I don't know if this would help but try changing the fluid again since that is when the problem showed up. It can't hurt at this point, make sure the right amount of the right stuff gets put in.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k