Re: Rear End Purchase!
I bought and installed the Strange Engineering "S-60" Dana 60 rear set-up for GM A-body cars in my Chevelle. But that's for an 800 HP car. So I wanted to have the 9.75" diameter ring gear and beefier pinion that the Dana 60 uses. But you wouldn't need a Dana 60 unless you're shooting for 700+ HP under the hood. Two cool things about the Strange S-60 rear is that it comes standard package with 35 spline axles, and it also comes with the carrier spanner nuts just like 9" rears have to adjust the back lash, and to install and remove the carrier without any wrestling match nor case spreader tool to wedge shim packs in there. Simply use a spanner wrench on the spanner nuts.
The 12 bolt Moser rears look nice, but it would be nice for easier ring and pinion gear swaps if you had a 9" rear since they have the third member which allows you to remove it from the pumpkin and set it on your workbench to perform the gear swap. It's all about pros and cons and trade-offs, and it depends what you plan to do with this car as far as power level goes. I'm guessing with those wheels and tires you have, you won't be taking it to the drag strip very often, if at all.
Keep in mind that with Dana 60 rears, and most , if not all 9" rears, they employ a 1350 series pinion yoke, which will require you to purchase a 1350 series transmission slip yoke, and 1350 U-joints along with a driveshaft with the 1350 yokes. As far as I know, even the aftermarket 12 bolt rears give you a choice to remain with the stock 1310 U-joints, or upgrade to the bigger 1350
70 Chevelle SS clone (632 CI powered).