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Old Dec 11, 2012 | 04:32 PM
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Default solid axle 1981 vette

Have a few questions about installing an autofab solid axle kit in a 1981.Is there any mods that have to be done for the pinion angle, such as cutting or fabricating the underside? Also, what would be the max rim and tire size that could be used? Any other information would be appreciated as well. I am fairly new to these things so if, and probably are, direct me to where to look for the info. thanx
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Old Dec 11, 2012 | 07:02 PM
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Could you be more specific as to what is included in the "Autofab" kit? Is this kit specifically for a C-3 Corvette? If not, there could be a LOT of fabrication involved.
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Old Dec 12, 2012 | 12:29 AM
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it would also help to know why you want to do this
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Old Dec 12, 2012 | 09:43 AM
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Contact Autofab with your questions. It's their kit. With the exception of wheels and tires, they should be able to tell you what you need to know.

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Old Dec 12, 2012 | 09:49 AM
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Default solid axle

Originally Posted by leadfoot4
Could you be more specific as to what is included in the "Autofab" kit? Is this kit specifically for a C-3 Corvette? If not, there could be a LOT of fabrication involved.
Thanx in advance and yes this kit is specifically for a c-3
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Old Dec 12, 2012 | 09:59 AM
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Default solid axle

Originally Posted by 7t9l82
it would also help to know why you want to do this
I put a 406 sbc with a lot of torque, and replaced two half shafts with dragvette shafts and u-joints, also the danna 44 has aluminum cap in on the drivers side and that makes it vulnurable to breakage and the cost to have the cap and housing machined and still not sure it wont braek, just want to do it once and done, this is not an auto cross vehicle, thanx
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Old Dec 12, 2012 | 10:40 AM
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Originally Posted by tringlec3
I put a 406 sbc with a lot of torque, and replaced two half shafts with dragvette shafts and u-joints, also the danna 44 has aluminum cap in on the drivers side and that makes it vulnurable to breakage and the cost to have the cap and housing machined and still not sure it wont braek, just want to do it once and done, this is not an auto cross vehicle, thanx
How much torque? What tires are you running?
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Old Dec 12, 2012 | 05:25 PM
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Originally Posted by tringlec3
I put a 406 sbc with a lot of torque, and replaced two half shafts with dragvette shafts and u-joints, also the danna 44 has aluminum cap in on the drivers side and that makes it vulnurable to breakage and the cost to have the cap and housing machined and still not sure it wont braek, just want to do it once and done, this is not an auto cross vehicle, thanx
Are you sure this is the direction you want to take? Back in the early 70s, when I used to go to the drags with my friends, there was a Chevy dealer from Niagara Falls, NY, that ran a big block powered C-3 in one of the Super Stock classes. That car ran a good sized slick, within the class's rules, and on EVERY run it left the line with the LF tire 4-6" off the ground.....with the IRS in place.
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Old Dec 12, 2012 | 07:50 PM
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IMHO you'd most likely take a huge hit on resale value down the road, as once you put a live axle into your 'vette it will no longer be a true sportscar.

So, you are aware that it's relatively easy to mate a 10-bolt IRS hoghead to your batwing, no? And, if you don't think an HD built 10-bolt will do, 12-bolt IRS conversion setups can be beefed up to handle 1000+ HP. FWIW, if you decide on doing a 12-bolt/batwing IRS combo, I've got a couple of bits on the drawing board for mine which you may want to consider.


...Yep, I said 12-bolt, IRS and batwing all in the same sentance.

Last edited by TheSkunkWorks; Dec 12, 2012 at 07:52 PM.
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Old Dec 12, 2012 | 10:05 PM
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once you put a live axle into your 'vette it will no longer be a true sportscar.
Based upon what definition exactly? I admit to bias, but can't find anything to support the statement that all sports cars have IRS.
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Old Dec 13, 2012 | 06:55 AM
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Originally Posted by bashcraft
How much torque? What tires are you running?
500+ft/lb at 3000rpm and still building some more. Street tires i would like to get that to the ground, so that means some real sticky tires
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Old Dec 13, 2012 | 07:05 AM
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Originally Posted by TheSkunkWorks
IMHO you'd most likely take a huge hit on resale value down the road, as once you put a live axle into your 'vette it will no longer be a true sportscar.

