Recommendation for high performance rear differential rebuild
Thread Starter
Pro
Joined: Oct 2009
Posts: 523
Likes: 4
From: Calgary Alberta
Recommendation for high performance rear differential rebuild
Hi All,
Wondering if you can recommend what should be done to a 77 rear differential and driveline components to make it handle 600 to 700 ft/lbs of torque? I'm already planning on using Denny's 3 inch half shafts and spicer 1350 solid u-joints, but not too sure what should be done to the differential and other components to allow the entire driveline to handle the torque.
The trans will be a Keisler SS700 with the included driveshaft and clutch components.
Thanks in advance for your recommendations.
Wondering if you can recommend what should be done to a 77 rear differential and driveline components to make it handle 600 to 700 ft/lbs of torque? I'm already planning on using Denny's 3 inch half shafts and spicer 1350 solid u-joints, but not too sure what should be done to the differential and other components to allow the entire driveline to handle the torque.
The trans will be a Keisler SS700 with the included driveshaft and clutch components.
Thanks in advance for your recommendations.
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 39
From: Fremont CA
Vette differential will be really taxed at that power range. Should do a SUPER10 bolt build or 12 Bolt if you can find the parts even with those parts you need to be careful with Vette differential.
Instructor
Joined: Feb 2008
Posts: 113
Likes: 1
From: Raleigh NC
St. Jude Donor '13,'15,'17,'18,'22-'23-'24-'25
I've never bought anything for these guys but have talked to them about their set ups and mods and they seem well sorted out.
http://www.duntovmotors.com/vintage-..._driveline.php
http://www.duntovmotors.com/vintage-..._driveline.php
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Drifting
Joined: Jul 2002
Posts: 1,995
Likes: 110
From: Garland Texas
It depends on how you plan on driving it. Big block cruiser with limited spirited driving or do you want to lite the tires up at 100 kph in 3rd? Either way you will have to change to 30 spline stub axles and 31 spline spindles. The question is how long will the carrier last. The stock 10 bolt carrier will not handle very many hard full throttle shifts before it snaps in half. The 12 bolt conversion costs twice as much but you won't break it. There's nothing wrong with the Denny's halfshafts but you are limiting yourself with the 1350 u-joints and flanges. The flanges can be upgraded and I doubt you will break the u-joints but you have to factor in rapid wear and replacement costs versus running the 1480 joints.
Mike
Mike
Thread Starter
Pro
Joined: Oct 2009
Posts: 523
Likes: 4
From: Calgary Alberta
It depends on how you plan on driving it. Big block cruiser with limited spirited driving or do you want to lite the tires up at 100 kph in 3rd? Either way you will have to change to 30 spline stub axles and 31 spline spindles. The question is how long will the carrier last. The stock 10 bolt carrier will not handle very many hard full throttle shifts before it snaps in half. The 12 bolt conversion costs twice as much but you won't break it. There's nothing wrong with the Denny's halfshafts but you are limiting yourself with the 1350 u-joints and flanges. The flanges can be upgraded and I doubt you will break the u-joints but you have to factor in rapid wear and replacement costs versus running the 1480 joints.
Mike
Mike
I will send you a PM for some pricing and options. I believe Stinger12 mentioned you are one of the best persons to contact about having a differential built.
Thanks
Don
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Whatever else you do, your driveline will live much longer behind a 15# flywheel (SFI, of course). You may have to brush up your shifting skills a bit to keep up, but with 700 TQ's you just don't need a heavier one.
As for the diff itself, I've learned (more than once) that with serious power you don't have to be drag racing to break a stock 10-bolt. I went the 12-bolt IRS conversion route.
As for the diff itself, I've learned (more than once) that with serious power you don't have to be drag racing to break a stock 10-bolt. I went the 12-bolt IRS conversion route.
Melting Slicks
Joined: Nov 2003
Posts: 2,362
Likes: 1
From: San Antonio TX
I have to agree to give Mike a call. GREAT GUY. 
But even though this might be an odd question. With that much power that you wish to put down why go with a standard shift instead of an Automatic?
And Automatic would be so much easier on the drive train. And you can concentrate on steering the beast instead of Shifting lol.
But even though this might be an odd question. With that much power that you wish to put down why go with a standard shift instead of an Automatic?
And Automatic would be so much easier on the drive train. And you can concentrate on steering the beast instead of Shifting lol.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
I have to agree to give Mike a call. GREAT GUY.
But even though this might be an odd question. With that much power that you wish to put down why go with a standard shift instead of an Automatic?
And Automatic would be so much easier on the drive train. And you can concentrate on steering the beast instead of Shifting lol.
But even though this might be an odd question. With that much power that you wish to put down why go with a standard shift instead of an Automatic?
And Automatic would be so much easier on the drive train. And you can concentrate on steering the beast instead of Shifting lol.
Don't mean to flame you, but that doesn't hold true here, as the OP has stated AX & RR intentions. A good driver can much better utilize the trottle to control a car during hard cornering with the direct connection of a manual vs a slush-o-matic. Besides, one ought best already be in the correct gear well before it's time to begin transition back to throttle for corner exit anyway.
Le Mans Master
Joined: Feb 2005
Posts: 6,954
Likes: 0
From: New Jersey
It depends on how you plan on driving it. Big block cruiser with limited spirited driving or do you want to lite the tires up at 100 kph in 3rd? Either way you will have to change to 30 spline stub axles and 31 spline spindles. The question is how long will the carrier last. The stock 10 bolt carrier will not handle very many hard full throttle shifts before it snaps in half. The 12 bolt conversion costs twice as much but you won't break it. There's nothing wrong with the Denny's halfshafts but you are limiting yourself with the 1350 u-joints and flanges. The flanges can be upgraded and I doubt you will break the u-joints but you have to factor in rapid wear and replacement costs versus running the 1480 joints.
Mike
Mike
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Don't mean to flame you, but that doesn't hold true here, as the OP has stated AX & RR intentions. A good driver can much better utilize the trottle to control a car during hard cornering with the direct connection of a manual vs a slush-o-matic. Besides, one ought best already be in the correct gear well before it's time to begin transition back to throttle for corner exit anyway.
Melting Slicks
Joined: Nov 2003
Posts: 2,362
Likes: 1
From: San Antonio TX
Don't mean to flame you, but that doesn't hold true here, as the OP has stated AX & RR intentions. A good driver can much better utilize the trottle to control a car during hard cornering with the direct connection of a manual vs a slush-o-matic. Besides, one ought best already be in the correct gear well before it's time to begin transition back to throttle for corner exit anyway.
Row Away.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
The 12-bolt IRS conversion has eliminated the diff breakage issue for me, and the lighter flywheel has extended the life of everything else downstream of the crahkshaft.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I went with a Tom's 12 bolt 4.11, 3 1/2" Tom's halfshafts with Tom's 30 spline flanged stub axles and Tom's 31 spline flanged spindles. Cost me almost $9000 with the rebuilt offset trailing arms. Will handle 700 HP and a manual trans easy. Tom's don't build them anymore. Mike Dyer or Gary Ramadei with Tom's parts if you can get them. I know the inners and outers were on BO for a long time.
Last edited by 63mako; Mar 14, 2013 at 01:01 AM.