If you have the the overdrive swich kick down button on the gearshift it is an E4od. Change the fluid about every 50 K miles & put on an external transmission cooler to help cool the fluid if towing or carrying a load. I have a mint 92 F150 XLT ext cab with E40d, but two wheel drive. Got it 3 years ago in the middle of a snow storm in Nebraska at $4,000 under book. Was planning on moving back down south so I would not have to work on ice in the middle of winter . So I understand about the cold fanny.