2.9X posi IRS pumpking donor/halfshaft q?

[Jim Davies]

On Fri, 28 May 1999, Gary Derian wrote:

> Those old Datsuns used regular U-joints and ball splines to accommodate the
> length change.  All front wheel drive and independent rear suspension rear
> wheel drive cars use halfshafts that accommodate length change.  Its done in
> the joint itself.  Typically, the outer joint is a CV type (Rzeppa) which
> can handle high angles but no length variance, and the inner joint is a
> tripode or similar that can handle only a small angle change but also some
> length change.  These types of joints would require different flanges on
> your hubs.
> 

Splines tend to lock up under the high torques that half shafts can see.
This effectively locks the suspension, although the effect of this varies
depending on the design of the suspension and the amount of torque. A
plunge joint is less likely to do this. Thats why the old Mopar Ball&
Trunnion joint was used as an inner joint on half-shafts for Indy, etc. A
tripod would be better, of course [assuming it has sufficient strength]


> > other) might have feasible donor diff's for this swap as well??  Basically
> > he's looking for an ~8.25" or larger ring gear posi pumpkin w/ low ratios
> > (~3 or even less).  He said the viper ratio is 3.07, no ideer if other
> > ratios were available?  Dana 60 'vette units only go down to 3.07 and he's
> > at 3.15 know so that's not much gain for him but he's still interested in
> > that step if it's all that's available.
> >
The Viper uses a 44 Dana\Spicer center section. Older Jags used a similar
44 center section in their IRS vehicles. Corvette never used any Dana 60s. 
You can swap in most other 44 R&Ps in any of the above 44s. If you use a
3.73 or lower [3.9, 4.09, 4.56 etc] you will have to change the carrier.