Corvette differential
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Torque or HP, probably designed in 61 for the 63 model 327s with no
thought to 427/454s to come.
They designed it to be a sports
car short wheelbase independent rear to go around corners.
thought to 427/454s to come.
They designed it to be a sports car short wheelbase independent rear to go around corners.
Last edited by Little Mouse; Aug 23, 2006 at 06:11 PM.
Tech Contributor
Joined: Aug 1999
Posts: 15,117
Likes: 3,912
From: Connecticut, USA
Sloppy stock posi set up, stress risers, egg shaped pin hole for the cross pin,76-79 ring gear bolts, early Eaton carriers with 10-18 spiders, a lot of abuse with slicks, HP, and launches.
Tech Contributor
Joined: Aug 1999
Posts: 15,117
Likes: 3,912
From: Connecticut, USA
They can be built to be pretty strong but you won't get that from a stock type rebuild.I took a eaton carrier that was hit by the pinion and cut into it. I tuned and polished it and set it up with 373 Tom's gears, Then put it behind 375 HP and gave it to my 20 year old and told him to hammer it. He had solid dual strips about 150' long, 5k hard miles later it still locks up in posi and has no clutch hammer, is quiet and leak free.
Thread Starter
Team Owner
Joined: Apr 2002
Posts: 62,198
Likes: 1
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
Sort of planning on a 750hp turbocharged motor. Planning on something around a 3.08-3.23 rear end.
Just gotta figure out how to make a rearend that wont keep breaking.
Just gotta figure out how to make a rearend that wont keep breaking.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Originally Posted by Guru_4_hire
Sort of planning on a 750hp turbocharged motor. Planning on something around a 3.08-3.23 rear end.
Just gotta figure out how to make a rearend that wont keep breaking.
Just gotta figure out how to make a rearend that wont keep breaking.
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Safety Car
Joined: Mar 2002
Posts: 3,780
Likes: 442
From: Southwest MI
Originally Posted by Guru_4_hire
Sort of planning on a 750hp turbocharged motor. Planning on something around a 3.08-3.23 rear end.
Just gotta figure out how to make a rearend that wont keep breaking.
Just gotta figure out how to make a rearend that wont keep breaking.
==> and/or search here to find 427HotRods' custom Diff setup (looks to be very strong)
BTW; i went with:
- Tom's BOE posi unit
- a 70's case (stronger than a 60's case)..... i selected one with no significant core shift, checked it for cracks, removed all the flash, went with the HD caps and bolts, drilled it for drain plug,
- Richmond 4.11s.
- HD cover
- International Axle BB style HD yokes. (Toms units are even stronger I understand, but i like the stock look)
- solid Spicer u-joints
- custom 3" 1/2 shafts
- new HD Spindles
- cryo'd everything except the Posi unit.
Worked fine in my car with a 575 HP 468 (soon to be replaced with a stouter 496), however i only used loaned slicks for a few launches....i'm a 15" 70 series street tire guy. if i have any spindle issues i'll go with Tom units there as well.
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Team Owner
Joined: Apr 2002
Posts: 62,198
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From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
Originally Posted by Gordonm
Toms 12 bolt conversion will hold that. Other than that you are probably asking for blown rears and halfshafts and spindles and just about everything else back there if you plan on hooking that much power up.
Safety Car
Joined: Mar 2002
Posts: 3,780
Likes: 442
From: Southwest MI
Originally Posted by Steve439
I didn't know that - what's the difference?
Racer
Joined: Mar 2000
Posts: 352
Likes: 0
From: Frisco, TX
If you check Tom's website, they mention that they are coming out with a Billet case in late 2006. Give them a call and see if this case will be able to accomodate lower ratios like the 3.36 or 3.08. Here is a link to the page with the billet case:
http://www.tomsdifferentials.com/catalog.asp?pg=22
pef427 is looking into a Fab9 solid axle for his car. This ultimately may be a stronger, cheaper and lighter solution than the Tom's IRS.
Either solution should be strong enough to handle 750 H.P. there are people in the low 9 second range using the Tom's setup, so they can definitely take the abuse.
http://www.tomsdifferentials.com/catalog.asp?pg=22
pef427 is looking into a Fab9 solid axle for his car. This ultimately may be a stronger, cheaper and lighter solution than the Tom's IRS.
Either solution should be strong enough to handle 750 H.P. there are people in the low 9 second range using the Tom's setup, so they can definitely take the abuse.
Le Mans Master
Joined: Oct 2000
Posts: 7,831
Likes: 5
From: Austin TX
Originally Posted by 66427-450
it's been a few years, but one of the recognized diff guys/builders told me that....... thicker in several key areas if i recall correctly.
