Hi All, Does anyone know where the ABS hydraulic unit is located in the 1991 E150 Econoline 2wd with an E4OD transmission. I have had a check light for a long time and just replaced the sensor in the rear differential, but the light is still on. The old sensor did not have hardly any metal on it. The brakes work fine with the light on. The real problem I am having is with 2-3 upshift, but now I have the pan down and found the filter lying in the pan. I am going to retorque all the bolts and add a filter clip, change the fluid which is not burnt.