This is the drive chain that drives the front output shaft on the NV-246 Auto t-case used in GM pick-ups and SUV'S from 1998 - present. If you are repairing your case and it has many miles on it, do not forget to replace this chain, you will be glad that you put this part in. Questions? Call us Mon. thru Fri. 8:00 to 5:00 EST TOLL FREE 1-877-614-4327.