Hey all,
I've got an 87, but it's carbureted so I normally hang in the bullnose forum. I've got a 460 with a dana 50 front end and a 1345 T-Case.


I live in a rain forest were the ground is pure clay. I have acerage and animals and at some point Im going to be clearing a section of my land and I want a t-case that isn't going to go "POP" at the worst possible time.


From my research, the two cases Im looking at are the BW 4407 and the NV 271. Ford replaced the 4407 with the 271 so that makes me think it's a better case.
Im going to be installing 5:13 or 5:38's in the truck and eventually an E40d or a 4R100 depending on which one is stronger, I haven't researched that yet, and that will put me right at 50 mph on road speed with acceptable rpm's. The only on road driving it will see are trips to the auction and possible trips to the lumber yard.


I do want this to be my "forever" truck. All reliable and tough running gear and expensive parts I consider "truck payments". So I'll be stroking out the 460 to get as much torque out of it as a 6.4 power stroke. (I hope). So I'm leaning towards the 271, but will it bolt to a E4od or a 4R100? That's my main question.

 

Even a BW 1356 will do what you want. You'll never break a 4407. A few people claim the 271 is stronger, but they don't have the data to back it up.

You're also not going to get 650 ft-lbs @ 2000 RPM like a 6.4 powerstroke without forced induction.

 

The big problem with the NV271 is
the COST$$$$$$$$

and then there is the problem that the splines are different

I agree with lead. 1356

 

Im shooting for 650 ft-lbs at 3500.....ish. I figure a 514 stroker kit with hydrolic roller cam spec'd for torque would do the job.
The rpm's are what's worrying me, I can get there with 5.13 gears but will the rest of the drive train live long with 650ft-lbs at 3500-4000 rpm? That's why Im thinking I want a really stout T case.

 

That Dana 50 front is going to be the short fuse in this equation IMHO.

 

My 97' F350 I just bought has a 4407. Good god its beefy as hell. I doubt you'd ever bust one

 

Nah, You'd still be hard-pressed to do that. Even a built GM8.1 (496) isn't making 650 ft-lbs @ 3500 RPM.

 

x2. He'll kill plenty of axle parts with 5.xx gears before he does anything bad to a t-case.

That said, 271 off a 4R100 has the correct 31-spline input... If you can find one for cheap.

 

a ~550 cube stroker, high compression, high lift/low duration cam (low duration relative to cubes, it will NOT look like a small block cam's duration), high flowing "small port" (Dare I use that term on a 460?) heads will net the power you are after, in the power band you'd like it to be in, no problem. If you mismatch one item, however, you'll end up with a powerhouse with upper end hp or something that is far from optimal overall.

I've always liked the bw 13fiddy6...although I've shattered a couple, broken tailhousings of a half dozen before I switched to fixed output, but I always have an extra laying around because they are so abundant at the jy.

the 4407 is a bear, and is a shame they aren't more abundant.....excellent case.

 

'89, The heads are where I have questions. I don't cant CJ ports obviously but I don't want the exhaust to be restrictive either. Im thinking of getting some of those import aluminum heads I see the pro head porters using on you tube. That way I can put in a CJ exhaust valve and match the ports to the gaskets and put them on a flow bench and see if they'll handle 550+ci. while keeping a stream of fast flowing air with a hydrolic roller cam.
Am I in the right ball park?
Oh and I cant run high compression there isn't a gas station close that has that kind of fuel, but I can run 10:1 comp

 

That said, 271 off a 4R100 has the correct 31-spline input... If you can find one for cheap.


Thanks, I'll keep that in mind.

 

Note the word IF

 

Ehhhh there's a lot to look at when selecting your heads...I'd start by selecting a cam to define some variables such as max lift and duration. I'm going to try to do this without writing a book about it....

What you wanna do when selecting cylinder heads is look specifically at the flow data at low - mid lift. Larger ports don't mean more flow once a cam and valves are thrown into the mix, so you can't just buy a set of heads based solely off intake and ex runner size. .600 is about the max lift you can run with a standard hydraulic lifter setup so let's just start there. You don't want heads that continue to increase flow above that lift, it'd be a waste of low lift flow because generally there is a tradeoff. You want great flow from low - mid lift that doesn't drop off or plateau until .600 or more realistically, .5-.55" lift. This is the only way to achieve your maximum low rpm power goal. You absolutely do not want heads that continue to increase flow through .650 and beyond, when doing your homework you'll notice that smaller port heads outflow the big port designed for high lift and rpm.

With 550 cubes, you can't look at cams or heads as if you were building a 460. The rpm range of each 460 cam and head combo would drop considerably if used on a 550
To match the increase in cubes you'll need to bump up duration, and it will cause no I'll effects in idle if you are selecting properly for low rpm hp. A custom cam is probably a must.

the compression is definitely going to put a damper on your goal, but 10:1 will still be a monster.

 

I highly suggest not going with an off the shelf cam, indtead get a custom grind from someone who knows these engines well, there are lots of good off the shelf grinds for a 460, but add a hundred cubes and the ballgame changes completely.