I have a 1974 135 I am restoring, serial #9A198616,rear axle serial #10851, Left axle shaft 897 030 m2, right shaft 183 249 m2. Does not have diff. lock. I removed the axles to grease the bearings and check the preload which was too tight. when I reassemble the axles they bumped together with almost 5/8" gap with existing shims. Had .050 shims on right and .090 on left. If I add that many more shims my seals won't land properly. Wondering if I can grind off the inside end of the shaft of both shafts almost 5/16" and how true those ends need to be? Or am I missing something. have adjusted preload before on 35s and fords. 1100 hours on hourmeter.