A common question is “What is the best thing to have in the rear end?”. In most cases it is hard to beat a spool. A spool is the lightest, least expensive and consistent. The disadvantage of a spool is that it requires the correct stagger and someone capable of keeping it within 1/4". If your tire selection or ability prevents this, then you need a differential. There are dozens on the market and a new one each year. None will entirely eliminate the influence of stagger. With the exception of a Detroit Locker, they are simply a series of gears that lock together between torque and resistance. The detroit locker is the most dependable and consistent of the differentials when set up properly.

The 5.7lb. Standard spool and the 5.1lb. Ultralight spool are both 31 spline. The only difference is the weight and the price.

Use this plug or a longer axle, to lock up differentials.

The standard locker weighs 14.1 lbs. while the light locker weighs 10.6 lbs. The most consistent and affordable of differentials. Springs should be changed once per season (2 required).