Now how about a comparison/inclusion of the corporate 9.25? I've been
looking for info like axle shaft thickness differences between late-model
9.25 variations. For example, I have 2 extra 9.25 rears in my garage - 1 is
a 3.55 peg leg from a '99 ram truck and 1 is a 3.92 peg leg from a '98
3/4-ton ram van. The 2 are identical externally except for the spring and
shock mounts and more importantly the axle shaft tubes which start out the
same diameter at the pig but neck down much smaller at the wheel end on the
ram rear and they are not on the van rear. Van rear is same tube diameter
all the way from the pig carrier to the brake mounting brackets at the end
and is about 7 inches shorter brake mounting pad to pad. This means that
the axles and the bearings are much larger. The axles being over 3 inches
shorter ea. probably even makes them stronger.
Most everything I've found covers older models only.
Also - ever noticed how similiar the 9.25 and Dana rears are? They even
look almost the same.
Thoughts?
Latr,
Shane
"Kenneth M. Berntsen" wrote:
> Thankyou professor Kuzia :)
>
> -----Original Message-----
> From: Mark Kuzia [mailto:flyboy01@mediaone.net]
> Sent: Friday, July 27, 2001 11:20 PM
> To: dakota-truck@buffnet.net
> Subject: DML: Re: Correction to: Bolt in Dana 60 rear with Disk brakes
> for Daks
>
> >From: "Kyle Kozubal"
> > A 'stock' Dana 60 has a 9.75" ring gear. The axle splines will vary
> from
> 30
> > splines to 35 splines. A typical 30 splined Dana 60 can handle 6,200
> pounds
> > while a 35 splined Dana 60 can handle 9,600 pounds. Normal 30 splined
> Dana
> > 60s have axle shafts which are 1 5/16 thick, while the HD 35 splined
> Dana
> > 60s have a 1 1/2" axle shaft. They currently use Dana 60s on trucks
> with a
> > gross weight rating over 16,000 pounds. Dakota are what.....like
> 4000-4500
> > pounds?
>
> Actually a small correction here..........................
>
> Class is in session.
>
> When an axle is rated in pounds, it does not mean the weight of the
> vehicle,
> it means torque multiplication.
>
> For example:
>
> Let say you have a Dakota with a 408 that puts out 500 lbft of torque at
> 4000 rpm's, you are running a 5-speed, and have a 30 spline Dana 60 with
> a
> 4.11 gear in it.
>
> Multiply Torque (500), by first gear ratio (3.35), and then by rear gear
> ratio (4.11).
>
> 500 x 3.35 x 4.11 = 6884.25
>
> That is 6884.25 lbft of torque to the axle. The 30 spline axle is rated
> at
> 6200 lbs, this is clearly not strong enough to withstand the torque, you
> would need a 35 spline in that case. This is an extreme case but
> feasable
> with pefect taction, or Matt. This is why many 8 1/4's break under
> 5-speeds
> and work fine under automatics. An auto will pre load the axles and
> gently
> launch, where a 5-speed will shock the axles and cause them to snap.
>
> Mark Kuzia
> flyboy01@mediaone.net
> http://people.mw.mediaone.net/flyboy01/home.html
> 1995 Dakota 13.79 @ 102.45 mph
> ~360ci, 5-spd, 8 3/4 rear / 3.90-SG
> 1994 Dakota 15.36 @ 91.56 mph
> ~318ci, 5-spd, 3.90 LS (bone stock, no mods)
-- '96 IndyRam-HisIndy-MPI TB Pulleys RTcam MPComp HVoilpump DynaGearDoubleRoller WindageTray CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 EFI R&D vehicle '93 Dakota CC 318 - soon to be mine 8)
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