t56 rattle at idle
04-30-2009, 11:51 PM
#1
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t56 rattle at idle Ive been reading a few older threads regarding the t56 idle rattle. I just bought my 01 ss (45k miles) and Im getting an idle rattle with the clutch out (not depressed). The noise goes away instantly when i press the clutch.
From the previous threads i have gathered that this is somewhat common with aftermarket clutches, but i bought my car from a dealer so I dont know if it's got an aftermarket clutch or not!
Other than the rattle at idle and low rpm take off (goes away around 2k rpm) the trans seems perfect, no grinding or popping out of any gears.
The noise does seem to be non existent at low rpm in 4th gear, which leads me to believe that this could be a main shaft issues since it seems to only occur in 1st thru 3rd.
The idle noise is noticeable from inside and outside the cabin (really only noticable if you are listening for it or expecting it when outside the cabin).
Just curious if anybody has some input, the car is still under state warranty so I am taking it in to be looked at but i want to be sure i know what im talking about before taking it in. Dont want to have them tell me its nothing and wind up having to drop some $$ into the trans in the near future, also i dont want to press a non-issue and have hte dealer waste time/money if its normal or no big deal.
Any input would be greatly appreciated!
From the previous threads i have gathered that this is somewhat common with aftermarket clutches, but i bought my car from a dealer so I dont know if it's got an aftermarket clutch or not!
Other than the rattle at idle and low rpm take off (goes away around 2k rpm) the trans seems perfect, no grinding or popping out of any gears.
The noise does seem to be non existent at low rpm in 4th gear, which leads me to believe that this could be a main shaft issues since it seems to only occur in 1st thru 3rd.
The idle noise is noticeable from inside and outside the cabin (really only noticable if you are listening for it or expecting it when outside the cabin).
Just curious if anybody has some input, the car is still under state warranty so I am taking it in to be looked at but i want to be sure i know what im talking about before taking it in. Dont want to have them tell me its nothing and wind up having to drop some $$ into the trans in the near future, also i dont want to press a non-issue and have hte dealer waste time/money if its normal or no big deal.
Any input would be greatly appreciated!
06-28-2019, 10:03 AM
#5
IDK about 2002 T56 but ones for the 94-97 cars there commonly was the "marbles in a can" sound at idle with clutch out in neutral. Noise went away once clutch was depressed and tranny in any gear. This was deemed as "normal"
Your sig notes a "Tick" trans...contact them about your concerns
Your sig notes a "Tick" trans...contact them about your concerns
06-28-2019, 11:13 AM
#6
TECH Addict
Its harmonics in the gear sets that are spinning with no load,, its the reason dual mass flywheels are the norm in European cars,
getrag transmissions are notorious for it.. The dual mass flywheel damps the crank firing pulses so it
doesn't rattle the gear engagement in the cluster gears. Basically your hearing the freeplay in the cluster gears.
This can also be a loose input shaft bearing on a higher mile transmission.
getrag transmissions are notorious for it.. The dual mass flywheel damps the crank firing pulses so it
doesn't rattle the gear engagement in the cluster gears. Basically your hearing the freeplay in the cluster gears.
This can also be a loose input shaft bearing on a higher mile transmission.
