Mine does the same thing and its a 98. I have been worried about it but havent felt it in quite some time. It kinda shutters sometimes before it slams into OD too. Wonder if its the driveshaft when its low on grease?1998, 250,000 miles, tranny is fine. One issue since Day One: A solid "clunk" when going from a lower range to OD.
As in dropping a gear going uphill. When hitting the crest and the load drops, he bangs back into OD...
