Well, none of the spec books i have have a 17. It must be a late 90's thing. i only have through 93, Maybe someone else will chime in and help.

Do you have your owners manual? If so, you should be able to look in it about half way through and find the towing section. Its right before towing is the axle id chart. Maybe pg 164???

But truthfully, its not looking good. 12 is 2.72, and 18 is 3.08. im guessing that 17 is somewhere in between. And really anything higher(lower numerically) then 3.08 will be hard to pull with. But then again it could be 3.73, thats the only one that my books dont list, maybe they added it later and gave it 17.