collinjx Posted July 2, 2021 Share Posted July 2, 2021 Every 30,000 miles I drain and refill my transmission. The transmission and replacement oil is at ambient temperature. I refill the transmission with the same volume I drain. When a dealer does a drain/refill three times for a transmission flush, between the each drain/refill the vehicle is driven to bring the fluid up to operating temp and mix the new fluid with the old. I'm guessing the service tech checks the transmission fluid lever after each drain/fill when the fluid is up to temperature. My question is if the fluid has to be up to temp to check the level, is this because the fluid expands at higher temps and contracts at ambient temps. If the fluid volume changes with temp, is the transmission fluid level low before it's up to operating temp? Quote Link to comment Share on other sites More sharing options...
G B L Posted July 3, 2021 Share Posted July 3, 2021 I would be surprised if the vehicle was driven during the flush. The reason for the flush is to get most of the fluid in the converter exchanged. When the last 3 quarts of fluid is added let the TC run for 15 min that will bring the fluid up to check the level. Quote Link to comment Share on other sites More sharing options...
Double Nickels Posted July 4, 2021 Share Posted July 4, 2021 On 7/2/2021 at 5:18 PM, G B L said: I would be surprised if the vehicle was driven during the flush I don't think they drain and fill. Most shops have a machine which connects to the transmission lines. It saves money on fluid and time. Quote Link to comment Share on other sites More sharing options...
G B L Posted July 4, 2021 Share Posted July 4, 2021 7 hours ago, Double Nickels said: Most shops have a machine which connects to the transmission lines That is probably correct for most. The only issue is how hard the cooler lines are to disconnect. I pull the lines most of the time. The lines on my TC were enough of a pain that the drain and fill was easier for me , having a lift and a step ladder! Quote Link to comment Share on other sites More sharing options...
Fifty150 Posted July 6, 2021 Share Posted July 6, 2021 Most dealerships would also have the special proprietary tools to remove Ford transmission lines. With the quick release tool, those fittings come off in seconds. I suspect that some techs, once the van is on a lift, would remove the driver side front tire and the wheel well. That would give access to the transmission lines. Quote Link to comment Share on other sites More sharing options...
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