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Greg Reimer 7376 · 08-16-2009, 08:57 AM

Once you put a spool,good axles, wheel studs, the proper bearing kit and steel web caps in the 8.5" 10 bolt,(which you do to any race car rear end,anyway),it probably has 90-95% the strength of a 12 bolt. I don't think the weight is more than 5 pounds difference, but cost and availability is a real factor here. I wouldn't pull out a 12 bolt in any of my cars for a 10 bolt because they are there already,but if I had the 8.5" 10 bolt, I would go no further in my search. One advantage to the 12 bolt is the availability of gear ratios is larger.

08-16-2009, 08:57 AM	#5
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,136 Likes: 172 Liked 705 Times in 219 Posts	Re: Rear differential efficiency Once you put a spool,good axles, wheel studs, the proper bearing kit and steel web caps in the 8.5" 10 bolt,(which you do to any race car rear end,anyway),it probably has 90-95% the strength of a 12 bolt. I don't think the weight is more than 5 pounds difference, but cost and availability is a real factor here. I wouldn't pull out a 12 bolt in any of my cars for a 10 bolt because they are there already,but if I had the 8.5" 10 bolt, I would go no further in my search. One advantage to the 12 bolt is the availability of gear ratios is larger.