So, you are aware that it's relatively easy to mate a 10-bolt IRS hoghead to your batwing, no? And, if you don't think an HD built 10-bolt will do, 12-bolt IRS conversion setups can be beefed up to handle 1000+ HP. FWIW, if you decide on doing a 12-bolt/batwing IRS combo, I've got a couple of bits on the drawing board for mine which you may want to consider.


...Yep, I said 12-bolt, IRS and batwing all in the same sentance.
No, i wasn't aware that it is fairly easy to put a 10 or 12 bolt to a bat wing, i could be swayed to this idea, i do not have to have a solid axle conversion it is less expensive than usings the big name irs kits and or parts that are out there, yes cost is always a factor. I would be interested in what u have in the making.
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Old Dec 13, 2012 | 02:07 PM
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From: Graceland in a Not Correctly Restored Stingray
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Originally Posted by 97C5
Based upon what definition exactly?
Opinion, jaded by many years of exposure to sportscars and road racing. Any steps which detract from handling are necessarily in the opposite direction from the sportscar end of the automotive spectrum.
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Old Dec 13, 2012 | 02:12 PM
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once you put a live axle into your 'vette it will no longer be a true sportscar.
Oh oK

A good straight axle setup would appeal to me if I were looking for a vette with a hot motor it just makes sense
They can handle just fine doubt his resale will matter much at all. not like its a 67 BBC car. hes having fun thats all that matters
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Old Dec 13, 2012 | 05:39 PM
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Originally Posted by cuisinartvette
Oh oK

A good straight axle setup would appeal to me if I were looking for a vette with a hot motor it just makes sense
They can handle just fine doubt his resale will matter much at all. not like its a 67 BBC car. hes having fun thats all that matters
Maybe, maybe not...Think how short the springs would have to be, in order to fit within the compact confines of a C-3 chassis. There's practically zero frame in front of the rear wheels, to create a front mounting point for the springs, and the frame behind the wheels isn't much longer.

Back in the early 70s, one of my friends had a 63 'Vette vert, and he was having all sorts of rear end troubles. I really don't remember all the details, but a local "hot rodder", with some decent fabrication skills installed a solid rear end under the car. My friend moved out of state shortly thereafter, so I don't remember what happened to the car. I rode in it once, and I seem to recall it rode pretty poorly.
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Old Dec 13, 2012 | 06:05 PM
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Coil-overs would solve the space problem. But, the suspension geometry/dynamics of a live-axle compared to an IRS just plane suck unless you actually want a high rear roll center and zero camber gain.
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Old Dec 13, 2012 | 07:23 PM
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Buy a 90's mustang with a solid rear axle if you just want to drag race!
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Old Dec 13, 2012 | 07:42 PM
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if you tub it , this size will fit
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Old Dec 13, 2012 | 09:34 PM
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Ford 9 inch, h'mm hard to say the "F" word around Corvettes but they are tough and along with a four link, coil overs and tubs it will give you some 'stickage'. You have a good frame there to start with, weigh out the pros and cons...

I have gone this route on 63 Beaumont SD but there is no turning back once the first cut with the sawsall is made. I did not realize that I had tubbed and channeled a car that there was less than 200 hundred built. Oh well, "it takes a man to build a car, it takes a real man to chop one up".

Maybe some strong Tom's Differentails parts will tame that 'stump' pulling 406. Just my 5 cents.
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Old Dec 14, 2012 | 07:29 AM
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Originally Posted by TheSkunkWorks
Coil-overs would solve the space problem. But, the suspension geometry/dynamics of a live-axle compared to an IRS just plane suck unless you actually want a high rear roll center and zero camber gain.
I finally took a minute and logged on to the Autofab website, to look at their kit. It's pretty straight forward, a 4 link deal with coil-overs. What I dont understand, however, is how it locates the rear axle laterally, without a panhard bar.
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