The NP203 transfer case used in the 1976 Chevy Blazer has a gear ratio of 1:1. If you want to reduce your RPMs, you can replace the NP203 with a transfer case that has a lower gear ratio. Some possible replacements include:
* NP205: 1.96:1
* Atlas II: 1.94:1
* Dana 300: 2.62:1