I have an 01 f150 5.4 4x4. Sometimes it feels like the truck will start out in first gear and then shift early into 2nd and loose power. Other times it seems like it starts out in 2nd gear. The speed sensor on my rear differential was broken off could that be the problem.

 

Yes that could cause the problem.
Alan

 

I'd suspect you have other symptoms that you haven't mentioned.

The rear diff sensor isn't used for speed sensing to control shifting on your truck, it's only used for the 4WABS system. Given all the threads about failed rear diff sensors, no one ever mentioned a shifting problem like you have in conjunction with the failure of the sensor.

Have any more symptoms or fault indications?

Steve

 

Nope none other that Ive noticied. My rear differential did blow up, one of the gears shot through the casing.. I posted some pictures and a thread about it awihle ago