Anyone know anything about a TH350?
 

I have one in my Chevy C10. I replaced the dip stick tube and now I have a massive leak. The tube came with a small O Ring which does not seem to be worth a crap.

I can lose all of the fluid in the torque converter overnight.

Being a Chevy, I'm hoping that this is a common problem with a simple solution.

some of them used a rubber sleeve type seal that pressed into the hole from the top and had a lip about 1/8 inch thick that the rib on the tube seated against. like this 700R4 700 4L60 4L60E TH350 TH400 2004R 4L80E 440 Dipstick Filler Tube Boot Seal | eBay

one thing to note.the tube will have a smaller diameter pipe on the bottom for this seal.if your tube is basically the same size clear to the bottom and has a groove for a seal this seal will not work.if thats the case i would say you either doubled the seal over or the tube has a crack in it.

Thanks, I guess I need to get another tube.