I can appreciate your alarm over this grinding noise. My mind seems to hover over the thought of the transmission. Some transmissions rely on the proper fluid level to create movement so if the level is low that could be a cause. Otherwise, it may require a more invasive inspection. I have located a link that's highly technical but will be very helpful in addressing this issue and pin pointing the cause.
to view the link. Though this link discusses a different model number,
the mechanics are likely going to be very similar.Keep in mind that an expert will be
responding within the next two business days if not sooner and will likely offer you more information and
instruction. If you feel you would need further assistance, or if you feel like you would be more comfortable
having an expert resolve your issue, I would strongly recommend Sears Home Service.com. When you do,
make sure to take advantage of their 10% off coupon available to you for making your Sears Service appointment on line.
to open to their page for home service. I hope this will help you and have a nice day.