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Old 06-21-2003, 06:18 PM
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difference between 10 and 12 bolt?

I was just wondering if the only difference between a 10 and 12 bolt chevy was as simple as the number of bolts in the ring gear? is everything else the same dimentions? (bearing size, carrier size, ring gear thickness, things like that)

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Old 06-21-2003, 06:46 PM
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Virtually nothing is the same.
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Old 06-21-2003, 06:47 PM
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ahhhhhhh i see, well thank you very much for enlightening me.
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Old 06-22-2003, 08:12 AM
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Didn't mean to be so blunt but that's it in a nut shell AND the dozen or so different 10 bolts have very little in common with each other. On top of that in '69 & '70 Olds had a differential with a 12 bolt cover and a 10 bolt ring gear which has very little in common with any other GM rear.
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Old 06-22-2003, 09:00 AM
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12 bolts are much stronger than 10 bolts espically the 10 bolts with the 7.5" ring gear. 10 bolts had ring gears that were as large as 8.5" & they are pretty strong. If your not running 900 horsepower a 8.5" 10 bolt that is set up right is a fine rearend.

For all around durability a 12 bolt or even a little better a 9" ford is what you need.

Another thing GM actually made 3 different styles of rears 10 bolts, 12 bolts & 14 bolts. The 14 bolts were mainly in 1 ton's 3/4 tons & 454SS trucks.
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Old 06-22-2003, 09:15 AM
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Personally I do not think a 10 bolt should even be considered for a mildy modified small block. Case in point is my experience with my 70 Model Chevy Nova. I had a warmed up 307 running street tires with some traction bars. I was typically turning 13.50's 13.70's at the strip. Eventually the rear axle started rotating off the spring perches and the whole assembly had to be replaced. Luckily I found a used 12 bolt that fit the Nova and the problem went away. I never did break anything in the 10 bolt rear axle though.

Vince
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Old 06-23-2003, 09:30 AM
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One of the reasons that I made sure that I put the ring gear diameter for my 10 bolt is because GM actually made 3 different sizes for the ring gears. 10 bolts aren't made for racing, can you race them, yep, I know more than one person with a built 10 bolt with a spool & hardened axles that are very strong.

Buick Grand Nationals were running Low 11's & High 10's on 10 Bolts with 200R4 transmissions. That's 2 things that don't scream speed 10 bolt with a 200R4.

My 2002 Formula has a 7.5" ring gear 10 bolt, it's already run 11.42 & my friends 2000 Ram Air Trans AM has run a 10.90 on the stock rear end, he has a 12 bolt now, but he did make a 10 sec pass on a 7.5" 10 bolt. The thing about the 7.5" 10 bolts is that they will make a race, but will it blow up on the first run or on the 300th run? It's like playing russian roulette.
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Old 06-23-2003, 07:25 PM
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I dont see why GM uses the 7.5 inch rear with the trans ams and camaros. Theres some fast F-bodies out there, it seems logical to me to use the next step up in rears. Ford uses their 7.5 in nothing with more than a V6. Whats up with that???
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Old 06-23-2003, 08:43 PM
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It's because they want all these parts replaced with ford 9"s
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Old 06-25-2003, 05:55 PM
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Smaller rear ends means less weight. Thats why they are being used today. In the days of 12 bolts and 8.5 10 bolts and Ford 9 inch, no one cared about weight or gas milage!!

Trees
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Old 06-27-2003, 01:46 PM
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Quote:
Originally posted by trees
Smaller rear ends means less weight.
Trees
Smaller rear ends also mean less material, less production cost, shorter duty life, more repair parts sales, more profit.
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Old 06-29-2003, 10:55 AM
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Alright now im spooked,
I got a 12 bolt off a 69 Cutlass and it is now on my Pontiac. Someone mentioned a 10 bolt in "sheeps clothing"(12 bolt cover). How would i be able to tell?? Do you think GM would have put a 10 bolt gear set up on a Cutlass??
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Old 06-29-2003, 08:24 PM
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There are a couple of Olds sites that give a pretty good description of the oddball "11 Bolt" as I like to call them. Can't remember the URL's off the top of my head but I had done a Google search for GM 10 bolts and they came up.

A good friend bought a '69 4-4-2 convertible back in the day with a dead 400, 4 speed and a 3.90 "12 Bolt". He was going to drop the 400 Pontiac his brother had pulled out of his bracket car in it with a set of 4.56's. He pulled the back cover to slip in the 4.56's and the carrier was a 10 bolt ! As far as I know the '69 Olds Cutlass and 4-4-2 was the only A-body to ever get this abortion. It was a very strong rear, don't get me wrong, you just couldn't buy anything for it and this was in the late 70's. He ended up putting a Pontiac 8.25" 10 bolt in it, also out of his brother's bracket car. That nasty lookin' old lump ran mid 12's on leftover used parts. Amazing. He sold it and the next owner returned it to Olds power and cherried it out. Another good friend found it a few years ago and brought it back to the area. We all had a lot of good memories of that car. Good to know it has survived.
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Old 06-29-2003, 11:01 PM
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Pheww!!!!
Thanks for clearing that up Hippie.
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