12 bolt

General racing discussion.

Moderators: mokangena, DN, scottab, Carl Blanton

Post Reply
User avatar
80BU
Posts: 463
Joined: Sun Feb 25, 2007 7:09 pm
Location: Carl Junction

12 bolt

Post by 80BU » Mon Nov 06, 2017 6:26 am

I might be interested in a 12 bolt rear end if anyone has one laying around.

pete
Posts: 17
Joined: Sun Jun 12, 2005 4:14 pm
Location: kansas

Re: 12 bolt

Post by pete » Tue Nov 07, 2017 9:05 am

For what?

User avatar
80BU
Posts: 463
Joined: Sun Feb 25, 2007 7:09 pm
Location: Carl Junction

Re: 12 bolt

Post by 80BU » Wed Nov 08, 2017 5:46 am

80 Malibu.

amcamx
Posts: 98
Joined: Sat Aug 13, 2011 6:21 pm

Re: 12 bolt

Post by amcamx » Sat Dec 09, 2017 5:06 am

I have had, 3700lb 13.20 Mopar, break the 8 3/4 rear end every 4 passes. I now have lighter cars.
The racers do things, to help the drive line last. Taller gears, loose conv, and bigger cam, for less low end torque. At 2,500 stall, with a 4,500 conv, the torque peak comes in, outside the stage beams, and spreads out the power.
An air bag, in the right rear coil spring, can keep it from bouncing back, which loads the drive line, and the car will leave level.
A posi, and stock axles, give more cush, and help save the ring and pinion. Just keep spares.
A Mopar 9 1/4 Dana, from a 75 and later truck, is stronger than a 12 bolt Chev, and have low cost at the salvage yards.

Post Reply