Quote:
Originally Posted by K10-Kansas
Thanks for the great info in this old thread. I've got a 203 and am reading all of the threads diving into all the things I don't yet know about.
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Here is a good place to get parts and info on transfer cases.
I used an 90 degree (NPT) elbow to raise the oil level.
Link:
https://torqueking.com/category/1973...transfer-case/
The 1979 Oil Crisis had one good benefit in that it ended the use of the inefficient, gas guzzling NP203 transfer case by all vehicle manufacturers. To increase the fuel economy of their 4x4s, many owners of vehicles equipped with the NP203 installed "Part Time Conversion Kits" in the transfer case and locking hubs in the front axle. These conversion kits basically eliminated the inter-axle differential. With a Part Time Kit installed and the lockouts in free, fuel economy did go up, however lubrication problems related to the conversion destroyed many converted transfer cases. Since the NP203 does not have an oil pump, it relies on the rotating chain to splash oil on the upper shaft components. When operating a converted NP203 in 4x2 mode with the hubs in Free, the chain does not rotate which leads to oil starvation and failure of the upper shaft components (Raising the oil level in modified NP203 Transfer Cases helped, but did not solve the lubrication issue) Relatively few vehicles equipped with the NP203 remained in service beyond the mid 1980's.