12 bolt gear set treatment options

Dragsinger · 01-09-2015, 09:22 AM

Racers,

with my Super 10 buildup it uses a 6.0 ratio 12 bolt. The truck will run low 10's at about 3100 pounds.

It has a 327/300/293 with powerglide and I will leave with trans brake.

My experience with a 12 bolt in other race cars is good, all giving excellent service life. However, never anything lower than a 5.13 ratio.

The pinion for a 6.0 ratio is mighty small, each time it look at it I shake my head.

Let me hear about your experience with gear treatment options

Ed Wright · 01-09-2015, 11:15 AM

Why not use a 9" Ford?

Dragsinger · 01-09-2015, 11:40 AM

Ed, the 12 bolt housing is narrowed, braced, all brackets installed, Strange axles in house, spool and all hardware in house, under the Super 10 and ready for gear set.

At this time it is reasonable to move forward with the 12 bolt. I am willing to test the life span of the 12 bolt.

You can see photos of all the above in my Super 10 buildup.

Mark Yacavone · 01-09-2015, 03:31 PM

I don't get out much anymore, I guess.
I've never heard of a 6.00 12 bolt.
I thought it was 5.86, then 6.14.
Who makes the 6.00 ?

Dragsinger · 01-09-2015, 03:48 PM

Mark,

US Gear sold by Strange.

Mike Pearson · 01-09-2015, 04:03 PM

Larry,

I have a friend that races a GTCA Camaro with a 12 bolt. I think he has a 5.87 ratio. He gets between 100 and 150 runs on a ring and pinion. I would expect you will get similar gear life from your combo. I have a Dana 60 in my car with 5.86/6.17 ratio and I get several thousand runs on the ring and pinion in my car. The 12 bolt is not real strong but will be fast. I think its LPW that makes a girdle cover with a strut rod that runs to the end of each axle tube. This would be a good choice for your Truck. Also some billet caps.

Myron Piatek · 01-09-2015, 04:57 PM

I haven't sat down and counted the runs, but my Chrysler 8 3/4 gears have been lasting longer with cryo and REM surface finish treatments. I've had them done at Evans Performance near Atlanta.

http://www.evansperformance.com/

There was an article years ago showing that a 12 bolt was the most efficient differential. A Dana 60 is more efficient than an 8 3/4" which helps compensate for the weight and a Ford 9" is one of, if not the worst for efficiency.The pinion to ring gear relationship has a lot to do with the efficiency ratings.

Dragsinger · 01-09-2015, 05:21 PM

Mike,

LPW cover on hand. Strange replacement caps installed. Custom, in house housing bracing already completed. {all these items shown in my buildup post

}

Dragsinger · 01-09-2015, 05:23 PM

Myron,

Thank you, that is the info I needed. I appreciate the note.

Bimbo Jones · 01-09-2015, 05:41 PM

As to what Myron said, I two remember reading that article about horse power loss using the different rearends. And about that same time someone with an SS/BA Hemi Cuda was using an 12 bolt for that very reason without issues. BTW, I'm enjoying S10 build.

01-09-2015, 09:22 AM	#1
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	12 bolt gear set treatment options Racers, with my Super 10 buildup it uses a 6.0 ratio 12 bolt. The truck will run low 10's at about 3100 pounds. It has a 327/300/293 with powerglide and I will leave with trans brake. My experience with a 12 bolt in other race cars is good, all giving excellent service life. However, never anything lower than a 5.13 ratio. The pinion for a 6.0 ratio is mighty small, each time it look at it I shake my head. Let me hear about your experience with gear treatment options __________________ Larry Woodfin 471W

01-09-2015, 11:15 AM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: 12 bolt gear set treatment options Why not use a 9" Ford? __________________ Ed Wright 4156 SS/JA

01-09-2015, 11:40 AM	#3
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: 12 bolt gear set treatment options Ed, the 12 bolt housing is narrowed, braced, all brackets installed, Strange axles in house, spool and all hardware in house, under the Super 10 and ready for gear set. At this time it is reasonable to move forward with the 12 bolt. I am willing to test the life span of the 12 bolt. You can see photos of all the above in my Super 10 buildup. __________________ Larry Woodfin 471W

01-09-2015, 03:31 PM	#4
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,789 Likes: 2,881 Liked 5,077 Times in 1,935 Posts	Re: 12 bolt gear set treatment options I don't get out much anymore, I guess. I've never heard of a 6.00 12 bolt. I thought it was 5.86, then 6.14. Who makes the 6.00 ? __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

01-09-2015, 03:48 PM	#5
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: 12 bolt gear set treatment options Mark, US Gear sold by Strange. __________________ Larry Woodfin 471W

01-09-2015, 04:03 PM	#6
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,435 Likes: 608 Liked 1,903 Times in 571 Posts	Re: 12 bolt gear set treatment options Larry, I have a friend that races a GTCA Camaro with a 12 bolt. I think he has a 5.87 ratio. He gets between 100 and 150 runs on a ring and pinion. I would expect you will get similar gear life from your combo. I have a Dana 60 in my car with 5.86/6.17 ratio and I get several thousand runs on the ring and pinion in my car. The 12 bolt is not real strong but will be fast. I think its LPW that makes a girdle cover with a strut rod that runs to the end of each axle tube. This would be a good choice for your Truck. Also some billet caps. __________________ Mike Pearson 2485 SS

01-09-2015, 04:57 PM	#7
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	Re: 12 bolt gear set treatment options I haven't sat down and counted the runs, but my Chrysler 8 3/4 gears have been lasting longer with cryo and REM surface finish treatments. I've had them done at Evans Performance near Atlanta. http://www.evansperformance.com/ There was an article years ago showing that a 12 bolt was the most efficient differential. A Dana 60 is more efficient than an 8 3/4" which helps compensate for the weight and a Ford 9" is one of, if not the worst for efficiency.The pinion to ring gear relationship has a lot to do with the efficiency ratings. __________________ LOCOMOTION Racing

01-09-2015, 05:21 PM	#8
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: 12 bolt gear set treatment options Mike, LPW cover on hand. Strange replacement caps installed. Custom, in house housing bracing already completed. {all these items shown in my buildup post } __________________ Larry Woodfin 471W

01-09-2015, 05:23 PM	#9
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: 12 bolt gear set treatment options Myron, Thank you, that is the info I needed. I appreciate the note. __________________ Larry Woodfin 471W

01-09-2015, 05:41 PM	#10
Bimbo Jones Member Join Date: Nov 2008 Posts: 109 Likes: 0 Liked 0 Times in 0 Posts	Re: 12 bolt gear set treatment options As to what Myron said, I two remember reading that article about horse power loss using the different rearends. And about that same time someone with an SS/BA Hemi Cuda was using an 12 bolt for that very reason without issues. BTW, I'm enjoying S10 build.