Drove my Z to a show last weekend, engaged it on the way and it responded as it should, parked it inline with the rest of the older cars. It sat there for 6 hours, so after the show I cranked her up placed it in gear with no responce, after several tries to engage the rear axle, by engaging and disengaging the Columbia it finally egaged. I checked for vacum leaks and it was ok.I replaced the seal a few years ago It worked perfectly on the way home. Any comments please. Zman