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#1
02-06-2005, 09:17 AM
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Ive seen several of my buddies grenade 7.5's. I had an 87 Monte Carlo with factory 3.73's (7.5). I ran several 10 sec passes, and quite a few 11's, and its still going. But ive also seen them break on 13 sec passes.. I guess its the luck of the draw.... But if i could afford it, i'd buy a 12 bolt or something...
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#2
02-05-2005, 12:05 AM
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I have destroyed several 7.5 rears with MILD small blocks. Had one blow with a really mild 305........those rears are crap in my opinion.
I would find an 8.5 thats slose to the right width and weld the brackets from the stock rear to it. I wouldnt even waste time using a 7.5 for anything but a V-6 or MAYBE a stock small block. Even modified 7.5's with aftermarket axles, etc. probably isnt gonna last long behind your 400.
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"It is foolish and wrong to mourn the men who died. Rather we should thank God that such men lived."- General George Patton "Perpetual peace is a futile dream."-General George Patton "I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them."-Thomas Jefferson "Any society that would give up a little liberty to gain a little security deserves neither and will loose both."-Benjamin Franklin |
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#3
02-05-2005, 06:53 AM
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I been rebuilding the 4th gen F body 7.5's for a while now. The guys in my club blow them up regularly. Sometimes we need a new posi, sometimes new gears. They have a torsen diff that has a non cone or clutch type posi. It knocks the teeth off the spider gears.
Do yourself a favor, either get a control arm kit to put in a A body 10/12 bolt, or gete a GN rear or moser/strange/aftermarket rear, be it 9" or whatever. You will be money ahead, trust me on that. Blow up a 7.5 two or three times and you can buy a new 12 bolt. |
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#4
02-05-2005, 08:46 PM
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by 455guy:
Anyone have a Southside mahine part number on the conversion corntrol arms? I've looked and find it. <HR></BLOCKQUOTE> 1328 is the SSM part number, if you can get one of these kits. I am building an 85GP and used a 68-72 12bolt. There is a guy that is now making the upper adapterbars for the 64-72 A Body. rears.
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1994 Formula 535ci NA CV-1 - single 1050 with c14 - 940hp@7000/825tq@5200 Pontiac Powered 4th Gen Project Progress 
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#5
02-04-2005, 07:49 AM
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by 455guy:
Yea, it's that whole 1000.00 for the gn rear I can't swallow!! <HR></BLOCKQUOTE> weeeeellll, think about the $$$ that will be spent if you blow the 7.5 up? whats that old saying, an ounce of prevention is worth a pound of cure? its entirely possible that a grenading 7.5 will cost than 1K to get fixed. or, you just get another 7.5, on the cheap, blow it up again, then the cycle repeats itself.
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costs too much |
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#6
02-06-2005, 08:25 PM
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Should add that NONE of the 7.5's I have destroyed were in drag cars...no sticky tires.
Did d some street racing but not with slicks, just plain street tires.
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"It is foolish and wrong to mourn the men who died. Rather we should thank God that such men lived."- General George Patton "Perpetual peace is a futile dream."-General George Patton "I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them."-Thomas Jefferson "Any society that would give up a little liberty to gain a little security deserves neither and will loose both."-Benjamin Franklin |
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#7
02-04-2005, 03:58 AM
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Ahh, so I need a stonger rear end cover? Got ya
 )!!
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#8
02-04-2005, 04:56 AM
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Does anyone make stronger spider gears???
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#9
02-07-2005, 09:14 AM
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If your looking for chevy 12 bolt, find one from a 64-66, they are about 60.5 " and wouldn't have to be narrowed. Only 1" wider than yours, you could probaly get by with your wheels. I think the g-body is about 59 1/2-59 3/4" wide.
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Illinois Outlaw Gassers 6.27@107 9.97@131 |
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#10
02-06-2005, 12:22 PM
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I worked with a guy several years ago who was too cheap to upgrade. He ran a mid 70's Monza with a Buick V-6 and manual trans. He broke so many cone type posi units I lost count. Even had a few axles come out after blowing up the side gears and loosing the "C" clips off the axle(s). There are several versions of this axle around, around 1988 they upgraded to the 7.625" version, pretty sure they have larger axles? We still see enough of them blown up by whimpy SBC's to avoid them.......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#11
02-06-2005, 01:07 PM
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455 guy, I think the stock units are destined to fail no matter what. I toasted mine with a mild 400-powered street car (at the time). Stock converter, and I never ran sticky tires, always street tires. I took off from a light one day and boom! It gave me a few signs in the weeks before it exploded, but at the time I did not recognize them for what they were. This was years ago...and granted, I was not easy on it.
I have since upgraded to an Auburn diff and Richmond 373's. Seems stronger than the original setup, but in my mind I know it is still a 7.5" 10 bolt. If it goes again I'll be looking at other options. At the time, I didn't know any better. Knowing what I know now, I'd leave the stock rear alone, drive it, and save for something stronger. Mine was good for about a year of hard driving before it coughed up some gears. Be nice to it, and it'll last longer...but what fun is that? |
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#12
02-05-2005, 10:28 PM
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Most of the ones I destroyed the teeth were stripped from the pinion......had a couple that blew the spiders.
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"It is foolish and wrong to mourn the men who died. Rather we should thank God that such men lived."- General George Patton "Perpetual peace is a futile dream."-General George Patton "I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them."-Thomas Jefferson "Any society that would give up a little liberty to gain a little security deserves neither and will loose both."-Benjamin Franklin |
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#13
02-04-2005, 05:15 AM
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Yea, it's that whole 1000.00 for the gn rear I can't swallow!!
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#14
02-07-2005, 08:53 PM
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It's too bad most of us A & G body guys don't have a few more options available. In my neck of the woods there are very few GN/442 cars let alone one that's ready to cough up a rear, and even fewer 12-bolt rears. I'm not 100%, but did I read that the 12-bolt started in 65, and there were few of them. Unlike the other Pontiac models withe 8.2 and 8.5 rears, it gets costly to upgrade.
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