Re: Re: SER1 Measuring diff ratio

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G'Day Hennie

The "experts" will jump on my head if I'm wrong - however I believe Wayne is correct 
as long as both road wheels are rotated at the same time. ie sitting on the ground with 
equal traction.  

If you jack one wheel off the ground while the other side wheel is still on the ground 
then the "differential" planetary gears come into effect and the the ratio is halved i.e. 
2.35:1 

The other issues to look fo are the exchange of early Land Rover diffs which will give 
you a ratio of 4.88:1 or Rover Car Diffs either 4.3:1 or 3.9:1 or Range Rover Diffs 
3.54:1.  If you have the Rover Car or Range Rover diffs you will notice an apparent 
reduction in torque but an increase in speed and your speedometer will probably be 
reading slow.

Cheers
Diana

> Wayne Perrin <wperrin@xxxxxxx.xxx> wrote:
> 
> Hi Hennie,
> The "academic" method is to count the teeth on the differential gears 
> and create a ratio of the smaller to the larger.  The usual method is 
> to jack up the wheel. Mark a place on the drive shaft or U-joint.  Spin 
> 
> the road wheel one revolution and see how many turns the drive shaft 
> makes.  If it is a  4:7 ratio,  the drive shaft will turn a little over 
> 
> 4 1/2 times.
> Wayne Perrin
> On Thursday, February 24, 2005, at 03:34 AM, Hennie Potgieter wrote:
> 
> > Hi all,
> >  
> > Please excuse my stupidity, but can someone please confirm for me the 
> 
> > process of measuring the diff ratio on my 107" SW.  According to my 
> > knowledge it should be 4.7:1 but I dont even get close to this.
> >  
> > Kind Regards,
> >    Hennie

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