Originally posted by Denney
Berger - You're in luck...mostly. I just finished building my FK & upgraded to a spring steel front diff (thought it might hold up better in mod racing), & weighed my diffs before assembly. The standard FK rear diff & one-way both weighed in at almost exactly 20 grams (.7 oz), the spring steel diff came in at 25.5 grams. Can't help on the original (pre FK) style diff.
Denney
Thanks, it doesnt matter about the last one as thats whats in my car (evo 2 with FK bits) so ill just have to wrench it to bits and weigh it up. I can see it being 30g+ easily for it so i guess it is probably worth buying two spring steel diffs or the lightened ones....