Originally Posted by jimlab1' date='May 21 2004, 10:50 PM

Actually, despite a significant increase in the size and strength of the parts involved, the aluminum '03+ Cobra 8.8" IRS differential assembly is about 7 pounds lighter than the cast iron original.



And, while you're on a roll, most people don't want one for drag racing. They want one to retain the handling the car came with while improving strength, decreasing weight a little, and getting a wide range of gear ratios in the bargain.



FD 36 lb. cast iron housing on the left, Cobra 14 lb. aluminum housing on the right.

http://www.rx7club.com/forum/attachment.ph...&postid=1380794



Cobra 8.8" ring and pinion on the left, FD 8.0" (203mm) ring and pinion on the right.

http://www.rx7club.com/forum/attachment.ph...&postid=1391549



FD Torsen on the left, Cobra 8.8" Zexel Torsen on the right.

http://www.rx7club.com/forum/attachment.ph...&postid=1423200



FD on the bottom, Cobra 8.8" on top.

http://www.rx7club.com/forum/attachment.ph...&postid=1423203



Cobra 8.8" differential, cradle, and FD rear subframe.

http://www.rx7club.com/attachment.php?s=&postid=2585932



And one more...

http://www.rx7club.com/attachment.php?s=&postid=2585938



Any questions?