Has anyone successfully used synthetic fluid in their 4r100 transmission (2000 model)? What kind did you use? Ford seems to be behind the times! glen at ccim dot net
Synthetic A/T in 4r100???????
May 13, 2006
Last reply: 20 years ago
2 Replies
First reply
I am not convinced that it is that much of a plus for a tranny. Sure it can take more heat than regular ATF fluid but the tranny seals cannot so that fact that it can means little. A tranny properly serviced with dino ATF and properly cooled will last a very long time.…
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I am not convinced that it is that much of a plus for a tranny. Sure it can take more heat than regular ATF fluid but the tranny seals cannot so that fact that it can means little. A tranny properly serviced with dino ATF and properly cooled will last a very long time.
----------------- The SnoMan
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ATF is specially formulaed so as not to foam causing a change in pressure..... I have never heard of synthetic ATF.Use what the manufacturer recommends and drop the pan rather than flush. Engineers spend a lot of time ensuring the ATF they recommend does its job in the transmission. If you have one of the early 4R100 98-99 they had a lot of warranty units around. Never did figure out what the problem was.
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