original balzer
1/2 ton status
Depends on what the plans for the truck are. If you like doing a lot of freeway driving then either 4.88 or 5.13 will be a little stout (i.e. high rpm) with a non-overdrive transmission.
My recommendation would be to put the truck together with the existing 4.10 gears and see how you like it.
Thats hard for me to do. I had all this drivetrain in my blazer and ran 38's for a while. BUT the engineS were well worn 305's about 55mph was all I could do. I know the engine in my 77 has a LOT more power than those crappy 305s but it just sucked in high range.
Now someones gunna ask how many 305s I went through.
The answer is 4 First one just flat out ran out of power and ended up with about 25lbs of compression. Second one got submarined. 3rd one let loose on a 8000 rpm low range 1st gear snowy icey and steep hill climb (but I made it to the top) and the 4th one the best runner of the 4 kept back fireing so I was going to replace the timming chain. ended up the cam was broke right in 2 at #7 exhaust lobe. I dont like running free engines anymore HAHA. I used to be almost as hard on parts as Shawn

