Tue May 14 2013 18:25:40 GMT+0000 (Coordinated Universal Time)
$2260 - Advance Adapters Atlas 2 Speed Transfer cases are the industry standard with well over 10,000 units sold and are the perfect choice for rock crawling, desert racing, or mud bogging. They are rated to handle the most severe off-road abuse in their standard form, however, competition-grade components are available for those that are known to push the limits. All Atlas transfer cases are custom built to order by Advance Adapters in the exact configuration that you need with the specific internal component and accessories that you choose.
Tue May 14 2013 18:35:12 GMT+0000 (Coordinated Universal Time)
Out of curiosity, what's the primary difference between a stock and performance transfer case?
Wed May 15 2013 19:54:57 GMT+0000 (Coordinated Universal Time)
Can't speak as to why you'd want to do it on all trucks, but some (GMs) are known for faulty transfer cases that can fail on drivers, expecially in extreme driving conditions. Prevent the ever increasing problem of pump rub.
What is "pump rub"
The GM transfer cases use a gear pump inside the case that is driven off the mainshaft. The pump forces oil to the planetary as well as the drive sprocket sleeve. Because the pump is driven by the shaft, the housing of the pump must 'float' in the rear housing. There are 5 tabs around the housing that fit into spots in the rear housing to position the pump. Over time, the pump can start to wear on the rear housing. GM installed a spring steel clip in the housing intended to prevent wear but the clip can break and render useless
Being that the pump housing is aluminum and is a harder material then the magnesium rear housing, it can wear a hole in the rear housing and cause a very small leak. This leak is high enough in the case that it typically will not leak when vehicle is not moving and therefor not leaving any drops on the ground. Typically the condition is not found until there is transfer case damage from running the case out of fluid.