My transmission lost it shift firmness and wasn’t acting right. I pulled it today and the front pump rotor drive teeth were sheared. It damaged my converter but my bigger concern is what went wrong here. I’m at 450rwhp on motor and 600 on nitrous. Is the pump rotor a weakness at my power level?

 

How much of a gap did you have Between the flywheel and the convertor when the convertor was full seated in the trans?

Is the convertor built for nitrous?

 

Converter Ballooned from nitrous-oxide use and broke your pump rotor...

 

l had about a 3/32” gap when I installed the transmission and converter. I know the pics aren’t real clear but you can see there was about 5/16” engagement from the marks in the slots of the converter hub. The converter is a yank ss3600.

 

When you mean it ballooned, do you mean sucked back essentially just enough to disengage off the drive teeth on the rotor then come back and sheet the teeth?

 

I talked to Yank Converters and they said the SS3600 is fine for the application.

 

If the rotor teeth were sheared your transmission would not move, shift or anything.

 

No I mean the converter grew larger (ballooned) and crushed the rotor.

 

I like to run .090" - .100" in NA applications. If NOS is involved, I like to keep the gap at .125" and that is with a anti-ballooning plate or similar setup. You can see there was maximum contact area (hub to rotor).

 

Is the maximum contact area a bad thing?

 

That is why I recommend the clearance that I stated. You want maximum rotor to hub contact if possible. in most cases, this does not happen, due to many things.

 

The OP has continued the discussion on a new thread:

https://ls1tech.com/forums/automatic...p-failure.html

Therefore I am closing this one.