Hi I had the same problem with my Yokomo SD LCG. I have rebuilded the diff and it was over. It did the front give some more overdrive by loosening the diff. It just won't slip but it also not too tight you can't turn the wheels to see the working of the diff. I also have soft springs in the rear and had springs on the front. On the front I have a oneway drive with special drive axles/cups by Atomic which gives it a spool-effect. I use Sorex on the front with medium inserts and rear MuchMore tyres with medium inserts. Inserts are by Atsushi Hara.
Hope this helps.
Last edited by MrUnlimited; 09-25-2007 at 03:56 AM.