i have a 94 Toyota pickup 4x4 with the 3.0 v6. my rear differential looks like it has a bad seal and is leaking. went to auto zone to get a gasket and they asked for my gear ratio.? how do i find out what gear ratio i have?. i heard that Toyota FIPG ( formed in place gasket) works good. i plan on lifting my truck and putting on 35s, should i change the gearing's now sense I'm gonna have to fix the seal??? or should i wait till i get the 35s on? what gears should i get to go with 35s? any suggestions...