rockwells have 6.72 gears, there are no other options for them. 38's are to small to run with them, would be screaming at any speed. they are nice for driveshaft angles because the driveshaft goes into the axle above the gears, a very high pinion. Pinion mounted brakes tend to wear out the pinion bearings, but they also make brakes mounted by the wheel for them. You could probally get away with a beefed up dana 60 front and rear for what you want.

 

I agree, D60s with aftermarket axles and trusses should work. It sounds like a cool project. Please make sure to have a good sturdy roll cage attached to the frame. It sounds like you are trying to not go to high for safety. You may think of cutting the wheel wells for tire fitment. If you have a good body shop do the work it will look great and you will have a lower center of gravity.

 

you wont have any trouble steering if you have 4 wheel steering. It is easy to do with the rockwell axles. and an overdrive tranny would be the way to go, allison auto or clark or spicer 7spd. with minimum 40in tires.
sounds like the snowball effect. i think everybody is living trough you and your "dream truck".

 

What about Fords old 9 inch? 31 spline and 5 lugs might work....
Im guessing for the ease of the install the ford 9 inch might be the way to go. Either that or a GM 12 Bolt. but either one of them is going to have to be extreamly built up.

 

Ok, If ya figuring Rockwells to much. How about a D60 or D70 upfront with a D70 out back. They have a D80 Front but not sure of the wiht's they come in. With that kind of power I highly dought you can built a D44 upfront and a 9" out back to hold up to the power your making. The least I'd go is a D60 front and a D70 out back. Give this link a try and Click on the Dana Procducts Pic.
http://www.differentialeng.com/

 

Thanks for the link man!

 

For what you are planning to do and the components you'll be using I'd put in a Dana 60 front, Dana 70 rear, superior axles front and rear, ctm u-joints front and rear, box your frame for rigidity, make up some ladder bars and make darn sure your c-6 is beefed up enough. Sounds like a mean one

 

I'm just a Jeep guy but the statement about lift and best handling is an oxymoron.
Yes you will need some serious diffs, but the more unsprung weight you have the worse it will handle. The same holds true concerning the higher center of gravity. It sounds to me like you want to be able to drive it on the road and mabey race from light to light. You may wan't to consider some body work around the fenders to clear the 38s with a minimal lift.

Take your time and do as much work as you can yourself. You will be amazed at how fast you go through money when you start getting crazy with the mods.

 

A 9" behind 900 HP on 38"s??? That's a grenade waiting to happen. A GM 12 bolt isn't any better. Stick with D60 front and a 70 or 80 rear, like proeliator and I have already mentioned....

With Rockwells you'll need so much lift 38s would look tiny, all gearing issues aside. Having the pumkin on top of the diff kills any clearance you have between the engine crossmember.

Final note... If you use a C6 behind that kind of power (no matter how beefed) chances are you will burn them up on a regular basis. Pro, I'm guessing you've been through one or two of these with 44s and 600 HP???

Oh yea, why not use a NP205?? They are tough as nails and will take the power you want to make.

 

Thanks guys. Im starting to get a bombproof list going.

Would i run into any difficulties installing a D70 Front?

D60 Front and a Possibly 80 Rear

CTM U-Joints Front and Rear,

NP205 Transfer Case


Ok next is the transmission a 5 speed or maybe even a 6 would be nice.

 

Actually, the C-6 can be built to handle it (surprisingly so), but you have to really dump some money into it and then pair it with a top notch cooling system. I did indeed eat my stock C-6 but my latest C-6 built with my set up in mind has lasted very well. Don't know so much about the five or six speeds...you might want to look into what the ZF trannies can be built to handle. You shouldn't have any problems with a Dana 70 front, other than finding one. Seriously though, a Dana 60 front with Superior axles and CTMS will be fine. Same with the Dana 70 rear. It helps that you'll only be running 38s. I'm still drooling over your engine Guess I have hp envy with the measly little amount I'm pushing. Besides which, there just isn't anything cooler than a blower!

 

I am still having my worries about fitting my 38s under my fenders.... I want to have the largest tire i can possible fit under the truck while having a lowest center of gravity i can possibly get. if i have to i will go a little lower but nothing below a 36.

If there isnt much of a price difference between the D60s and D70s ill go with the 70. But sounding as tho there hard to find i will be running a D60. I would like to go with a beefier D80 in the rear since i may want to spin my tires every once in a while without having to worry about damaging something.

Does anyone know what gear ratios i should look for and lockers?

 

Probably something betwee 4.56 and 4.88 with your tire choice, depending on what range you want. If you don't care about tire wear, go with a spool in the rear, its the strongest (I'm assuming a rig like this won't be out when the roads are nasty anyways, otherwise I wouldn't recomend a spool). If you want it to be more versatile then stick Arbs in front and rear.

 

Fords ZF 6 speed manual

1st 5.79
2nd 3.31
3rd 2.10
4th 1.31
5th 1.00
6th 0.72
Reverse 5.23

 

I am still looking for a manual transmission with no real luck so far.
There just doesnt seem to be very many manual transmission rated for 1000 HP.
I have been thinking for the transfer cases a divorced NP 205 would be the way to go. Do you guys think this would be a stronger application?