Tandem rear axle in 50 Chevy pu

Not really ,just the start of the 10 bolt Chevy truck axle swap into my 50 Chevy pu. It's done now.

 

What did the donor rear come out of and what is your new gear ratio?
How much wider is the new axle?
I'm sure you'll be enjoying a higher (and lower rpm) top speed now!

 

The 6 lug rear axle is from a 73-87 1/2 ton 4x4 or Blazer.There might be slight differences depending on the year.Earlier 12 bolt truck rears will also work with the usual mods.This axle is supposed to be a 1980, exactly 2 inches wider than stock.One inch on each side is not noticed.Even the donar axle parking brake cables can be reworked to fit.Obiviously this swap requires a conversion to open drive line.This truck has a SM420 truck four speed,I was able to find a late 50's SM420 rear bearing retainer and yoke for open drive from a guy on this site.I did this swap before on a similar truck.There other axles out there but I wanted a 6 lug.
The ratio is 3.42, common gears are 3.08-4.11.The 8.5 rear came with a nearly new Auburn Posi and 3.73 gears.I swapped in a set of 3.42 gears from a 2005 Chevy truck.With 30 inch tires 60mph be about 2300 rpm,about all a 235 can pull and not be too doggy.