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07-26-2020, 06:55 PM | #11 | |
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Re: 12 bolt vs Dana 60
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Mike Pearson 2485 SS |
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07-26-2020, 06:59 PM | #12 |
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Re: 12 bolt vs Dana 60
We have replaced most of our 8 3/4 mopar rears with Dana 60 AND lost no ET whatsoever on our Stock and SS stuff.
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John Irving 741 Stock 741 Super Stock |
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07-26-2020, 07:11 PM | #13 | |
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Re: 12 bolt vs Dana 60
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07-26-2020, 07:40 PM | #14 |
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Re: 12 bolt vs Dana 60
John, my main reason for exploring changing to 12-bolt would be the weight difference. Any performance would be gravy. Where I'm at now, I'm stuck with one class and have little to no flexibility to move up a class unless I want to run over 90lbs heavy. There's 116lbs difference to move up one class.
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07-26-2020, 08:47 PM | #15 |
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Re: 12 bolt vs Dana 60
It's been a few years since I switched from a braced 8 3/4" to a Dana 60, partially to gain some weight and was confident of no ET loss. I think it was only about 30-40lbs difference. Haven't run the car much, though.
Dana 60 is more efficient than an 8 3/4, but not more than a 12 bolt. (I recall an magazine article from the '70's or 80's. Not much, but it's there.) When bigger parts are cut down, like shaving weight from a ring & pinion, spools, etc. the differences in weight will be reduced. A 12 bolt will help in weight & efficiency over a Dana 60, but I have no idea about the actual weight comparison and it may sacrifice a bit too much durability. Seems like the ring & pinion is the weak link in an 8 3/4 as well as the 12 bolt. Lightened ring rear, drilled axles w/milled flanges, Kirkey seats, aftermarket brakes?
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LOCOMOTION Racing Last edited by Myron Piatek; 07-26-2020 at 08:52 PM. |
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07-26-2020, 08:54 PM | #16 |
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Re: 12 bolt vs Dana 60
its a couple of dollars, but an aluminum spool, gun drilled lightweight axles, and if you dare ceramic bearings i think the Dana will be just as fast as the 12 bolt and not have the gear trouble either, + 6.50 and a 7.17 option is nice as well. it will also last forever. you already have it in the car as well
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Todd Hoven 1035 Stock |
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07-26-2020, 08:59 PM | #17 |
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Re: 12 bolt vs Dana 60
If you're still wanting to try the 12 bolt, perhaps Charlie Boyles could offer some advice and what to expect with a 12 bolt.
http://www.competitionplus.com/drag-...a-legend-lives
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LOCOMOTION Racing |
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07-28-2020, 08:49 AM | #18 |
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Re: 12 bolt vs Dana 60
Hypoid angle for a Dana 60 is less than a 12 bolt. Several years ago, Car Craft did a side-by-side comparison of a 12-bolt, a Dana 60 and a 9-inch. The 9-inch was the loser. No clear winner between the 12-bolt and the Dana.
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07-28-2020, 08:48 PM | #19 |
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Re: 12 bolt vs Dana 60
I have run a 12 bolt in my Chevy II forever, steel spool reg axles 6.14 gear. 283 SS car with brake 6000 + . Used good gear oil and had very few problems putting hundreds of runs on the gears. Only if I was looking for saving weight would I switch. There is a difference in sprung and unsprung weight that may pick the car up. Unless you get the 12 bolt stuff cheep money might be better on other go fast parts. Way back in the day Rick Johnson ran a 12 bolt in his hemi car. Tom
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Tom Meyer 5240 SS Stock ??? Last edited by Tom Meyer; 07-28-2020 at 08:54 PM. |
07-28-2020, 09:25 PM | #20 |
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Re: 12 bolt vs Dana 60
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