I only used gear diff for the first 2 meetings at worksop.
ball diff is BY FAR the best thing to run at worksop in 2WD.
all of my setups from last year should be on the TD website.
this is probably the best starting setup to look at
http://www.team-durango.com/pdf/setu...24_02_2013.pdf
Tires make a HUGE difference there, I would highly recommend running almost worn-out mini-pins up front and rear tires that have had 1-2 heats on carpet to scrub them in ready.