My TH400 Pissing Fluid

Krazybones

Club Member
Thank goodness it happened 1/2 mile from my house but anyway

Shifted a little hard from 1st to 2nd and felt a slip (I think a slip anyhow).

Suddenly was the nice pretty white smoke from Trans Fluid dumping out the bottom all over my headers and on the road. I shut it right down and pulled right over (smoke everywhere). Let it sit for a few minutes as I checked everything out. At that time I could not tell where it was coming from as it was coated all underneath on everything as I do not run an Inspection cover. Seeing I was a 1/2 mile from home I limped it back real slow as it still shifted perfectly from what I could tell. Reverse is there, second and 3rd are there (Not sure about 1st). But On the way home I did not get over 20 mph, bet yeat was in a hurry to just get it in the Garage and shut it down.

Hard lines are good, speedo connection good, Dipstick is good, Pan looks good, etc...

Very Hard to tell, but it appears to be coming out of where the Converter shaft slips in. Converter is a TCI 3000 with Stall. (Forget what model)

Before I pull it, any ideas.... Converter went bad, Just a possible Seal, or do you think the trans is toast?

This trans was totally gone trough about 7 years ago and beefed to handle 500-600hp and I would guess it has no more than 3000 street miles on it and has always worked perfectly.
 
Brand new Aluminum Radiator as of last year being used. Worked great last year and the little I used it this year.

I am hoping it is just a seal, but I know a lot of people hate TCI converters if it is that. I am just hoping the trans is all together.
 
I'd imagine its something small (well, not a big issue...either way the trans has to come out :punchball). You said it seemed to drive fine on the way home. I doubt it would do that and still have all its gears it it was something major.
 
Does it have a known brand shift kit? If the shift kit changed the line pressure schedule, then that is most likely your issue. High line pressure works against that seal if not done correctly. But could have been a inexpensive seal to begin with and just failed over time.
 
You really need to crawl underneath and locate the exact source of the leak.
If its coming from the front pump area there are many possibility's.
Cracked weld on the converter, loose pump bolts, spun pump bushing-which can be caused from missing block alignment pins/worn block pin holes in the case/crooked hub on the converter/bad flywheel/misalignment from one of those junk jw bolt on bell housings. Most transmission builders use some form of additional adhesive to help retain the press fit and ease the installation of the seal.
 
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