The first couple years of the V10 / 4R100 powered F53 didn’t have a cooler in the cooling system radiator, only an external transmission radiator. In addition to the vehicles radiator, chassis builders also add an external radiator type cooler to supplement cooling. Transmission fluid passes through this tube, hot transmission fluid is cooled when the heat gets transferred into the vehicles normal antifreeze coolant. Most cars and later model F53s have a transmission cooler that’s an integral part of the vehicles cooling system radiator, a tube that passes through the lower tank portion of the vehicles radiator.
WHAT I LEARNED ABOUT THE F53 TRANSMISSION COOLING SYSTEM AND, I discovered a couple things about my transmission cooling system that I’ll deal with next spring. I also replaced the transmissions vent hose that was plugged. I replaced the external in-line filter with a WIX 51622 spin on filter. When you buy your filter, make sure to get the one for the deep pan. the pickup tube doesn’t go all the way to the bottom of the deep pan. The short pan filter will work, but won’t be able to take advantage of the additional fluid depth in the deep pan. IMPORTANT – The FT1131A is for a shallow pan, we have the deep pan.
IN LINE TRANSMISSION FILTER FULL
The flush process took 5 gallons of Valvoline ATF Full Synthetic (Walmart $18 a gallon) and a Fram FT1131A internal filter.
IN LINE TRANSMISSION FILTER MANUAL
The owners manual calls for MERCON ATF fluid, I used Valvoline ATF Full Synthetic which is compatible with MERCON ATF. The magnet had some fuzz on it, Everything looked normal. When I drained the fluid, the color was a little brownish and there wasn’t any burn smell. To make sure the preventative maintenance was up to date, I decided to flush the transmission and replace the filters. On our 7500 mile trip last winter (2017/2018), I never experienced any transmission issues. I suspect the transmission fluid / filters have never been changed. Our 19 year old Southwind (F53 chassis) has 65k miles on it. I read about this problem somewhere so planned on replacing the in-line with a spin-on filter. I also noted the inline filter had a small leak out the end. This was part of a Ford TSB for early model 19 F53. When we bought our Southwind a couple years ago, I noted our transmission (4R100) had an aftermarket in-line filter installed in the cooling line. NOTE – Sorry for the lengthy post on such a simple filter change and transmission flush, but as I got into this project, I discovered other issues that needed attention.
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