white3800camaro

iTrader: (6)

I was pulling my transmission out to freshen it up some.

Noticed on top on the input drum there was a weird orfice.

On my other spares there is a different capsule with a check ball in it.


Also found a check ball capsule in my spare parts...



Not sure when/why it was put in.
Any input in appreciated!

mrvedit

It is the 3/4 clutch air bleed orifice. The idea is that air can escape before the hydraulic fluid seals the check ball and thereby can pressurize the 3/4 clutch.
Many performance builders will say that the check ball will unseat at high RPM (6000+ ??) and therefore create a major leak leading to 3/4 clutch failure. Therefore, some builders remove the stock orifice and replace it with a simple, much smaller bleed hole. The Transgo HD2 kit includes such an orifice. Another company makes a spring-loaded orifice, but in my measurements it was too big and could touch the reverse drum.

Hopefully this answers your question.

white3800camaro

iTrader: (6)

Thank you for the quick reply. It has been a while since I put the HD2 in (two years). So I did not remember that. I looked online for instructions and did not see anything about it.


Would you reconmend leaving it in?

Thanks

mrvedit

I could not tell from your pics which orifice you have in the drum now. Since several vendors make a high RPM orifice, I suspect it really is a problem and I would use something like the HD2 orifice. The fixed bleed hole is very small BTW, like 1/32". Even with such a small hole, I would recommend drilling the 3rd feed hole in the separator plate to at least .092 to provide extra fluid (part of the HD2 kit instructions too).
Where are you in MI? I am in Ann Arbor. I might have or be able to quickly get you a high RPM 3/4 orifice.
There are some other minor parts I would recommend too if you have your trans apart.

white3800camaro

iTrader: (6)

If it's from the HD2 I am sure it's that one. I will measure it, it is very small in the bottom. My seperator plate is already drilled out also