Is there a rpm for the 4l80e where the clutches try to engage due to centrifugal force? Seems like I read that the 60's don't like real high rpms, so I'm wondering about the 80e before I choose some build stuff for my 6l.

 

None that I am aware of, complete different design.

 

ok so if i wanted to wing it to 6500rpm it would be fine?

 

Don't see why not, I will be taking mine to that and used to take my 65e to 6400 all the time but my 65e was built to do so.

 

If there isn't a hole drilled in the direct drum, you can centrifugally apply 3rd gear clutches while in 1st at a high RPM.

 

so the builder will probably need to know if your going to be turning a decent rpm? i never took my 60e over 6200 unless it missed a shift but then i had the tb close around 6300 just to be safe.

 

Heavier direct clutch return springs help combat this issue does it not?

 

They help, but many "race" transmission builders (who are experienced in th400s) already drill the direct drum bleed hole.

Edit: I guess it would make a difference if we are talking a stone stock transmission or one that is/has been rebuilt.

 

Either way these are things that are good to put out there. That way people will know not to just throw in a shift kit and go spin their motor to 7,000 and wonder why the Trans went. I just remember seeing it on a random thread years ago so I decided to ask.

I want to do the Holley intake on my 6L and I need a new cam, so I figured might as well get the cam to match the I take if the Trans can take it. I don't want 7,000 but 6500 would be ok.