Either figure out which rearend you are going to use and select a transmission to match, or figure out which transmission you will use and select a rear to match. By the way, I'm not sure by what you mean a "better gear ratio". The better gear ratio depends on how you are using your truck. If you want to pull some loads, lower gears will be better. If you want to cruise the highway, higher gears will be better. If you want to do both, the factory gears with an OD transmission will be the best. It really depends on how you want to use your truck.
On the HO33 rear axle housing... I believe that axle is plenty strong for a 235. I would not put one behind any engine that makes over 300 HP, as this cast housing will not withstand heavy torque forces. I wrecked a completely overhauled HO33 in my 59 gmc with a 300+ HP motor in less than 30 miles. The axle perches were ripped right off the axle tubes, causing the tubes to shatter. Expensive mistake, but now I have posi!
Sorry I should have clarified, I'm looking for something that will allow the engine to comfortably cruise at the 45-75 range. I plan on hauling various things in the bed of my truck, but nothing too big and I don't need gobs of low end.
