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I changed all of my tie rods this weekend . and when I went to torque them down to 67 ft. lbs. as per specifications. I found out that the castle nuts went on to far for the cotter keys to even touch the nut let alone go inside the slots. It is like the studs were to long. So when I compared old ones with the new ones they were almost a 1/2" longer. this was on the outter ( both left and right ) tie rod ends. of my ( 2000 EX 4x4 7.3 ). Oriley's said they were the right parts. every thing else looked good and fit good except for the castle nuts. SO NOW WHAT DO I DO.
I have the same problem after installing my DR crossover steering - some of the castle nuts that were supplied were too short to reach the cotter pins...
I know using extra washers is not the best if you CAN get longer castlated nuts, but once you get the cotter key in place, nothings going anywhere. I have to do this on helicopter flight controls sometimes, and it's accepted practice.
I have seen a metal cap that fits over a nut and it has points on it that would extend the castle nut so that the key would fit through it. One came with the tie rod that fastens to the pitman arm ( left inner tie rod I think ) But I dont know what the fancy cap is called.