JasonA Posted January 28, 2004 Report Share Posted January 28, 2004 Car in question: '97 SLS, 127k miles. 1) How is the differential itself lubricated? In conventional RWD vehicles, there is a differential case in which something like 80W-90 oil is used. Is that the case with the 4T80-E transmission also? Or are the differential gears lubricated by transmission fluid? 2) I'm sure it was an old wive's tale, but they used to say that if you haven't changed the transmission fluid often, if you change it way later in life you'll just do more harm than good. The fluid in mine is, I suspect, still original and when I take it in to have the strut mounts done, I'd like to have them change the filters and fluid. I assume that with only 127k miles, it'll be perfectly fine to have this done? 3) Anyone seen the new Sierra commercial where they show it climbing an incline with one wheel on concrete and the other on rollers, to showcase the standard posi-traction axle? Could our Cadillacs do that? I know the traction control has been explained before as mimicking a "posi-traction" or limited-slip device. Under those circumstances though, with that much weight and gravity against it, would it be able to pull the car up the hill? Just curious. Thanks, Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
This topic is now archived and is closed to further replies.