I have an 86 Bronco with a 460-C6-NP205. I am going to put a set of one ton axles under it (twin D60s' or a D60 and a (gasp!) 14 bolt), and lift it 10-12 inches, using coils and four links, and I want to run duel transmissions. I want to have 2 NP435 in a row behind the 460, via a coustom adapter, but if I do that the rear ouput shaft from the transfer case would be at aprox. 45 deg , due to the lenth of the two transmissions and the transfer case, along with the short wheelbase of the Bronco. What I was thinking is mount a divorced transfer case under the transmissions in the middle of the truck backwards, so that the front and rear driveshaft angles would be somewhat sane. I just don't know how to transfer the power from the output shaft of the rear transmission to the transfer case. Originaly I thought a transfer case on the transmission with the front output shaft going to the input shaft of the lower transfer case might be the answer, but I ruled out that posibility for the weight factor (A big block, two transmissions and a NP 205 weight enough already!) The option I am toy ing with now is actualy an Idea I took from the Monster truck Gravedigger. At the Gravediggers gift shop in eastern NC, there is an early Gravedigger out front with no motor or transmission, but the rest of the drive train is in tact. They seemed to use two identical home made one speed, full time transfer cases to distribute power. As I recall, they had two pullys, with U joint yokes, front and back going through the center of the pullys. for belts between the pullys they used, get ready for this, 4-6 inch wide sections of tire. The transmission was conected to the upper one of these home made transfer cases via a short drive shaft to the top, front U joint yoke, and the botom U joint yoke was conected via a short driveshaft to the top U joint of the second transfer case, which did the spliting at the bottom. It seemed to work for them for a while (I'm sure they use a 2 1/2 ton TC's now), but I'm not sure I would trust an inertube to the 500 ftlbs of torque my engines putting out, compounded by a 14:1 reduction in both transmissions. I was thinking also some type of roller chain, perhaps a quad roller. Any ideas would be a great help. Thanks all!

George
86 Bronco W 78 460/C6/NP205

 

Sorry- can't help you with your t-case questions but I can help you with the driveshafts. A few months ago- I was looking for a high-angle CV driveshaft for the rear of my Bronco and I came across this company, Arizona Drivelines.

http://www.gloeco.com/highangle.htm

I ordered and installed a high-angle shaft from them and it is very well made and works beautifully. No other company I know of makes CV joints with a range like this company and the prices are very good. My shaft ran me $280 and they had it in my hands for me the next day by special request. Maybe the monster truck shaft is what you need?


Dustin Siebert
mrlaserboy(No Email Addresses In Posts!)
Registry: http://www.superford.org/cgi-bin/sf.cgi?uid=default&vr2=1&ID=201
Home Page: http://www.fortunecity.com/silverstone/gear/40
'88 Bronco XLT 302EFI/AOD/BW1356/44IFS with 8 lugs(open)/10.25 FF(Lockright locker)/4.56/6" Superlift complete/35's-street/38.5's-trails
2 BIG BRONCOS 4X4 CLUB - GREAT LAKES CHAPTER

 

Thanks Dustin, I really apprecate that! I'll bust out the tape mesure and see if I can use one of those. By the way, Your truck look real tight!

George
86 Bronco W 78 460/C6/NP205

 

Another idea: www.offroaddesign.com should have their "Doubler" (a 203 range box in front of a 205)out on the market by now.
Over 100-to-1 is doable...with 4.11s! The driveshaft length would be greater, and U-joint angularity less a problem with this shorter setup over dual 435s. Still, dual 6.69s...

I understand the 14-bolt over the Sterling 10.25, by the way.

Eddie

 

I agree Eddie, the 14 bolt is a monster. I've even been contemplaing using a 14 bolt differential housing and inards with Coustom tubes and shafts and Dana 60 knuckles (or even hummer knuckles for extra lift). Thats probably a long way down the road (I need to do this transmission thing first) but I'd be the only kid on my block with a Big block Bronco with 16 forward gears (before the transfer case) and duel 14-Bolt axles. Mabey I should go ahead and box the frame befor I get to deep into all of this.

 

Box that sucker, by all means! 400 hp is easily doable with a mild 460, and dual compound low is roughly 44-1 at second transmission output!
Eddie