LT1 Flexplate balancing question
Thread Starter
Le Mans Master
Joined: Jan 2000
Posts: 6,595
Likes: 1
From: Thornton CO
LT1 Flexplate balancing question
I pulled my transmission because I was having problems with it (only 6,000 miles on it) and found that the flexplate bolts had backed themselves out and lodged against the torque converter. Since the plate was loose it was able to move and the holes are now out of round. I have a 383 that I know was internally balanced but I also believe that it was balanced as a whole with the factory flexplate. Long story short, I had replaced the factory one with a new SFI approved one and had it balanced to match the factory one and I no longer have the factory one.
Can I run a "neutral balance" flexplate or do I need to get a new externally balanced one and have someone try and balance it to match the bad one that I have?
Can I run a "neutral balance" flexplate or do I need to get a new externally balanced one and have someone try and balance it to match the bad one that I have?
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
I pulled my transmission because I was having problems with it (only 6,000 miles on it) and found that the flexplate bolts had backed themselves out and lodged against the torque converter. Since the plate was loose it was able to move and the holes are now out of round. I have a 383 that I know was internally balanced but I also believe that it was balanced as a whole with the factory flexplate. Long story short, I had replaced the factory one with a new SFI approved one and had it balanced to match the factory one and I no longer have the factory one.
Can I run a "neutral balance" flexplate or do I need to get a new externally balanced one and have someone try and balance it to match the bad one that I have?
Can I run a "neutral balance" flexplate or do I need to get a new externally balanced one and have someone try and balance it to match the bad one that I have?
Because is should either be internally balanced or balanced with the factory flex plate not both.
If it was internally balanced and your running a factory balanced flexplate, that could be the cause of the bolts backing out.
Mike
Mike
Mike
Thread Starter
Le Mans Master
Joined: Jan 2000
Posts: 6,595
Likes: 1
From: Thornton CO
I guess that's what I need to find out. I know that the factory flex plate didn't have anything new on it when I got everything back. Isn't there a gm standard balance or something like that?
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
If the bad SFI one you have has no weight fitted it would be reasonable to assume it is a neutral balance one and any off the shelf flexplate would replace it.
Internal balance is just that ; all the balancing is done inside the engine allowing the use of a neutral flexplate and harmonic balancer.
Internal balance is just that ; all the balancing is done inside the engine allowing the use of a neutral flexplate and harmonic balancer.
