TH350 Blowing Fluid

SSGN · 01-19-2009, 09:46 PM

Thanks for the info Mark,muchly appreciated.We are looking at some changes over the winter and that is one of them.Have a good winter.

ss3011 · 01-19-2009, 11:16 PM

If you make the modification that Mark is suggesting, drill a hole through the dipstick tube just below the seal/o-ring that seals in the case. That will stop the straw effect, that could cause oil to spew out of the top of the dipstick tube. Also if you look at the early style, non locking dipstick, you will notice that the seal up by the handle has a notch in it. It also acts like a vent.

67ss · 01-20-2009, 08:43 AM

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.

Chad E532 · 01-20-2009, 10:52 AM

This has all been very good advice.
I am leaning towards the catch can idea since I can install that with the trans in the car still. If it still acts up I think the front pump will be replaced.
Thanks
Chad

01-19-2009, 09:46 PM	#1
SSGN Senior Member Join Date: Feb 2006 Posts: 644 Likes: 131 Liked 140 Times in 51 Posts	Re: TH350 Blowing Fluid Thanks for the info Mark,muchly appreciated.We are looking at some changes over the winter and that is one of them.Have a good winter.

01-19-2009, 11:16 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: TH350 Blowing Fluid If you make the modification that Mark is suggesting, drill a hole through the dipstick tube just below the seal/o-ring that seals in the case. That will stop the straw effect, that could cause oil to spew out of the top of the dipstick tube. Also if you look at the early style, non locking dipstick, you will notice that the seal up by the handle has a notch in it. It also acts like a vent.

01-20-2009, 08:43 AM	#3
67ss Junior Member Join Date: Jan 2008 Posts: 29 Likes: 0 Liked 0 Times in 0 Posts	Re: TH350 Blowing Fluid 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. __________________ Chad Harris 67 Chevelle SS http://mysite.verizon.net/harrisracing

01-20-2009, 10:52 AM	#4
Chad E532 Member Join Date: Jul 2008 Location: Lindstrom MN Posts: 156 Likes: 7 Liked 54 Times in 7 Posts	Re: TH350 Blowing Fluid This has all been very good advice. I am leaning towards the catch can idea since I can install that with the trans in the car still. If it still acts up I think the front pump will be replaced. Thanks Chad

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