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10 bolt question

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Old Jan 18, 2012 | 04:48 AM
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Default 10 bolt question

I hear people all the time say (type) how crappy out 10 bolt rear end is....

I don't ever drag race and I don't plan on it. My car is a daily driver and I'm probably at about 350 to the wheels right now. I don't ever really punch it off the line hard and when I do... it's very rare. I'm more of a... drive up a windy mountain road fast kinda driver. Maybe some day some kind of race track or autocross type of race, but never drag racing. I plan on putting in a cam in the next couple of years. I want to make 400 RWHP.

My question is... do people usually break their rear end in the beginning of a drag race or just driving around? Basically... if I make 400 RWHP... do I need to look for a new rear end no matter what... or only if I plan on drag racing? Thanks
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Old Jan 18, 2012 | 06:51 AM
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most often people break them from launching the car, though there is no gaurantee that it won't break just driving around.

if it was me i would get a girdle and use the 10 bolt and if you start having issues with it then look to upgrade
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Old Jan 18, 2012 | 09:30 AM
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If your an auto your gonna be fine...other than that I personally wouldn't worry too much about it. When/if it breaks, fix it. Unless you highly modded, and drag/street alot, then go ahead and upgrade. Expensive buy if theirs nothing wrong with it.
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Old Jan 18, 2012 | 09:41 AM
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agree if your an auto your fine, m6 cars have the issues, hard launches on a m6 car your asking for it lol, honest if your not doing alot of dig runs on drs you will be fine,
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Old Jan 18, 2012 | 01:32 PM
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I have an M6 and I just have regular 275 tires. And I was looking into the girdle since I have to change out my fluid soon anyways. It seems like it could help at least a little.

What is the part that usually breaks first? Is there some kind of weakest link? I know that once you fix the weakest link... then there will be another weakest link... but I'm just curious as to what breaks first...
Thanks again
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Old Jan 18, 2012 | 01:57 PM
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Axle shafts are weak and the ring and pinion is too small as well and is prone to failure.
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Old Jan 18, 2012 | 02:21 PM
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Originally Posted by chewybacca11
I have an M6 and I just have regular 275 tires. And I was looking into the girdle since I have to change out my fluid soon anyways. It seems like it could help at least a little.

What is the part that usually breaks first? Is there some kind of weakest link? I know that once you fix the weakest link... then there will be another weakest link... but I'm just curious as to what breaks first...
Thanks again
The whole thing is a weak link, the posi unit blowing up is quite common, along with breaking teeth on the pinion/ring gear. The axles break too but it doesn't seem to be quite as common. There are things you can do to beef it up but I wouldn't waste your money, you can polish a turd all day long and at the end of the day you still have a turd. My biggest mistake on my car was rebuilding that pos, a couple 2-3k launches on 295/35R18 KDW2s and it was screaming for its life again at 50+mph less than two weeks the damn thing was quiet. If you had an auto I would leave it alone, they seem to last but the damn six speeds just wreak havoc on that poor small bastard. I guess if your not gonna drag it all then you should be alright too. Whatever you do don't put the 4.10s in it, the pinion looks like it belongs to a matchbox car.
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Old Jan 18, 2012 | 02:27 PM
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A good rebuild, with a pinon spacer, a girdle, and a good ring and pinon I think you will be fine. Thats what I am going back to. If I break it then we shall see. The Motive Performance gears are supose to be strong, thats what I am going with. You will blow the tires off before you break the rear. My buddies 383 LT1 is putting out 500 at the crank and his little 10 bolt is taking it all day long on the street. It has a slight decel whine that was there after I set it up and after break in we beat the **** out of it. The thing is still virtually silent. Stay away from 4.10 and numerically higher gears 4.56..etc (if launching the car) the pinion gets too small. I read about guys breaking 4.10's more than anything.
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Old Jan 18, 2012 | 02:39 PM
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Originally Posted by 96lt4c4
A good rebuild, with a pinon spacer, a girdle, and a good ring and pinon I think you will be fine. Thats what I am going back to. If I break it then we shall see. The Motive Performance gears are supose to be strong, thats what I am going with. You will blow the tires off before you break the rear. My buddies 383 LT1 is putting out 500 at the crank and his little 10 bolt is taking it all day long on the street. It has a slight decel whine that was there after I set it up and after break in we beat the **** out of it. The thing is still virtually silent. Stay away from 4.10 and numerically higher gears 4.56..etc (if launching the car) the pinion gets too small. I read about guys breaking 4.10's more than anything.
I dunno, I had a solid pinion spacer, a support girdle and OEM GM gears. It was great nice and quiet for a couple of weeks. A few weak sauce 2-3k launches and it was howling like crazy again. Granted my street tires are sticky and wide but still this was on the stock slipping clutch and stock torque arm. Needless to say thats why I have an S60 sitting under it now.
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Old Jan 18, 2012 | 03:41 PM
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Haha it still sounds like you guys beat on it more than I do. I'm not planning on gears at all. It's too expensive to polish a turd like you said. I think the most I'll do is a girdle for right now. Because like I said... I almost never launch it.
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