Billy @ BRC Diesel here,
First of all, I'm just a parts changer actually. I did build this trans for a truck that I couldn't test drive when I installed the trans because of engine problems.
Second, I am quite confident this is not a hard parts problem. It is certainly electrical related. This is reinforced by the fact that the problem (which was there before the truck came to me in non driveable condition) is intermittent and somewhat inconsistent. I did send the resistor to "try". Not as a band aid fix, but because it has worked before, after it was recomended by Dave Goerend. It's his products in the trans. I've had several conversations with Dave about this trucks problems, this was suggested as a first step to try. After that, it would be easier to get the truck here and put a scan tool on it and get some input, rather than speculation. It might be a problem with the pcm, or there might be a problem with the spliced wires near the connector plug at the trans. Doubtfull though, Matt has checked the wires and all grounds, etc. several times along with numerous electrical connection plugs and such. It just likes limping when it wants to. Electrical gremlins can be a *****. Over the years, I've spent a lotta time with od and lockup "hunting" issues. The cure is not the same on each truck for this common problem either. Out of the thirty one 618 trannies I've built so far, two have had this "no first gear takeoff" problem. A simple resistor cured the first one.
And third, not that anyone really cares about my personal problems anyway. I AM very hard to get a hold of often. I am a "one man show", meaning I can either work under a truck or talk on the phone, seldom both at once.
Also, my son's mother, who lives in a wheelchair, has been either in the nursing home or in the hospital (back and forth 4 times) since July 25th. Hasn't been in her home since July and is still in a nursing home right now. Looks like she may never get to return home either. We have a sixteen year old son who gets a bit of my time also. Seeing his mother go from walking and driving to having NO use of her legs in less than two years is kinda rough on a teenage mind.
I turn my cell off in the hospital and it doesn't have voice mail anymore, so it is recommended to call the business phone and leave a message.
I'm not trying to solicite sympathy here or make any excuses. Just admitting that I'm hard to get a hold of. Call it an excuse if ya'll want to, don't matter to me. Call the business phone and leave a message.
I've been in business six and a half years and have never, ever evaded any problems or failed to back up anything I do on a customers truck. It's easy to call yourself a business and just sell parts. I guarantee everything I do, to the best of my ability and within reason.
This trucks problems are just hard to fix over the phone or internet. Sometimes, ya just gotta get your hands dirty to fix things.
I didn't mean to stray off subject. I just can't fix things online.
Cousin Billy