Rattle??

[30 PSI SHADOW]

I have noticed that my 568 with the clutch out and idling, i get a fair amount of rattling from the TOB. Should i be worried? how do i tell if the imput shaft? might be naking that noise. I know the TOBs are always noisy, but this seems to be a bit more than usual....

[Vigo]

Its probably not the throwout bearing. On all the fwd dodge manual trannies ive heard that noise on, when you push the clutch in just enough to put some pressure on the tob, the noise doesnt go away, but if you actually push in the clutch you can hear the noise go away as the shaft spins down to 0, indicating its internal.

[GLHS60]

I've had excellent sucess in eliminating the "rattle" by changing transmission fluid. While idling in neutral with the clutch engaged the input shaft is turning at engine speed along with the speed gears on the intermediate shaft, but not the shaft itself. Part of each synchro assembly is turning and part is not. Due to the design of the synchro's there is some free play in neutral and engine pulses are amplifying the free play and the result is the audible rattle. With the clutch disengaged there is a considerable reduction in engine pulses reaching the synchros but the throwout bearing often gets the blame. Production tolerences make some units more suceptable to noise than others and as the fluid viscosity lessens with age some units rattle more with lower viscosity fluid. I have experimented with various fluids over the years and have personally found it's possible to change transmission characteristics with different fluids. This "rattle" can be found in any manual transmission, not just ours.

Thanks
Randy

[turbovanman²]

I've had excellent sucess in eliminating the "rattle" by changing transmission fluid. While idling in neutral with the clutch engaged the input shaft is turning at engine speed along with the speed gears on the intermediate shaft, but not the shaft itself. Part of each synchro assembly is turning and part is not. Due to the design of the synchro's there is some free play in neutral and engine pulses are amplifying the free play and the result is the audible rattle. With the clutch disengaged there is a considerable reduction in engine pulses reaching the synchros but the throwout bearing often gets the blame. Production tolerences make some units more suceptable to noise than others and as the fluid viscosity lessens with age some units rattle more with lower viscosity fluid. I have experimented with various fluids over the years and have personally found it's possible to change transmission characteristics with different fluids. This "rattle" can be found in any manual transmission, not just ours.

Thanks
Randy

Yep, GM's 5 speed in trucks was notorious for that noise, customers would b*tch and moan, lol. My Grand Am also had it, the 282 trans, you get used to it,

[amcpacer]

What is a good fluid to quiet it down? GM syncromesh? I use 5W30 and can hear a little bit of rattle when standing outside the car on the driver side with my head near the front wheel.

[turbovanman²]

What is a good fluid to quiet it down? GM syncromesh? I use 5W30 and can hear a little bit of rattle when standing outside the car on the driver side with my head near the front wheel.

You could try SM, may or may not do anything. If you want to run thicker oil, that will stop it but then you affect your shifting.