[Fitz]

No different than installing an Eaton Posi. Took 10 min. to get the unit in and 2 hours to get it correctly shimmed for pattern and backlash. Don't try it unless you have a dial indicator to measure the backlash and when you put it together tighten the nut on the pinion just finger tight or you'll be making a trip to the parts store for a new crush sleeve each time you have to change a shim. If the backlash isn't right you'll be breaking gear teeth. When correct the backlash should be somewhere between 0.003 and 0.007 inches and the pinion gear teeth should leave neat little half moons in the CENTER of the ring gear teeth as shown in the photo. Then you can tighten the nut on the crush sleeve on the pinion. Get the pattern marks too near the outside of the ring gear and same result as poor backlash...broken teeth the first time you back off the throttle then get back on it!