Transmission line leaking near exhaust

1998 Tacoma, automatic

I have a pretty bad transmission fluid leak on a line running down the right (passenger) side of the tranny right near the exhaust.... a friend of mine took a look under and said it was the transmission fluid return line and that it should be pretty easy to swap out but I can't seem to find any info online at all as far as parts or replacing/fixing...

Anyone familiar with what I am talking about?

 

Which part is leaking? There is a 90 degree (roughly) union that threads into the side of the transmission and connects to the inverted flare hard line. The part that is threaded into the transmission uses an o-ring to seal. The part that threads onto the hard line seals without anything extra since it is a flare fitting.

O-ring part number 90301-11006

If you need to replace the union, the one labeled as outlet is actually the inlet in toyota's system. I ordered the inlet part number, thinking I would get the return line union, but I actually got the outlet line union.

 

it seems to be leaking from the end of the 90-degree union that threads onto the hard line.

Does that means I need to replace the 90-degree union? do you know the part number or name? or is it just called the "90-degree transmission fluid return line union"?

 

is this the part?

90407-16009

https://www.worldoemparts.com/world...on-9040716009/?c=aT04NDE1MDYwNSZyPWxheWVyXzE1

obviously i'd use a new o-ring but is it recommended to replace the tube at the same time to be safe?

 

This is how toyota labels them (although your link is opposite)
Inlet – 90407-16012
Outlet - 90407-16009

The front union (the longer one) is the return line and is part number 90407-16009

If it is leaking at the hard line to union connection, you might be able to tighten it. If you do this I suggest using a brake line wrench.

The o-ring goes on the transmission side.

There is no telling if the hard line or the union is bad until you remove it.

 

Great. Thanks so much for the help!

 

POP a picture of the line where its leaking and post it up .

Lower in this thread , there is information for your transmission
https://www.tacomaworld.com/threads...sions-write-up-your-4-speed-automatic.325531/

 

there's a pic and here's a link to a video of the leak:

https://drive.google.com/open?id=0BylPy8OYXYaWV1EwOWJPNkNCNFk