Why u want to lock the diff completely ? You could lessen the rear grip by using the following methods: harder rear springs, harder damping oils, or harder tyre inserts for rear ). Or you could increase the front grip.
Completely locked diff usually useful if you cross country such as driving in rough terrain.
Uneven tyres wear usually occur when the diff lock is too tight.
speed demon: melted diff ? do you dare to swear
On Road : Xray NT1 , RX8 , T4 || Mugen Seiki MRX4-R , MTX4 , MTX3 prospec || Tamiya M03 , M04 || Top Racing Sabre FD2
Off Road : Xray XT8 || Hobao Hyper 8
Radio : Futaba 3PKS || KO propo EX-10 eurus