July 8, 201412 yr comment_685347 Research mini-spools some more. I've never used one but as far as I know they lock the diff in both directions, like welding the teeth together. This means it understeers as the locked rear wheels push the car straight forward, then it slides all over the place as the diff forces both rear tyres to lose grip together. You lose power as the tyres fight against each other too, but if you can get one wheel to lift off the ground partly it will spin easier. So they work fine in some corners and not in others. We filled in matching teeth in the spider gears so the diff works for maybe 1/4turn before one pair of gear teeth hit the filled in ones. This gave much better turn-in before it all let go in the rear. We're in for an LSD for the new car. Report
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