Pulling the trigger this week on my transmission build. I've been looking at valve bodies, and was wondering what the difference if any there is between ATS and BD? Also looking at rebuild kits, and looking for suggestions. I'm picking up a used 47re for the valve body core exchange and  to build then swap to decrease truck down time, and while its on the bench figured I'd go through it so I know whats going back into the truck.  Plan for the truck is right around 475 horse. Other parts I'm considering are a Mag Hytech tranny pan,  ATS input shaft, and BD low stall torque converter. I only want to do this once. 

 

 I'm open to suggestions.

I used to see a couple twin discs conveters, but nothing recent. 

 

Dynamic,

 

Assuming the twin disc is built well, wouldn't that offer a good low/middle ground converter for a mildly built cummins without needing a billet input? 

 

doubling the fiction surface is always good right?

It would definitely be better than a single, but not quite as good as a triple, which is the preferred configuration in a multi-disc converter. You don't necessarily need to run a billet shaft with a triple disc converter. Some you should, yes, but not all of them...

Sorry billet input is a general good idea for safety with pretty much any config. Generalize statement that errors on the side of caution. 

 

 

Understand your point about double vs triple.

 

My thought process is if a good single can hold 600ish ftlb without a hassle then a doube  should hold 1000 correct? 

 

Again not really sure if it is worth any "savings" but I would rather see people running a dual disc vs single ya know?

Yes, a billet input is a good idea in any scenario, but the myth that is floating around that you HAVE TO run a billet input if you're running ANY triple disc converter is simply not true... A good idea...? Absolutely...! Absolute necessity...? Depends upon the converter, but not in every case.

 

I run two converters behind the Cummins on a day-to-day basis. Both are triple disc converters; the Stage 3 and the Stage 5. I don't run any single discs. The Stage 3 clutch is rated at 1200 lb/ft of torque, and the Stage 5 clutch is rated at 1600 lb/ft. I am not familiar with any of the dual disc converters, but I would say your logic is sound.

 

My philosophy is to always run a multi-disc converter, and the triple disc is, by far, the most common configuration. 

I ran a single disc BD converter and VB rated for 450HP 750TQ with OEM input at 560 hp and 986 tq for many years as a sled puller and a few drags mixed in, sold it with over 150K on the clock and the tranny was still holding together fine other than a broken output shaft which was replaced with a billet other than that it was still OEM.

Well I emailed the shop I talked to yesterday to see if he had any kind of a spec sheet for his transmissions. He doesnt, but he did tell me that his heavy haul transmission gets a multi disc cast stator converter with all stock shafts, for 4800 bucks. The street series, get a true triple disc billet stator converter, billet input shaft, and billet flex plate for 6700 bucks. Both transmissions have constant flow high pressure valve bodies, billet multi ring servos and same clutch stack ups.

I'm not trying to be critical or argumentative, but those prices are unbelievably expensive! $4800 for a transmission with stock shafts is bordering on ludicrous...

 

It's also troubling to me that he hasn't taken the time to put together a complete itemized build sheet for each of his packages. I'd want to know what clutches he's using, and  in what configuration, what band, what brand of servos, what he means by "constant flow, high pressure valve body", etc... 

Couldn't agree more. 

I about tipped over when I saw the prices he quoted as well!

 

Anyone have experience with "Precision" brand tq converters? This is the converter company the tranny shop uses that is being put into my 2010 tranny rebuild.

There is Precision Industries, and there's Precision of New Hampton. I've used quite a few Precision Industries converters behind the 7.3 Powerstrokes, and a few Precision of New Hampton converters in various applications. Both seem to work just fine.

Precision of New Hampton Iowa is who they use.

Precision of New Hampton Iowa is who they use.

Should be fine. I've used a few of theirs over the years on some of the stuff that I don't have custom built. They seemed to work just fine. Good quality off-the-shelf stuff. No complaints...!