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Both Autotrac and Smarttrak were originally designed and produced by New Venture Gear, but are now being produced by Borg Warner, since DC pulled the majority share of NVG and took it over... GM maintained the Muncie, Indiana plant where Borg Warner is making the transfer cases now. Both companies are producing under the same part numbers, NV 136 for the Olds and NV 246 for Autotrac. Both use electrically engaged wet pack clutch systems with multiple plates. The multiple plates allow both cases to manage torque split, something I didn't think that Autotrac could do. However, the 136 has more plates then the 246, thus giving it a bigger range of torque distribution and in his opinion better suited for on-road applications. the 246, on the other hand, has a lo-range (which produces up to 700 lbs more ft torque) and has a higher hardness rating, which make it more suited for off-road. I was able to find one site to support most of this info...http://www.4x4now.com/bd0599.htm
So, I guess it looks like tlauro and I were both right and wrong in some regards. I definitely give Autotrac more credit now.
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