When you pull the carrier, it's vital to keep the shims separated so you know which side they were on originally. Sometimes, depending on which type of axle you have, you can reuse the original shim packs, and sometimes not. No matter what, mark the original shims so you know the dimensions. In this case, we replaced the original one-piece shims with Randy's Ring & Pinion Super Shims. The kit comes with two hardened faces between which you stack smaller shims to make up the exact total thickness you need. That eliminates the need for lots of shims in stock.When you pull the carrier, it's vital to keep the shims separated so you know which side t With wide differences in tire grip, side to side, and a heavy load, the LSD may be overcome and the low-traction tire will still spin. You can augment the braking power of the LSD clutches by applying the parking brake (if it operates on the rear wheels), or by brake pedal modulation (a gentle on/off of the brake pedal). The parking-brake trick is preferable because it does not increase rolling resistance by also braking the front tires. If a bias ratio of 3.5:1 isn't enough (especially in a light rig), consider a locker. In most cases, an automatic locker is much more livable on the street than a very high bias-ratio LSD. With any given bias ratio, a light vehicle will be more affected in the drivability department than a heavy one-and vice versa. On the other hand, the higher bias on the light vehicle will deliver better traction in the dirt than it will on the heavy one. Low-bias LSDs are best for front axle use so as not to impede steering in tight quarters. The LSD is a good choice for terrain where the difference in traction side to side is typically not huge-mud, snow, sand, etc. Very uneven rock with tire lifting is the worst venue for it (though it can be augmented via the techniques listed above). To improve lifted tire performance significantly requires a high-bias unit or a locker. A tight fit is good. The carrier should come out hard and go in the same way. This is an indicator of correct carrier bearing preload. Interference fit will make you have to use prybars to get the carrier out and a soft-faced, dead-blow hammer to drive it in, complete with shims, making sure you keep it square all the way until seated in the bearing saddles. There are special shim drivers available, but otherwise take great care driving the shims themselves, especially the OE ones. They are very brittle and will shatter.A tight fit is good. The carrier should come out hard and go in the same way. This is an i Once the carrier is installed, recheck the backlash. Ideally, it should be within a thousandth or two of the original reading-at least within the spec for the axle. If backlash is out of spec, it usually means you may have mixed up the shims. A good reading indicates the gear pattern will remain where it was set previously (right or wrong). After the install, you should not have any new noise.Once the carrier is installed, recheck the backlash. Ideally, it should be within a thousa Don't forget to add the supplied friction modifier, which is used to reduce chattering. The recommended treatment is three ounces per quart of lubricant. The recommended additive is the commonly available type for use with GM or Ford axles. Do not add any more than needed, as it can decrease the oil's resistance to heat and oxidation and shorten its working life. As for the lubricant, Auburn recommends only a mineral-based SAE 80W90 gear oil, or SAE 85W140 if specified. Synthetics are not harmful to the unit, but can reduce the bias ratio due to their increased lubricity.Don't forget to add the supplied friction modifier, which is used to reduce chattering. Th SOURCES AUBURN GEAR, INC. 400 East Auburn Drive Auburn IN 46706 260-925-32__ www.auburngear.com Randy's Ring & Pinion (Yukon Gear) 10411 Airport Road SE Everett WA 98204 866-631-0196 www.ringpinion.com « | 1 | 2 | 3 | View Full Article By Jim Allen Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!