This is the second time 6th gear has broken while driving 60 mph.
The first time was 19k miles ago. I'm not sure I can afford this rebuild,
but Standard Transmission in Ft Worth has my truck and I'm awaiting for the verdict.
The conclusion I have come to is that the rear wheel/wheels are coming off the ground after hitting really bad rough spots in the road. This might seem pretty far fetched, but it is a common occurrence with both instances.
The first time I was towing trailer and load 18000 lbs up hill. After hitting the bumps in the road the sound of broken teeth began. I did not recall hearing the engine revving up or did not notice the tach jumping up. The bumps came up quickly without any notice.
The second time I was towing trailer and load of 22500 lbs on flat ground. The bumps were several in a row and I did release the accelerator after the first ones. When resuming the broken teeth sound started again. O boy,
I knew what this meant.
Has anyone have any other conclusion that may cause this action? I just have never heard of wheels bouncing off the ground before and I'm not sure this could even cause the gears to break. But it is a fact and a very expensive fix.
The trailer is a gooseneck 40' flat bed. The weight on the trailer neck was (guessing) 3-5k lbs. Truck tires are stock size w/80lbs air, shocks appear to be working fine, the overload springs have 2-1/2" blocks.
The highway bumps that I refer to I would call the bouncy kind not the washboard kind.
I would appreciate any responses and especially anyone with the same problem.
Thanks guys and TDR
The first time was 19k miles ago. I'm not sure I can afford this rebuild,
but Standard Transmission in Ft Worth has my truck and I'm awaiting for the verdict.
The conclusion I have come to is that the rear wheel/wheels are coming off the ground after hitting really bad rough spots in the road. This might seem pretty far fetched, but it is a common occurrence with both instances.
The first time I was towing trailer and load 18000 lbs up hill. After hitting the bumps in the road the sound of broken teeth began. I did not recall hearing the engine revving up or did not notice the tach jumping up. The bumps came up quickly without any notice.
The second time I was towing trailer and load of 22500 lbs on flat ground. The bumps were several in a row and I did release the accelerator after the first ones. When resuming the broken teeth sound started again. O boy,

Has anyone have any other conclusion that may cause this action? I just have never heard of wheels bouncing off the ground before and I'm not sure this could even cause the gears to break. But it is a fact and a very expensive fix.
The trailer is a gooseneck 40' flat bed. The weight on the trailer neck was (guessing) 3-5k lbs. Truck tires are stock size w/80lbs air, shocks appear to be working fine, the overload springs have 2-1/2" blocks.
The highway bumps that I refer to I would call the bouncy kind not the washboard kind.
I would appreciate any responses and especially anyone with the same problem.
Thanks guys and TDR