07-01-2024, 01:30 PM | #2 |
Senior Member
Join Date: Mar 2016
Location: Longview, TX
Posts: 758
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Re: 75 suburban help
They're a heavy chain driven transfer case. Full time four wheel drive with a center diff lock. I drive a '78 K5 that we bought new with the NP203. They're a really strong transfer case. I've done lots of really stupid things with this truck and we've never had a problem. They're always compared to the part time gear driven NP205 of the same era, which isn't exactly apples to apples. People will tell you to install a part time kit. Don't do it. You don't gain much on fuel economy and oil no longer is distributed correctly inside. Also, use a non-detergent oil for the inside. We pro-actively rebuilt it about 10 years ago, but it didn't really need it. I've always liked having full time four wheel drive. It always feels sure footed when things go south.
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