BB:
I think people have mentioned that both are good trans. Also as mentioned I have heard complaints about both. Both give good customer service. So I will just give you my experience with my choice which was DTT.
After speaking with Bill at DTT and telling him the who, what ,when, where and how I use my truck he gave me his recommendation of what he would do. He mentioned that I was on the line for one or two parts for my use. Said you could use them but not a necessity since I was sort of on the line. Not a sales push at all on those other parts. Well I bit the bullet and headed up to his shop from Denver. Made a nice vacation out of it. What a difference. Vinney and Darren up there in his shop had my truck in at 9am and I drove away at 1pm after we had lunch there.
Fast forward 4 months. On vacation in NE Arizona at Canyon De Chelly. It is about as BFE as you can get on the Navajo reservation. There are a couple of towns not far but no shops of any kind. Anyway at a gas station filling up on my way back to camp to get ready to head to the Grand Canyon the next morning. I notice a puddle under the truck but pay it no mind as I just used about 2 gals of water cleaning the windshield. I stop at the park visitor center for the wife for a second as I walk back to the truck I again notice a puddle. Crawl under there this time and sure enough transmission fluid. Head to camp and break out the tools. It is leaking from the inspection plate. I am hoping that the tc plug has worked loose but no it is tight and appears to be leaking from up in there somewhere. No cell reception out there so I head to the closest phone about 20 miles away. It is tuesday 6pm. I call the shop and get Bill (suprised that they are still there). He tells me to check this and that and try this and that. After no avail he tells me I am screwed and need to get to a shop asap. By now it is 8pm, he has been hanging around waiting for me to call him back after each procedure. He asks me where I am at, tell him he looks on his map ands say boy oh boy you are out in BFE and really are screwed. My comment is YEAH I KNOW THAT ALREADY. I am sweating bullets at this point. He tells me where the closest installers are Phoenix 300 miles and ALBQ 200 miles. He gives me the phone numbers to call them. I am thinking there is no way a shop is still going to be open at 8pm. One no answer I leave a vm. I call the other. An answer thank god. It is his home phone number. I talk to him and he says if you can get it here I can fix it. I call Bill back and tell him where I am headed. He tells me to call him when I get there and the best way to get the trans to make it there (by the way I am pulling a trailer). Get there the next day (wednesday) about 1pm. I was supposed to load up on any trans fluid I could fine and just replenish it as the level dropped. So I would stop and check the fluid level every thirty minutes. To my surprise after the first stop/check it quit leaking.
Went to ALBQ, wife has family there so dropped off the trailer and while backing it in the spot the trans gets fairly toasty. Make it to the shop with ever higher trans temps. Low and behold what do I find at the address is a freaking Dodge Dealer. I am now at least safe in town but at a dodge dealer. I warily go in ask for the guy and he comes right out says bring the truck into the service bay. Truck won't move for about 2 minutes. Get it in he puts it up on the rack does his inspection and tells me what he thinks is wrong. Then he tells me that Bill had already called him first thing in the morning and told him that he was overnighting the parts (I had called Bill when I got to town, he didnt mention this). Installer says parts are covered by Bill but his dealership labor was not. No choice just fix it. He tells me the parts should be here tommorrow. Either in the morning truck or the afternoon not sure which. If on the morn truck would be ready thursday night if afternoon truck be ready friday afternoon. Well at this point it is being taken care of but my vacation is pretty much trashed. I talk with the wife and say the heck with it. Rented a car and drove down to Carlsbad Caverns on thursday am. Called the installer thursday from the road about 4pm. He says if I wasn't on the phone talking to you I would be done, just getting ready to take it for a test drive. I call back in 30 minutes he says come get it, shes done. I tell him I wont be back until friday night. No problem just come then. Well we dont get back until too late so I have to wait until saturday morning to pick it up. There she sits looking good. I pay my labor bill (900. 00) and drive off all is well. Head back to Denver on Sunday with no problems.
Talking with the installer on Thursday pm he tells me what he found. The front bushing had worked loose putting pressure on the front seal causing the leak. After a while it had worked its way underneath the front seal lip and stopped the leak. However trans pressure was very low which was caused by the front pump going out due to the leak. He replaced the entire front half of the trans- tc, pump, input shaft and hub etc etc. The overnight freight bill was 450. 00 alone. Not to mention another 2k+ in parts. All was covered except the labor.
I was so impressed with the speed, thoroughness and apparent quality of service that I hunted down the Dealership owner when I picked up the truck. When he approached me I could see in his face that he was ready for a royal butt chewing from an angry customer. He was very surprised to hear the glowing words of praise I had for his installer. Who he said was one of their best and showed me all his certifications and awards framed on the wall in the dealership.
Monday morning I call Bill to let him know what is up. His wife Shanti answered the phone. The very first thing out of her mouth was what is your credit card number. I sheepishly ask why half expecting to need to go into wtf mode. So that I can credit you the labor you had to pay, how much was it she says. I tell her, then she starts to ream me out a bit for not calling sooner. Said the original installer Vinney, had called her at home on sat and sun wanting word of how it was going. Bill then got on the phone said it was all covered and he hoped it all worked out ok etc etc. We I TRIED TO BY-PASS THE CUSSING FILTER chatted a bit about his certified installers and that they must not only meet the technical criteria he has set out there for them but also they must meet his personal character criteria like willing to take phone calls at home at night etc. Said the failure I had was fairly uncommon for the 47re and he had seen very few like that.
Anyway there is no way he could have gotten it taken care of any quicker or any better than what happened. Truck fixed in just over 24 hours with the parts shipped from Canada to ALBQ and no charge for any of it. Is this how he treats everyone? Not sure, but previous to my trans work from him he didnt know me from Adam so I would think it must be normal for them to go the extra mile. I obviously was not thrilled to find my new expensive trans with only 10k on it failing in BFE but he certainly stood behind his product 100% and then some. DTT has earned as much of my business as they can provide. Does Goerends have the same quality products and service, quite possibly but I have no personal experience with them though.
Attention: TDR Forum Junkies 
I have't touched any wires when since I originaly installed the switch. Whats the deal. Is it possible that the transmission switch installed the switch incorrectly or what.
