cj10jeeper said:Hi it's a common problem and been discussed on various boards (and here) many times. Shame you had to have an $1800 hit
Try this link as it's very clear to follow:
http://www.zpost.com/forums/showthread.php?t=63033&highlight=top+drain
tec243 said:I'm guessing the upper drain isn't readily visible as I haven't looked into this so working on my post count! But, can you run the snake up from the wheelwell and push through the blockage then vacuum around the motor area to remove the blocking material ??