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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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