Is it an A518?

Actually if it's a 95 then the tranny is a 46RH, same as a 518, they just changed the naming designation in 92. The newer designation is a smart code. 4 is for four foward speeds, 6 is the load carrying capaicity, R is for rear wheel drive and H is hydraulic control. 46RE would be the same except for the E standing for Electronic control.