th350 Trans Oil Lines - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Big Fenders · 07-29-2009, 12:13 PM

Hooking up my trans cooler and need to know which is return line and which is output line? Getting closer to firing this motor up and now doing all the small things.
Bob

MacAttack · 07-29-2009, 12:35 PM

TH350, TH250

Fitting Location Thread Size Flow Direction

Upper ¼" Pipe Return/in

Lower ¼" Pipe Cooler feed/out

http://www.hotrodders.com/forum/th35...es-140493.html

Mac.

**ScottH** · 07-29-2009, 01:56 PM

This may be a dumb question, but what difference does it make? Don't they both go to the radiator, and why should the position on the radiator make a difference (straight through isn't it)?

MacAttack · 07-29-2009, 02:08 PM

Quote:

Originally Posted by ScottH

This may be a dumb question, but what difference does it make?

Thought the very same thing - and I'll bet it doesn't. The radiator I bought had "inlet" and "outlet" stamped next to the fittings and the only way I got it straight was one hard-line had a huge switch-back bend in it, and it would only go to the fitting on the passenger side of the radiator.

Seems to be a lot of hooey.

Mac.

Big Fenders · 07-29-2009, 03:45 PM

Why directional? The trans thermostat that I'm installing has to be mounted according to in/out. Thermostat opens at either 180 or 190 degrees. This thermostat prevents the trans oil to get too cool and give shift problems.
Notice I'm from Arizona and its a little silly to think that anything gets "too cool" especially this time of year but this truck will spend most time in the mountains where it does get cool.
Thanks for the help
Bob

**ScottH** · 07-29-2009, 05:48 PM

Thanks guys, always learn something new on this board.

07-29-2009, 12:13 PM	#1
Big Fenders Registered User Join Date: Mar 2008 Location: Tucson Arizona Posts: 264	th350 Trans Oil Lines Hooking up my trans cooler and need to know which is return line and which is output line? Getting closer to firing this motor up and now doing all the small things. Bob Attached Images

07-29-2009, 12:35 PM	#2
MacAttack 283 Drama Queen Join Date: Dec 2004 Location: Surf City, CA Posts: 2,435	Re: th350 Trans Oil Lines TH350, TH250 Fitting Location Thread Size Flow Direction Upper ¼" Pipe Return/in Lower ¼" Pipe Cooler feed/out http://www.hotrodders.com/forum/th35...es-140493.html Mac. __________________ For about 12 years of my adult life I had a severe speech impediment. My ex-wife never let me get a word in edgewise.

07-29-2009, 01:56 PM	#3
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Re: th350 Trans Oil Lines This may be a dumb question, but what difference does it make? Don't they both go to the radiator, and why should the position on the radiator make a difference (straight through isn't it)? __________________ 1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon

07-29-2009, 03:45 PM	#5
Big Fenders Registered User Join Date: Mar 2008 Location: Tucson Arizona Posts: 264	Re: th350 Trans Oil Lines Why directional? The trans thermostat that I'm installing has to be mounted according to in/out. Thermostat opens at either 180 or 190 degrees. This thermostat prevents the trans oil to get too cool and give shift problems. Notice I'm from Arizona and its a little silly to think that anything gets "too cool" especially this time of year but this truck will spend most time in the mountains where it does get cool. Thanks for the help Bob

07-29-2009, 05:48 PM	#6
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Re: th350 Trans Oil Lines Thanks guys, always learn something new on this board. __________________ 1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon



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