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Specs - 96 7.3, E4od, 2wd, 4.10 gear, 133k miles
I have been experiencing a shudder when shifting into overdrive. Shudder feels more like a lugging engine and it shakes the entire cab. The tranny fluid is red and not burnt at all. No play in ujoints. I drive around town with OD off because it shudders at 40mph-55mph only. Truck has sat for 1.5 years before I started driving it, idles fine and drives fine until overdrive.
 

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super96
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Not sure if this helps, but every E4od trans i have gave me issues with the neutral safety switch. The issues manifested in different ways from shudders, to slippage. Not an expensive part, might be worth checking out.
 

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Had a similar issue on my dad's 98 f150 (E4OD) for a few years. Ford had updated the recommended fluid to Mercon 5. We drained the converter and then would drive it a few days and repeat (since there isn't a drain plug). Took care of our shudder issue.
 
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Ford has never recommended Dexron - that's a GM fluid.
 
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