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 Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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