My NV4500 in my k3500 was rebuilt recently by ammco when I was a 1000 miles from home and had no other alternatives. She seems to shift and work just like it should, but for some reason there is internal pressure causing the fluid to be blown out around the shift stick and onto the ground. Out of concern about ammco possibly putting the wront oil in it, I drained the fluid and refilled it with 4qts of proper sychromesh (a mix of two different types of Redline, IIRC) right after I got home from that trip. Also, painted the gaskets under the boot with the dark, tar looking gasket sealer (Formagasket or something identical anyway). It did not work. On a 150 mile round trip yesterday oil was seeping out around the plate at the base of the stick shift, in addition to serious dripping on the the ground. What should I look at first? Is there a breather tube that might be stuck shut? Or something else? Any help would be appreciated. That fluid is expensive.