Moses , In My Jeep zj 1994 4.0L engine AWD trans, do i need to re gear if i will use a 30- 31 tires and what gear and where to buy this gears. can i ask you regarding the TPS in the ZJ,does it affect kickdown or its the TCM that control this shifting? sometimes my i experience is the it kickdown only up to 2nd gear and sometimes it goes to 1st gear, is it the adjustment of the kickdown cable ? is it lose or is it to tight? also you advice me before regarding the anti return valve in the trans i cannot locate it, also where i can buy this valve how do i check if its ok? , please advice me With all my Thanks. Cheers:, Mario Bedayo Philippines