73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Timber on November 16, 2007, 07:03:49 pm
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My 79 2wd K5 has the small 10 bolt rear. I was talking to a friend tonight and found out another friend is parting out his 74 C10 2wd with the 12-bolt.
Will it bolt in my truck with no modifications?
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You will need a cross over u joint. The 12 bolts use a u joint with smaller caps, and a smaller cross.
The brakes are different diameter and width too. You will be fine if you use the 12 bolt brake parts.
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You aren't gaining anything doing the swap though.
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Why not?
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Because the ten and twelve bolts are really about the same as far as strength etc.
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We could debate this subject forever but I can tell you I've broken more 10's than 12's. But I wouldn't bother with the swap without a good reason either.
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I agree. I too have broken alot more ten bolts than twelve, but I have broke quite a few 12 bolts too.
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I agree it is a touchy subject, but I think we can all agree that
a) if you are running a stock truck the swap is wasting time/money
b) If you are wheeling on one really hard either have the potential to break. If you broke a 10 and have a 12 to replace it, no biggie. but I wouldn't buy one I would move to a 14bolt.
c) If you are running larger than 33's and are doing what is decribed in b), going to a 12bolt from a 10bolt isn't a big gain, just find a 14bolt.
If you are going for strength and starting with a 10bolt I would move to a 14bolt if I thought I would be putting it through something that would grenade the 10bolt.
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Keep in mind if you do that your lug patterns
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I was told today it will be mine for free or next to it. And it has factory posi, perfect for the 4.10's I'd planned on. The truck is a toy and I'm building it for no other reason than for cruise-ins and fun, and to make it beat cars that shouldn't get spanked by a 79 K5. The extra strength may be marginal but it's free. I'll take it. I appreciate the help.
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Keep in mind if you do that your lug patterns
Don't know how I missed that. 2wd 12-bolts aren't 5-lug 5x5? This is a 2wd truck, not a mudder.
Thanks.
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Keep in mind if you do that your lug patterns
Don't know how I missed that. 2wd 12-bolts aren't 5-lug 5x5? This is a 2wd truck, not a mudder.
Thanks.
Youre good, the 12 bolt is also 5on5...I think he meant the difference between the 10/12 bolt and the 14 bolt. What gears are in both rear ends? Are either of them posi? That would be a deciding factor for me.