this is my assumption, and a fluid change will likely confirm. so ive got lucas oil additive, likely making the ATF foamier than a root beer float, causing intense heat and burning the fluid, rendering it useless. a bent spindle or axle are a possibility, but those would likely be visible from the outside and present at all speeds.Īfter reading about a notorious "torque convertor shudder" that these transmissions apparently develop after the fluid gets burned, and after numerous people told me that it was causing my problem, i thought i would look into it further. but, as replacing the wheels and tires (with bigger ones) didn't change anything, that probably rules out bent wheels and out-of-true tires. So, a few months later, the truck develops a very severe shake between 38 and 45mph, one that i could compare to driving on tires shaped like cam lobes. At the same time, and under my own assumption that the fluid had likely never been changed, i added a quart of Lucas oil additive when i filled it up, so as to prevent any further damage (if only i'd seen the article about lucas and foam). about a year and a half ago, i changed my transmission fluid and filter (dropped the pan down, made a huge mess, replaced whatever fluid fell out of the pan, not realizing that a good bit of fluid stays behind in the lines, cooler, convertor, and cylinder). 6" suspension and 3" body lift and 38" tires with stock 3.50 axle ratio. Just a precursor: if any of my transmission logic is in error, please let me know before i spread the ill wisdom elsewhere.įirst, the background: the vehicle is a 93 f150 5.0, e4od transmission, bw1356 t-case, 8.8 rear and d44 front axle. I will give you guys the background and let you decide. After reading a rather compelling article on this website about oil additives (specifically, Lucas) and how they cause foaming, and essentially, more serious problems, i realized that it may have caused a pretty significant problem with my F150.
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