you would have had an abs sensor on the standard diff and u lost it when u changed diff....at least i think thats what it is anyway
Wire the abs light to the engine check light on the car so when the ignition is on the abs light is on along with the engine check light and when you start the car it goes off with the engine check light!!! Dont pull the bulb bcause they cop that straight off, especially after the 1st of april!!
Remove the abs unit its not working so no need for it remove a bit of weight, a braided hose kit can be bought on ebay for removing the unit..