What about these, I ran them in my Losi truggy for...ever and they are great. Now what cup for the Savage and still being able to use the 8x16 bearing's? Kyosho's and who has the strongest spiders?
http://www.novarcproducts.com/diffcups.html
Or these...
http://cgi.ebay.com/DIFF-CUP-Hot-Bod...item5adeab63f8
With these..
http://www.amainhobbies.com/product_...ntial-Gear-Set