TH350 Blowing Fluid

[67ss]

I've had this problem on a 350 and a 400. A new pump in the 400 fixed the problem which may likely be the same problem you are having. These old pumps get slightly worn/warped and casue fluid to bleed across the circuits as previously mentioned, but I also run a universal catch can made by CSR. We had the trans out so we pulled the plastic vent tube and just barely enlarged the hole for 1/4" copper tubing. Pushed tubing through and flared it so it would seat just like the plastic line. Also used a little JB weld to seal it. Then I just used some clear tubing from Lowe's from the trans to the can. The catch can comes with an 1/8" NPT snaplock type fitting but it was going to take a much larger hole to tap it for the fitting and there isn't much room there to drill in the 400 so we just opted for using the copper line.