Originally Posted by glw165
your correct i went outside got numbers off tag, then found a chart online the s919f is a 9.75 355 gear, so at least same ratio as front thank god, lol, so im assuming it came with 8,8 now 9.75 which is y bigger studs
The bigger studs were used in the 99 and up model years. They replaced the 12 mm studs with 14 mm. Some 99's have 12mm and some have 14mm also. It all depended on the production date.
You are better off with the heavier axle. You should also have rear disc brakes with the 9.75 axle. That may be why the change of rear axles. At least you have matching 3:55's so nothing there to worry about.