[Ron61]

951Mat is correct about determining your gear ratio. Jack up the rear wheel, easier if you remove the wheel and tire, mark the disk or drum and also get one of the U-Joints where it is on top and the corner toward you and mark that corner. Then turn the wheel one full turn and count the times the drive line turns. Example, if it turns 3 1/2 times you have 350 gears or whatever your rear end uses in the 350/356 range.

Ron