I cracked the case of a THM-400 in an 89 2500hd chevy. Would back up a slight incline with a loaded trailer about and park with pressure on park pawl. did this about once a week for 3 years. When it finally gave out tried to replace the case and found most used cases from that era had the same issue. Finally found a good replacement and usually had someone with me to wheel chock before I put in park as well used the parking brake before putting in park. That transmission outlasted the truck. Since then I avoid putting myself in that situation.
I had also learned that the THM transmissions were never designed to backup with load or inclines. Never saw one apart that the reverse bands weren't bad in. Great transmissions for forward pull.
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Today's Featured Article - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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