3.90 seems to work pretty well for me -- my gears are a 3.73, but the tire size is 225/50/16 - slightly shorter than a stock Stang-sized tire. That makes them work on my car just like a 3.90 would on a Stang.
jaakal - the limited slip (trak lok) feature of the rear end is present no matter what the gear ratio. If yours is spinning only one tire, then the LSD is 'tired'.
yeah both wheels spin the same direction, but the rear is shot....also, could by not adding the friction modifer cause the rear to only spin 1 wheel...the shop i went to i dont think added it
The friction modifier allows the 'slip' to occur without chattering. With no friction modifier it'll make racket/chatter when on low speed turns -- but shouldn't affect the ability to split the power to both tires.
The friction modifier allows the 'slip' to occur without chattering. With no friction modifier it'll make racket/chatter when on low speed turns -- but shouldn't affect the ability to split the power to both tires.