12 bolt gears in a 9"?

Bill Edgeworth · 10-09-2013, 07:58 PM

My thoughts are its probably not allowed based on what went down with the Mopar guys where the old cars could not run the aluminum center section.

Jim Caughlin · 10-09-2013, 08:05 PM

No aluminum cases allowed in Stock regardless of what gears are attached so that kills it right there.

Greg Reimer 7376 · 10-09-2013, 08:55 PM

How about the guy who puts a third member together for a Drag Pack with this stuff? It's already aluminum, which eliminates it from consideration in an older car,but I always interpreted the "no crossbreeding of parts"rule to mean engine parts. Let's face it, in Stock Eliminator today, rear ends, transmissions and converters are way more exotic than ever. Also the 3 speeds in the earlier cars is a further refinement that is another departure from the OEM configuration. I bet the 12 bolt gear set would be good for something of an ET reduction in a Drag Pack.

kdanner · 10-09-2013, 11:12 PM

Quote:

Originally Posted by Greg Reimer 7376

How about the guy who puts a third member together for a Drag Pack with this stuff? It's already aluminum

Exactly. Same for the CJ, which is my intended usage.

kdanner · 10-10-2013, 10:20 PM

Quote:

Originally Posted by A56

Its really common in comp on the lighter or lower hp cars. Pinion gear height is more effecient. The problem is getting the gears, not many ratios available like the 9" so check that before you go any further. Get your gears REM finished and lightened and set them up properly without excessive bearing preload and youll be ahead of the game.

Mark Lelchook
D/ED F/SA

Yep, seen tons of them in comp cars myself and have read the opinions of some saying they are junk due to too much gear deflection which causes rapid wear and breakage. I figured in an automatic stocker since there is no big driveline shock they might just hold up fine.

I may just call Mark Williams and see if that offset pinion carrier is still available. I like it over the Strange deal for a few reasons:

1. It's very stealthy
2. Could be used with things like a through bolt carrier for more rigidity
3. If the 12 bolt gear deal doesn't work out, you still have a carrier you can just put a 9" gear into

10-09-2013, 07:58 PM	#1
Bill Edgeworth Member Join Date: Oct 2006 Location: Tacoma, WA Posts: 258 Likes: 0 Liked 0 Times in 0 Posts	Re: 12 bolt gears in a 9"? My thoughts are its probably not allowed based on what went down with the Mopar guys where the old cars could not run the aluminum center section. __________________ Bill Edgeworth 6471 STK

10-09-2013, 08:05 PM	#2
Jim Caughlin Senior Member Join Date: Mar 2002 Location: Woodburn, Or Posts: 685 Likes: 83 Liked 805 Times in 245 Posts	Re: 12 bolt gears in a 9"? No aluminum cases allowed in Stock regardless of what gears are attached so that kills it right there.

10-09-2013, 08:55 PM	#3
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,137 Likes: 172 Liked 719 Times in 220 Posts	Re: 12 bolt gears in a 9"? How about the guy who puts a third member together for a Drag Pack with this stuff? It's already aluminum, which eliminates it from consideration in an older car,but I always interpreted the "no crossbreeding of parts"rule to mean engine parts. Let's face it, in Stock Eliminator today, rear ends, transmissions and converters are way more exotic than ever. Also the 3 speeds in the earlier cars is a further refinement that is another departure from the OEM configuration. I bet the 12 bolt gear set would be good for something of an ET reduction in a Drag Pack.

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