011, 08:06 PM

Originally Posted by Ls1_385hp_T/A

Im in the Pittsburg/Brentwood area. It mostly sounds like its rattling.. and yeah since all the gears shift fine I think there has to be something loose..

your kinda far from me.. there is a shop here where they can check it out but im in redwood city ca
if something is losse in there i woundt drive till is fixed you could mess it up more

**My00Z28** · 05-19-2011, 08:43 PM

if i were to guess. its probably your first and second synchronizer u said it only makes the noise in first and second gear and there is only one synchronizer that controls them! u may have a broken key spring in the synchro that holds your synchro keys in place... if a blocker ring was broken the car would not shift at all! or if it did it would grind... bearings are also in the factor but u would hear noise in 1,2,3,5,&6 gears depending on what bearing it is you could also hear it in 4th aswell!

**My00Z28** · 05-19-2011, 08:51 PM

Originally Posted by 98maro

something could be lose in there,, i dont think its broken or anytihing cuz u wont be able to shif on those gears,, what you have to do take it to a shop and have them open it.. is not cheap..

awhile ago i was gonna buy an m6 that 2nd gear was locked the my mechanic said that on those transmission it was a comun problem.. idk if thats true,,

what part of north cali u at?

most of the time a tranny that is locked in any gear is due to an over shift where the synchro sleeve moves too far off of the synchro hub causing the key to lift from under the sleeve!!

here is a picture to help u under stand.

**Ls1_385hp_T/A** · 05-19-2011, 09:44 PM

Originally Posted by My00Z28

if i were to guess. its probably your first and second synchronizer u said it only makes the noise in first and second gear and there is only one synchronizer that controls them! u may have a broken key spring in the synchro that holds your synchro keys in place... if a blocker ring was broken the car would not shift at all! or if it did it would grind... bearings are also in the factor but u would hear noise in 1,2,3,5,&6 gears depending on what bearing it is you could also hear it in 4th aswell!

The sound was in all gears when it was jacked up and freewheeling. But when not jacked up and driving it is only noticeable in 1st and 2nd. It rattles in low speeds and shakes the whole car at 1500-2500 rpm in second gear. The gears all shift fine..nothing stuck or hard to get into. I dont know wth is wrong with it

**My00Z28** · 05-19-2011, 10:18 PM

Originally Posted by Ls1_385hp_T/A

The sound was in all gears when it was jacked up and freewheeling. But when not jacked up and driving it is only noticeable in 1st and 2nd. It rattles in low speeds and shakes the whole car at 1500-2500 rpm in second gear. The gears all shift fine..nothing stuck or hard to get into. I dont know wth is wrong with it

if it does it in all gears it could be the input shaft bearing or the main shaft bearing one on each side of the tranny and one at the end of the tail housing... how is reverse?

here is a manual for the t-56 http://www.ttcautomotive.com/English...ice_Manual.pdf
if you look on page 2-3 u will see the main shaft and the counter shaft...
number 9 & 42 (and number 77 on page 2-2 is the 3rd bearing which is not tapered!)are both tapered bearings for every gear no matter what gear it is power MUST go through them! if one of them were to fail(seriously) you would get noise in every gear. if it were just first and second gear i would point to the synchro number 30... you also have 2 bearings(numbers 104 and 106) on the counter shaft which would only make noise under a load which would be 1st 2nd and 3rd gear. 4th gear is straight through which is controlled by number 14 synchro. 5th 6th and reverse are in the tail housing which im sure u are catching what im explaining!... noise through every gear

also how is your clutch? u have bearings up there as well and could have a warped flywheel or something.

**My00Z28** · 05-19-2011, 10:21 PM

also check out page 1-3 for trouble shooting help!

**Ls1_385hp_T/A** · 05-19-2011, 10:59 PM

Originally Posted by My00Z28

if it does it in all gears it could be the input shaft bearing or the main shaft bearing one on each side of the tranny and one at the end of the tail housing... how is reverse?

here is a manual for the t-56 http://www.ttcautomotive.com/English...ice_Manual.pdf
if you look on page 2-3 u will see the main shaft and the counter shaft...
number 9 & 42 (and number 77 on page 2-2 is the 3rd bearing which is not tapered!)are both tapered bearings for every gear no matter what gear it is power MUST go through them! if one of them were to fail(seriously) you would get noise in every gear. if it were just first and second gear i would point to the synchro number 30... you also have 2 bearings(numbers 104 and 106) on the counter shaft which would only make noise under a load which would be 1st 2nd and 3rd gear. 4th gear is straight through which is controlled by number 14 synchro. 5th 6th and reverse are in the tail housing which im sure u are catching what im explaining!... noise through every gear

also how is your clutch? u have bearings up there as well and could have a warped flywheel or something.

Right on man, appreciate the help! Im checking it out.