I have 5.4 4x4 and the dealer says I should change the tranny fluid every 30k and the axle/differential and transfer case fluids every 60k. They did not say anything about tranny filters though. This tranny does not have a dip stick like all others I have had. Does anyone know how or where to check the tranny fluid level and condition ? Any suggestions if these intervals are excessive or if anyone has even changed the axle/differential and transfer case fluids ?
Here's what I have done on every vehicle (auto trans) that I have owned for 30 years....
At 20k miles, I change the filter (due to possible residual/initial wear particulates that may be floating inside) and either drain the torque converter (if so equipped with a plug) or disconnect the trans cooler line at the radiator, fill the pan with fresh fluid, my wife starts the engine and when 2-3 quarts drain into a bucket, she shuts it off, I refill the pan and repeat until the fluid is clear and in case of the f150, 14 quarts of fresh fluid is in.
I change only the fluid after that (unless I determine substances/contamination in the oil). The intervals vary depending on the type of trans, type of fluid and conditions, but in general, every 30k miles. Heat is a killer on automatic trans fluid and when we lived in the desert area, I changed the trans fluid at the end of summer every year.
In regards to filters, oem is fine, but I typically use Wix.
In regards to trans oil, both in sticks and autos I have always used Valvoline.
I have also never had a trans failure in any vehicle I own and typically keep my vehicles for 10+ years, with over 100k on the odometer.
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