Not to side track this topic, but I familiar with the Jeep cases. I installed a NP229 in my Eagle to gain low range. It has a viscous coupling so it is a full time case. I like to know if I am driving in bad conditions I can put it in 4wd and not worry about damaging the TC when hitting a dry patch of pavement. The reason I asked is because I keep toying with the idea of installing a Chevy 5.3l in my Eagle and instead of going through the trouble and expense of and adapter for Jeep transfer case, I was wondering if there was a Chevy equivalent. I guess not. Thanks for the info. ^