Some Jeeper was trying to tell me that the Viper and a Grand Cherokee use the same aluminum D-44. I can't believe that a d-44 would stand up to 500 ft lbs of torque.

It's a jeep thing I guess.

I know some of the vetts used a alum center D44 center section. The Heep motors would be OK with a alum 44 but a Viper or Vett?

Not the 44 version but here you go:

http://cgi.ebay.com/ebaymotors/aw-cgi/eBayISAPI.dll?viewItem&item=599048054

humm isnt the grand cherrekee (sp) have solid axles front and rear? the viper is IRS and yes it uses a version of the dana 44 center section.

Originally posted by TrailRunner
humm isnt the grand cherrekee (sp) have solid axles front and rear? the viper is IRS and yes it uses a version of the dana 44 center section.

yea Vipers arent solid axle. I think they do have aluminum housings like vets. From what I have heard you dont want a grand chero D44. :D Just my opinion

kind of off the subject but you can't get lockers for that aluminum Dana44.

I dont think the internals are not quite the same. I think Don-A-Vee offers a detroit locker for g-cherokee D44's. I think the gears are a little different too because i thought I remember hearing that G-cherokee D44's have limited gear ratio's and there super expensive too. Just what ive heard not fact. :D

Yeah, I just checked the list ony my web page. Vipers are listed as Dana 44's. :)

J. J.

I dunno, fom what the owner of a dealer down here told me, the Viper has an IRS D60 in the rear.

605529 CHRY 44 REAR 1993 1/2 VIPER
605648 CHRY 44 REAR 1994-95 1/2 VIPER
605752 CHRY 44 REAR 1996-97 VIPER
606014 CHRY 44 REAR 1998-98 1/2 VIPER

Those are the listings directly from the Dana Catalogs. The first number is the bill of materials number. I think the rest is self-explanatory. The complete listing from 1978.5 - 1998.5 can be found at my web site at the bottom of the index page. It was the first thing I ever posted. www.patooyee.alloffroad.com

J. J.

I guess the 10 bolts in early novas held up to the beefed motors thay put in them, Its a whole new world in the drag racing department, things hold up there that would snap while wheeling,

Torque alone doesn't break shafts; the multiplication of torque does...

Viper

500 lb/ft (engine torque) X 2.66:1 (first gear ratio) X 3.07:1 (rear end ratio) = 4083.1 lb/ft of torque

Divide that by 2 since an open differential theoretically splits the torque load between the shafts and you end up with only 2041.55 lb/ft of theoretical max torque on each shaft.


Grand Cherokee

295 lb/ft (engine torque) X 3:1 (first gear ratio) X 2.72 (transfer case ratio) X 3.73:1 (rear end ratio) = 8,978.856 lb/ft of torque

Divide by two for an open diff gives you 4489.428 lb/ft of torque.

More than twice as much torque as the viper shafts see when the Grand Cherokee transfer case is in 4-lo. :nuke:


HTH,
Jake Harsha

Torque multiplication is a major factor.

I think tire size would be one too.

How much torque is necessary from the axle to the tire before it breaks the friction w/ the ground and spins?

Much more torque required from the axle/diff for a larger tire than a smaller one.

And cars are lighter than trucks too, which also affects the amount of friction. Meaning the tire will spin easier w/ less weight on it...

I'm not sure how well I described that, but... :p

Originally posted by Jakesteramalamajama
Torque alone doesn't break shafts; the multiplication of torque does...

Viper

500 lb/ft (engine torque) X 2.66:1 (first gear ratio) X 3.07:1 (rear end ratio) = 4083.1 lb/ft of torque

Divide that by 2 since an open differential theoretically splits the torque load between the shafts and you end up with only 2041.55 lb/ft of theoretical max torque on each shaft.


Grand Cherokee

295 lb/ft (engine torque) X 3:1 (first gear ratio) X 2.72 (transfer case ratio) X 3.73:1 (rear end ratio) = 8,978.856 lb/ft of torque

Divide by two for an open diff gives you 4489.428 lb/ft of torque.

More than twice as much torque as the viper shafts see when the Grand Cherokee transfer case is in 4-lo. :nuke:


HTH,
Jake Harsha

I thought all of the torque went to one tire in an open diff, and it got split evenly between two when the rear is locked.

Your point still stands, but I think the end theory is incorrect...or maybe I am, but I don't think so. That's why open diff cars spin the tires so easily

Which is another point. With all of that torque going into a car diff with ~24" tires you get a lot of wheel spin which equals lost energy/power/torque. But all of the torque in a 4x4 get sent to usually 35" and up tires that are designed for some SERIOUS traction so all of the energy is not lost as wheel-spin as it would be in a car.

Originally posted by ErikB
Torque multiplication is a major factor.

I think tire size would be one too.

How much torque is necessary from the axle to the tire before it breaks the friction w/ the ground and spins?

Much more torque required from the axle/diff for a larger tire than a smaller one.

And cars are lighter than trucks too, which also affects the amount of friction. Meaning the tire will spin easier w/ less weight on it...

I'm not sure how well I described that, but... :p

DAMN you got to the point before me,:flipoff2: but I think I may have described it better(or at least in more detail):p

Not too many vipers that I have seen run on 38" swampers.