Resurrecting the issue from this thread:
http://www.duramaxdiesels.com/forum/showthread.php?t=19974
By way of back story, I initially (in December 2009) called the builder that put together the transmission (NOT MIKE L)for me in 2007. His phone staff told me that he was unavailable, so I left a message describing the symptoms (transmission would not engage when cold, CEL, RANGE SHIFT INHIBITED message, etc.) When I did not get a call back after a few days, I called again. The person answering the phone said that I needed to replace the NSBU switch. I ended up doing so as outlined in that thread referenced above.
I only had 1 other repeat issue last winter that I wrote off to a single occurrence.
Fast forward to this winter...
Every time that the temperatures get below 30 degrees or so, I have the exact same symptoms. After getting tired of dealing with it, and not being inclined to throw another NSBU swithc at it, I called Tim Hecker with St. Joe Diesel and set up a time for him to take a look at my tranny.
It was not the NSBU switch. What I had been led to believe was a full Transgo kit my original transmission was not, as the boost valve was stock and had worn a ridge on the end that was hanging up, causing my problems. He also found problems with fit and wear in the clutch plates.
Tim carefully went through the entire tranny and got me back on the road again. The symptoms have been addressed, and the torque converter locks up a lot more decisively than it did before.
These guys do good work!
http://www.duramaxdiesels.com/forum/showthread.php?t=19974
By way of back story, I initially (in December 2009) called the builder that put together the transmission (NOT MIKE L)for me in 2007. His phone staff told me that he was unavailable, so I left a message describing the symptoms (transmission would not engage when cold, CEL, RANGE SHIFT INHIBITED message, etc.) When I did not get a call back after a few days, I called again. The person answering the phone said that I needed to replace the NSBU switch. I ended up doing so as outlined in that thread referenced above.
I only had 1 other repeat issue last winter that I wrote off to a single occurrence.
Fast forward to this winter...
Every time that the temperatures get below 30 degrees or so, I have the exact same symptoms. After getting tired of dealing with it, and not being inclined to throw another NSBU swithc at it, I called Tim Hecker with St. Joe Diesel and set up a time for him to take a look at my tranny.
It was not the NSBU switch. What I had been led to believe was a full Transgo kit my original transmission was not, as the boost valve was stock and had worn a ridge on the end that was hanging up, causing my problems. He also found problems with fit and wear in the clutch plates.
Tim carefully went through the entire tranny and got me back on the road again. The symptoms have been addressed, and the torque converter locks up a lot more decisively than it did before.
These guys do good work!
