Thread: Transmission Help

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I have a GM turbo 350 automatic transmission and need to know how to determine the the inlet trans cooling connection from the outlet. Does anyone know if the top fitting is the inlet or outlet?

Due to limited space and radiator capacity I intend on using a remote 12 pass Derale cooler with an inline fan thermostat.

jc

ive always used the top as the pressure and the bottom as the return, but after some checking its really the other way. when you get right down to it i dont think it makes no dif.

Originally posted by DennyW
I don't think it does either. The return is suppose to dump the cooler fluid over the clutch packs and drum. So, in theory, it's taking the hot fluid from the converter to the cooler.

the only dif. will be is the trans. fluid will flow from the bottom to the top in the cooler instead from the top to bottom, it will come and go in the trans like it all ways did.

if you wanted to change it all you need to do is switch lines at the cooler.

All, thanks for your responses.... The manufactur specs on the in-line thermostat specify that the thermostat must attaches to the inlet port of the cooler. This allows the automatic controller to activate the electric fan to maintain the coolent at 180 degrees.

(http://www.derale.com/fanmountedoilcoolers.shtml)

So back to square one is the upper or lower port the output (HOT) side of the trans?

jc

All, the final answer....from TCI TRANSMISSIONS

http://www.tciauto.com/tech_info/cooler_fittings.htm#GM

TH350, TH250

Fitting Location Thread Size Flow Direction

Upper 1/8” Pipe Return/in
Lower 1/8” Pipe Cooler feed/out


Thanks for your help

jc