Quote:
Originally Posted by Steve C.
I noted this information from B&M in the link from post #4:
"Monitor the transmission fluid as the fluid leaves the cooler and returns to the transmission. Monitoring the returning fluid will give you an accurate indication of how efficient your cooling system is functioning.
A good operating temperature of an automatic transmission is 160º to 200º F as the fluid exits the cooler."
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Not what I'd expect. I'm not in a position to challenge B&M, but I'd have expected 170--200 in the pan, not in the cooler return-tube. Many modern cars have transmission temperature sensors on the valve body
in the pan; the info is available to view using a scan tool, including cheap "dongles" that plug into the OBD2 connector.
It is entirely possible to over-cool the fluid with a too-huge transmission cooler.
Keep in mind that these vehicles had a maximum load rating--vehicle weight plus towing weight--and GM was prepared to warranty the transmissions with--in most cases--only the in-radiator trans cooler. Even if GM was playing the odds, and going cheap on transmission cooling, I see guys adding monster transmission coolers to daily-drivers and thinking they're doing some good when in fact the transmission fluid never gets to operating temperature.