Drove my breadtruck home this past weekend from Tampa. I'm performing a 4bt swap on my durango. I have a couple questions reguarding performance and mounting a transmission to it.

1. In trying to squeeze some more power out of it, what should I do? Right now it's completely stock but what I was thinking was: A. Intercooler (doesn't have one right now), B. HTT turbo combo of some sort (maybe 12cm/stage 3?)?, a fuel pin or should I just tamper with the screw myself?

2. I'm going with a 98'sh 47re transmission, right now it's got the adapter for a chevy SB bellhousing (has TH400 mounted to it). Do I need a 89-98 trans adapter off a 6bt? Most importantly, where can I affordably get an adapter? lol

 

1. Intercooler wouldn't hurt, turn the pump up, and bigger injectors, then maybe just an hx35 or similar as it probably has a hx30 right now. Does it even have a turbo?

2. What is the 47re out of? As the one behind the 6BT and v10 has a larger bellhousing/pattern than the ones behind the v-8's. Try advanced adapters. If it is one from behind the 6BT than you need a block adapter from a 94-02(?).

 

Yes it's got a turbo, I'm not 100% on what it is but I believe it's a H1C

The 47re will be out of a '98 diesel ram. I'm gonna try and call advance adapters then and see what they say, just figured it be easier/less costly to snag a used one from somewhere.

 

Depending on the year, its probably a H1C build, probably equivilent to a HX30.


Look on ebay or the junkyards for one from 94 to 02, if you had to you could buy one new from cummins or dodge. Check the classified ads on here, sometimes you see them on here. Just beware, 89-93 adaptors will Not work, they are about an inch thinner the the one you need.

Have to ask, why a 47RE, do you have a way/plan to deal with the electronic portion of the trans, namely the gov. pressure sensor,selinoid and speed sensor in the trans. The ecm thats inplace now might be able to handle it if you get a throttle position sensor setup.

 

Thank you for clearing that up



Thank you also for clearing up the 89-93 adapters will not work.

Right now there's a 44re in there, which the information I collected from Wayne at APS Precision said that the electronics in the 44/46/47re's are all the same. So they'll actually hook right back up. I was worried about crank sensor etc. But wayne re-assured me that it merely uses the position of the throttle. Which I was sure I could use the TPS off a newer 6bt possibly, but he claims that the transmission uses something off the throttle cable itself.

 

His claims are correct, its called a Throttle Valve cable or TV cable. You might be able to snag something off a 1st gen dodge for that and shorten it for the 4BT. What does the th400 use, vacum? or is there a cable/lever going back there from the throttle. You seem to be pretty good a fabrication, so I'm sure you figure something out.

 

Ya, but before I even start on this swap I'm making sure I dot my "t's" and cross my "i's" LOL. The swap itself seems fairly easy. The motor literally relies on a 12v fuel trigger and power to the starter LOL. I'm gonna check on the T.V. cable deal. If not then most if not all 6bt parts are interchangeable but I highly doubt there anything vacuum assisted on this joker (has no vacuum pump from what I can see).

 

An intercooler would be a good idea if you can find a place to put it.

The typical 5.9 liter turbo upgrades are not going to work well on a 4BT because it's a smaller engine. An HX-35 would be as big as I would go, and that will probably be a little laggy. I think the best turbo would be an HY-35. It's the red-headed stepchild of the Dodge Cummins world because the 9 cm turbine housing is too restrictve. On a 4BT it will provide you with instant spoolup and plenty of air. They usally go pretty cheap on Ebay and the DTR and TDR classifieds.

 

Ya, at this rate I merely intend to do this for performance, I may do light towing but nothing that would phase a diesel. Could I just use the 9cm turbine housing off the HY-35 with a higher compressor trim? I don't think I intend to upgrade the governor spring so within the 2500 max rpm the turbo won't surge with such a small turbine?

Lastly, will I be able to run a big enough exhaust to try and keep EGT's down?

 

The HY-35 has a good sized compressor, as it was intended to feed a 5.9 at 245 HP. I don't think you will need a bigger compressor. The 9 cm housing is there for instant spoolup for emission purposes. It works fine on a stock 24 valve, but when you put a box on there the small housing causes toasty EGT at high RPM. There's plenty of air coming in, just no place for it to leave. There will be no surging problems, it's a stock turbo from Holset.

Why not put in the 3200 RPM spring? It's the best $12 you can spend on any VE pump equipped Cummins!

If you can fit a 3" exhaust under there, it'll be fine. You shouldn't have any trouble fitting 4" pipe under there, it's not like you have any worries about ground clearance.

 

I'm gonna do whatever I'm advised to do to squeeze power out of this joker reliably. So if a Hy35 powered a 6bt at that rate on my 4bt it should be an optimum choice? Can you tell me what years it came on?

The 3200 RPM spring is gonna take the RPM band up to 3200 right? What's the benefits of that? Is it really gonna be a draw-dropping experience to give the motor 700 more rpms?

So here's a short run down of what we have thus far:

HY35 turbo
3200 Spring
Intercooler
Crank Fuel
3" Exhaust (I plan on run straight pipe out the back LOL).

Will that put me in the 250hp/500lb.ft. margin?

 

Everything I've ever read about the 3200 RPM spring comes out to "OHMYGOSHISHOULDHAVEDONETHIS200,000MILESAGO"; for the $20 it costs, it seems to be a no-brainer.

In theory, whatever takes you to 375 with a 6bta will take you to 250 with a 4bta. (2/3's the power, right?)

If that's true, you'll need some injectors too. POD's should get you there for around $400...

And, for conversions especially, you might want to look at water/ methanol injection instead of an intercooler. It would serve the same purpose, only be more adjustable, not leaky and would take up much less room.

 

That is a good theory to base it on (with the power).

I did look into the water/meth injection systems. I didn't know how much of a hassle running injection would be? I also didn't know that they basically replace a intercooler. I do have room between my condenser and bumper for a I/C though.

 

HY's came on '99 - '02 automatics and '00 - '02 5 speeds (but NOT 6 speeds) AFAIK.

The 3200 RPM spring makes a big difference because it gives your right foot more control over the fuel. The "throttle" response is amazing. The extra 700 RPM is nice, too. It's well worth the price and there are NO downsides.

The Begle is right that you will need injectors to hit your power goal. Which ones you get will depend on your budget and the intended use. If it's just a play truck where fuel economy and clean exhaust are not a factor, the POD's are the best bang for the buck.

If you have room (you obviously have the capability) an intercooler would be good to have. Water/meth has similar effects to an intercooler, but water/meth with an intercooler is even better.