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Old 11-29-2003, 06:05 PM   #1
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Tranny filter

Hello, I am installing a tranny temp gauge on my
vehicle (325 1985). The tranny filter is mounted in the passenger side front wheel well.
Does any one know if the filter is in the line
going to the cooling radiator or is it in the re-
turn line after going through the cooler.

Any help will be appreciated. I know we can disconnect the lines and find out for sure. But
hope someone all ready knows.

Thanks
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Old 11-29-2003, 06:21 PM   #2
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1978 31' Sovereign
Texas Airstream Harbor , Zavalla, in the Deep East Texas Piney Woods on Lake Sam Rayburn
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Upstream or down?

The exchanger/filter SHOULD have been installed downstream of the radiator heat exchanger, but, if I were you, I'd check and be sure.

On mine, the tranny heat exchanger is mounted in the "hot" head of the radiator, so the coolest the tranny fluid will come out under normal operation is the thermostat setting. About 200 degrees in my case.

The best place to mount the temp probe, in my opinion, would be in the tranny sump.

Next most preferable position would be the tranny cooler line, right where it exits the tranny body.
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Old 11-29-2003, 08:58 PM   #3
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1959 22' Caravanner
Atlanta , Georgia
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I agree with Dennis.

GM typically goes to radiator then AUX cooler. Liquid to Liquid is MANY times more effective then Liquid to Air. The radiator cooler is still going to do the majority of the work. The AUX is just helping.

I also put my temp senders in the Sump or Pan. I want to see the temp after it has run through the workings of the transmission.

I personnaly like to see 180 or so. You do want some heat to cause any moisture that may get in the Transmission fluid to become vapor and purge. Any tranny guy worth a darn will tell you 200degrees is the point to start to worry. As long as it stays 200 orl lower the fluid should not burn and it's not hot enough to start hardening the seals. At a operating temp of 200max the transmission should go an easy 100k. At 300degrees the transmission is rated in hours.
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