I cant believe you found me so fast Mark!!!
All gears on the 6.7 need to be changed out,they are all a straight cut tooth.The crank and cam gear can be pulled with a heavy gear puller,to install them I heated them in the kitchen oven for 45 minutes at 250 F . the crank gear just falls into place,the came I had to lightly tap it into place.The oil pump gears have to be changed too,the common-rail pumps are smaller on the block side so the older pumps wont work,but its easy to swap the gears,they pull off easy and interchange