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 Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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