For years pretty much all Land Cruisers had the same size nuts holding the flange onto the pinion. Mine has a Nitro 4.88 gearset which has a 29 spline front pinion (even though it is a smaller dif). I'm pretty sure the rear nitro pinion is 27 spline but has an undersized pinion nut compared to the OEM gearset. Can anyone confirm this? Last time I replaced a rear seal I recall ordering a new "factory" sized nut and it was too large.