I thought I would post up the results of my second go with the Spec-R gear diff. My first run with the diff I tried Mugen 1000wt diff lube with very poor results, this time I upped the diff lube to 3000wt with very positive results! After running four packs I was back up to my normal lap times. The rear of the car felt planted this time, so..so far so good. Now I just need to see how well it holds up compared to my Xray ball diff. Time will tell!