TH 350 Transmission Return Line

[magik235]

My TH350 transmission recently started slipping. I pulled the tranny for a rebuild. I installed a transmission cooler today. I am making new cooler lines. I have searched and read lots of posts but the information is conflicting. I need to know what is the return line on a TH350. Is it the top fitting on the transmission or the bottom one?

The information below is from TCI Transmissions at http://www.tciauto.com/Products/TechInfo/cooler_fittings.asp

TH350, TH250
Fitting Location ..... Thread Size ..... Flow Direction
Upper .......................¼" Pipe ............ Return/in
Lower .......................¼" Pipe .............Cooler feed/out

 

[toomany]

I believe the upper of the two fittings is the return. The bottom one feeds the cooler in the radiator. The return is the top one. I've been told it was done this way to prevent a "waterfall" effect in the cooler.

 

[Greg Ducato]

Top is the return line on the 350.

 

[4xcrazy]

it says which is which in the information above the first picture you posted...