NP203 Transfer Case
Once the beast was out, the input splines were checked for wear. The shaft coming out of the transmission should also be checked and replaced if worn. On the Ford divorced case with a yoke on the front, the splines can’t wear unless the yoke becomes loose. For manual-transmission Chevy and GMC applications, a coupler sleeve slides over the transmission output shaft and the transfer case input shaft, which are male style with external splines rather than the internally splined female style as shown on this Dodge. GM coupler sleeves commonly wear out and are a major source of drivetrain slop and noise. View Related Article
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