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Old 04-11-2019, 02:10 PM
Richard66 Richard66 is offline
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From the Transmission Repair Guy:

The ideal fluid temperature is under 175 degrees, but as fluid ages it starts to break down and lose its capacity to cool down the transmission. This is when transmission overheating occurs. At 220 degrees, varnish forms. At 240 degrees, seals start to harden. At 260 degrees, you’ll often experience transmission slipping as plates slip. At 295 degrees, seals and clutches start to burn and fluid forms carbon, at which point transmission failure might happen soon. But with every 20 degree drop in fluid temperature, your transmission’s lifespan can approximately double! That’s a pretty significant difference, a decrease from 220 degrees to 195 degrees can allow your transmission to last another 50,000 miles!
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Old 04-13-2019, 02:56 AM
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Thank you, sir!!!
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Old 07-11-2019, 04:39 PM
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My 2016 Ram 2500 diesel was driven for about 2 hours with the cooling fan running the entire time. Transmission temp was between 250-260. Dealer said the clutch for the fan was bad and replaced. 2 days later on a 3 hour trip cooling fan engages transmission temp reads between 250-260 for over an 1.5 hours. Dealer determines that the Transmission bypass valve thermal cooler is bad. Found DT code P0218. No transmission fluid flow. Dealer replaced bypass valve. Question i have is could more damage accured and should the transmission fluid been replaced.
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Old 07-11-2019, 05:43 PM
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That's pretty high, I'd drain a little and see if its black or burnt
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Old 07-11-2019, 06:31 PM
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You can get a suction gun, they look like a grease gun
You get a hose that fits tightly onto the suction gun, the hose should be about 4 foot long

Shove the hose down into the transmission fill tube & pull the plunger back all of the way & pull the hose out & squirt the fluid out into a clean container, like a jar

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