CY & CX 400THM: differences & similarities

[nuch_ss396]

Try this for size:

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ebay search for THM tags

Nuch

[COPO 70 RS/Z28]

WOW,

Most of those are yellow, listed for lots of diff years!!!

Man ???

[jeff-san]

I am having an issue with my CX tranny...under partial to 1/2 throttle the Nova lights up the tires and shifts firmly into the next gear... but under heavy to full throttle around 5-6k I hear a slight squeal, then the tranny slips before it shifts into 2nd. I know it has and adjustable vacuum mod as I took a few pictures for Tom W...will an adj of this screw in or out fix this? any help out there?

[Mr70]

I don't think adjusting the Vac. Mod. will cure it,as it sounds more serious.
I had a similar situation and it was a clutch pack sticking.
It could also be a compression band that won't release.
1st check your fluid & filter for color & debris.

[mockingbird812]

Jeff - should it be more serious I have a friend who you could trust to fix your tranny. He is in my neighborhood, is a retired GM Proving Grounds Auto Tranny expert with beauceaup experience with 400s, and an excellent reputation. He has a complete shop on his property. Let me know. Good luck.

[jeff-san]

I may pull the tranny. when I bought it, I had all the fluids changed and a tune-up. the guy changed the tranny filter and althought the fluid was old he didnt notice any fragments from the clutch pack or metal in the pan. I may contact you about your tranny man. I have also heard good things about Mike's Trans in Lancaster, Ca. thanks for both of your imputs...I was trying to avoid pulling the tranny but I guess I cant get around it.

[Chevy454]

An easy check, and probably not the case (but learned by experience), make sure you have the correct pickup tube if it has a deep pan on it...doesn't sound like a modulator problem, sounds more like a hard part...but I'm no tranny guy by any means!