1994 wd21 pathy 4x4 , Here goes. This is the problem I have been having with my auto tranny. I drive with the OD off from start to 35 mph and turn it on.But lately the tranny has been slipping as I start to accelerate.It just won`t go into gear. It just revs up. I have been religous about fluids and I have even added some Tranny medic to it but the problem is getting to be a more frequent occurance. The pathy has an external tranny cooler. Do you think that the cooler could be blocked or the tranny is just done? I am sorry that I am so vague but I am not the greatest mech, Any help would be fully appreciated, Elvis