So, after losing a wheel this last Friday, I have been trying to find parts to repair the brake backing plate. In pulling the axle, I looked at the gears to determine the ratio, as my son stated he can't use 5th gear in the NV4500 on the highway. Just falls on it's face. So I see that we have a 2.73 ratio in his K10 which seems really high, and I'm not even sure it came from the factory with that in reading around in some threads here. So I am trying to see what we really need as far as ratio to make this truck all around balanced. It is a 1984 K10, 6inch lift with 35inch tires. The trans is as stated, a NV4500 Chevy version, and the engine is a LS 5.3. Also, if anyone knows the backing plate part number for this truck, please let me know. Not seeing anything listed anywhere on the web.