Transmission Bang - Page 2 - Chevy and GMC Duramax Diesel Forum
2011+ LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #11 of 22 (permalink) Old 01-21-2013, 08:54 AM Thread Starter
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Sounds like another just live with it, or live without the factory warranty.
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post #12 of 22 (permalink) Old 01-21-2013, 09:11 AM
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It will soften up around 5000 miles after the trans breaks in and part of it is the constant 'learning' the trans goes thru.....sometimes it gets confused as to what gear it wants and once the discs wear in (burnish) it won't jerk as hard on those once-in-a-while wierd shifts.

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post #13 of 22 (permalink) Old 01-21-2013, 09:16 AM
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you guys felt ok doing the trans learn on the H&S?

meaning the last step of going up to 80 mph with WOT?? ON HOT!

i dont have to do it right then and there once i tune would i, i can wait untill i get to an open stretch and plug the XRT back in and do the tranny stuff right?

Last edited by jwcgmc1985; 01-21-2013 at 09:41 AM.
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post #14 of 22 (permalink) Old 01-21-2013, 09:32 AM Thread Starter
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I have about 10.5k on it now, so I guess thats not too far from 5k. But from what I am hearing nothing to worry about.
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post #15 of 22 (permalink) Old 01-21-2013, 10:56 AM
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Yeah i guess your's is fairly broke in by now depending on how you drive. Maybe the fact that mines tuned and I drive it pretty hard forced it to break in faster. lol

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post #16 of 22 (permalink) Old 01-21-2013, 10:58 AM
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i drive like a granny!

been taking it easy all this time, 16800 miles!
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post #17 of 22 (permalink) Old 01-21-2013, 11:12 AM
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^^^sounds like that's about to change!

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post #18 of 22 (permalink) Old 01-21-2013, 11:15 AM
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post #19 of 22 (permalink) Old 01-21-2013, 04:42 PM
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Mine was perfect until 10000 miles then it started a horrible 6 to 5 downshift. Done it until 30000 when I deleted and reset the trans and its smooth as silk now.


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post #20 of 22 (permalink) Old 01-29-2013, 10:44 AM
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Had same issue. drive 60mph lightly hit accelerator until truck downshifts but it bangs.. took it to chevy dealer couldnt find anything but after further investigation chevy said there was a file to re-program TCM. It wasnt in any of the dealers tsb's or anything. it was like chevy was trying to hide it or say that there wasnt a problem... anywa, long story short there is an issue and chevrolet does have a file to re-program tcm.. shifts fine now.!
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