Th400 Cooling Lines Team Chevelle 871 posts · joined 2010. #4 · mar 11, 2013. lower port on cooler. you want the hot fluid to rise to the top of cooler. then return to your trans. 1999 trans am ws6. virginia speed built lsx 418. th 400 & 5600 stall. mwc fab 9, and alot more bs. Correct routing: run the trans bottom pressure line to the bottom fitting of the radiator. the top line exiting the rad should be routed to the bottom line of the external cooler, read it stops (aeration), then route the coolers top return line back to the trans top inlet. basically bottom to bottom and top to top in theory.
Th400 Cooler Lines Diagram C3 tech performance th400 transmission cooler line routing 1970 454 kindly help. standard copper radiator fitted; does the top cooler line outlet on the transmission connect to the top of the radiator, and bottom outlet to bottom of radiator, as its not clear from the diagrams i have seen. Just as the heated coolant flows into the top of the radiator. after flowing through the transmission cooler towards the bottom of the radiator (where it is coolest) it returns to the th 400's top fitting (inlet). other chevy trans may flow differently. frankie. Stick with the factory brass fittings and get the inverted flare to 6an that fits into those. the factory thread in the case doesnt have the pipe thread taper. if you run a pipe threaded fitting into it you can or most likely will crack the case. 78 malibu classic factory 4 speed. 87 grand national. Cooler feed out i just had my th350 rebuilt and was told the feed goes to the top of the radiator and the return goes to the bottom. the reasoning was the radiator is cooler at the bottom. i made new lines and installed a cooler when i installed the tranny.
Th400 Transmission Parts Diagram Stick with the factory brass fittings and get the inverted flare to 6an that fits into those. the factory thread in the case doesnt have the pipe thread taper. if you run a pipe threaded fitting into it you can or most likely will crack the case. 78 malibu classic factory 4 speed. 87 grand national. Cooler feed out i just had my th350 rebuilt and was told the feed goes to the top of the radiator and the return goes to the bottom. the reasoning was the radiator is cooler at the bottom. i made new lines and installed a cooler when i installed the tranny. On the transmission (th400) the bottom line is out and the top line is the return. on the radiator the top is in and the bottom out. in other words the bottom transmission line runs to the top of the radiator. the top transmission line runs to the bottom of the radiator. Th400 cooler lines. cool, thanks for the info. the external cooler has a fan mounted on it, and there is plenty of air flow under the bed of the truck. the problem now is, i was just told that the radiator is not repairable, so now i gotta find someone who can custom build another one for me. :thumbup: reply like.
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