9" vs 12 bolt. - Page 2

Jim Caughlin · 04-19-2023, 05:48 PM

Quote:

Originally Posted by richie 2

is it popular today in SS? strange 12blt case/9'' housing...

lots of them

james schaechter · 04-20-2023, 07:09 AM

Quote:

Originally Posted by Dirk Olson

Better gear selection with the 9 bolt. and using a dewco center section with a 9.5 ring gear starts to level the playing field. Given the ease of gear change out, gear selection, it would hard to go to the 12 bolt unless class dictates it.

I changed from a 9 inch to 9.5 inch Gleason set up. These were pretty common pro stock set ups years ago before they moved on to bigger stuff. Much more efficient than the standard 9 inch

Race Clean · 04-21-2023, 01:42 PM

A buddy used one of those 12-bolt drop out pieces many moons ago in a SS application.
He used up gears like crazy, that lead me to believe the performance advantage aspect somewhat disappeared, it was a heavy car
and the Aluminum 3'd member maybe was flexing?

Ralph A Powell · 04-21-2023, 03:39 PM

A good test would be to a loss test on the 9” nodular vs the High strength steel that Strange manufactures for Ford NASCAR program the HS case is 3 lbs lighter that nodular and about 30 % stiffer. According to Bob Stange so it hold everything in place. I don’t believe an aluminum case is as strong as the Ford nodular with the modified tail bearing, the Daytona pinion support and a load bolt to support the ring gear.

04-21-2023, 01:42 PM	#13
Race Clean Member Join Date: Aug 2017 Posts: 159 Likes: 18 Liked 129 Times in 53 Posts	Re: 9" vs 12 bolt. A buddy used one of those 12-bolt drop out pieces many moons ago in a SS application. He used up gears like crazy, that lead me to believe the performance advantage aspect somewhat disappeared, it was a heavy car and the Aluminum 3'd member maybe was flexing? __________________ Stop global whining

04-21-2023, 03:39 PM	#14
Ralph A Powell Member Join Date: Oct 2017 Location: Bay City Texas Posts: 389 Likes: 2 Liked 225 Times in 136 Posts	Re: 9" vs 12 bolt. A good test would be to a loss test on the 9” nodular vs the High strength steel that Strange manufactures for Ford NASCAR program the HS case is 3 lbs lighter that nodular and about 30 % stiffer. According to Bob Stange so it hold everything in place. I don’t believe an aluminum case is as strong as the Ford nodular with the modified tail bearing, the Daytona pinion support and a load bolt to support the ring gear.