Using Low Gear
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Mountain Pass
Joined: Feb 2007
Posts: 183
Likes: 2
Using Low Gear
75k trans. is being overhauled after going out on a long down hill grade using low/first gear while pulling a 6000 lbs. trailer. Is there a known weakness in these tranys doing this? It was a 45 degree day. Had made the ten mile climb and let truck idle for 5-10 min. for descending. Trans. has been serviced at least twice maybe three times up to this point (once with a filter) with synthetic. Owned since new.
Postmaster
Joined: Jul 2006
Posts: 3,754
Likes: 1
From: Indianapolis
Doesn't sound like a "normal" problem, however, was it really necessary to go down in 1st gear? You didn't say how steep it was, but for you to HAVE TO use 1st the whole way, and for how long?? that may have been the culprit, probably fried your clutches in the tq converter. A tranny will usually go between 150 and 200k mile behind a stock diesel. Even more if you baby it and don't tow heavy.
Posting Guru
Joined: Mar 2008
Posts: 1,104
Likes: 5
From: West Tx
I can't remember if the factory trans locks the converter above a certain speed for manual 1. I know manual 2 locks at 30-35 on my truck, but 1 never does, unless I force it to. If the converter was unlocked the whole descent, I'd imagine the fluid temp would get pretty hot and cause problems.
