I thought all the cool kids ran one? This is the race section right?? Actually I think “da rules” says we have to, either way I’ve experienced weepage at the vent with our 727 and 904. Tranz-act, Griner, Pro Trans…… all my brakes have done it in some manner. It does seem like ever since we went to the W8 mill the prob increased. I run a 47RE pan (727) or the 42RE pan on the 904 with the fluid just on the tip of the dipstick hot in N. My next race will be with the “new” 904 and that’ll have an A&A brake.

Next time it’s apart, use a A518 overdrive retainer gasket cut down, and punched for the holes, between the output shaft support and the case. Hot cross leak from the return flow, charging the vent cavity. You’re welcome.

Last year mine started showing temp when making runs with-in 30 minutes. Spit the sealed dip stick out. Shortly there after the converter imploded. Swapped the converter no issues since.
doug

I put my vent in the tail shaft housing and have never seen a drop out of it. I did make a little shield to go inside over the hole so the park gear can't sling oil on it.

That is a good point, maybe Chip's vents a little bit when he stands that big hemi powered beast up on the bumper for several hundred feet!

8sec...how did you make out with the trany leaking?

My trany still has the vent in the front of the pump so I too have some fluid dripping out the bellhousing now and then. Trying to figure out why too.

I haven't had the car back out since. Probably won't run it again until some time in the fall. I have a few things to change before I run it again anyway.

Chip, if it wasn't doing it before, the new vent location may be just fine.
FWIW, I ran the rear vent relocation also, and had no fluid coming out the vent. I did grind a little extra drainage in two locations on the rib below the new vent. But that rib should not seal to the gasket or the rear support (as cast), but I did add drainage so no fluid could accumulate in that cavity.

In my old race car, I found the 727 could be sensitive to a fluid level too low. Possibly due to fluid aeration if the bottom of the valve body is not covered. So go gently trying to reduce fluid level. If ET/mph drops, the trans could be aerating the fluid. It seemed strange at first, since the deep pan and filter extension will pull fluid from very low, no matter what the level.

That’s what I did on my case which looks like the one John Kunkel posted on the tail shaft removal post.I removed the webbing on the left side of that casting hump. No leaky.