LT1 6 spd trans
Team Owner
Joined: Sep 2003
Posts: 25,383
Likes: 2,736
The curious aspect regarding the replacement is "if the single-mass was installed" was the "sprung disc" installed to finish the job. If it was an off the shelf package for the clutch we could almost assume that it was installed with an un-sprung disc. Like I mentioned there's way to many questions to be answered before just blaming the trans and mentioning rebuild or replacement.
Le Mans Master
Joined: Jul 2000
Posts: 7,635
Likes: 326
From: Greenville SC
Describe the sound more, is it a clunk sound or what?
I have a SM FW, and at idle, clutch out, if low idle 700 or less, it sounds terrible. I have been told by several mechanics, and other people I need a new this and that, and have to explain it is because of a SM FW etc and it has been that way for years and no issues. Raise the idle to 900 + and it goes away, I have heads cam so better for mine.
Mine will clunk in 6th if low rpms and under load, 1500 is fine though, and that is more like 65mph. You can feel it, I try not to let it do it, I think it is play in the rear drive line, and clunks back and forth when power is applied or removed.
I have a SM FW, and at idle, clutch out, if low idle 700 or less, it sounds terrible. I have been told by several mechanics, and other people I need a new this and that, and have to explain it is because of a SM FW etc and it has been that way for years and no issues. Raise the idle to 900 + and it goes away, I have heads cam so better for mine.
Mine will clunk in 6th if low rpms and under load, 1500 is fine though, and that is more like 65mph. You can feel it, I try not to let it do it, I think it is play in the rear drive line, and clunks back and forth when power is applied or removed.
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
The curious aspect regarding the replacement is "if the single-mass was installed" was the "sprung disc" installed to finish the job. If it was an off the shelf package for the clutch we could almost assume that it was installed with an un-sprung disc. Like I mentioned there's way to many questions to be answered before just blaming the trans and mentioning rebuild or replacement.
Having done this this spring, with a lightweight Spec steel flywheel and the Carolina Clutch sprung disc, I can attest to some rattle when 'lugging' at low rpms. I also have a good amount of gear rattle at idle in neutral. It's just the nature of the beast. I really doubt that there is an issue with the transmission itself. This gear rattle is the very reason GM went with the dual mass in the first place.
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
Describe the sound more, is it a clunk sound or what?
I have a SM FW, and at idle, clutch out, if low idle 700 or less, it sounds terrible. I have been told by several mechanics, and other people I need a new this and that, and have to explain it is because of a SM FW etc and it has been that way for years and no issues. Raise the idle to 900 + and it goes away, I have heads cam so better for mine.
Mine will clunk in 6th if low rpms and under load, 1500 is fine though, and that is more like 65mph. You can feel it, I try not to let it do it, I think it is play in the rear drive line, and clunks back and forth when power is applied or removed.
I have a SM FW, and at idle, clutch out, if low idle 700 or less, it sounds terrible. I have been told by several mechanics, and other people I need a new this and that, and have to explain it is because of a SM FW etc and it has been that way for years and no issues. Raise the idle to 900 + and it goes away, I have heads cam so better for mine.
Mine will clunk in 6th if low rpms and under load, 1500 is fine though, and that is more like 65mph. You can feel it, I try not to let it do it, I think it is play in the rear drive line, and clunks back and forth when power is applied or removed.
So, when starting from a stop, you need to raise the normal rpm of the motor more before releasing the clutch, or when accelerating in 6th gear, either accelerate more slowly, or downshift until you reach the desired speed.
