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To add to the below comments, if your measurements are
correct, then the ratios are about right for 75km@4k
rpm for 4th gear in 4-low.  I 2nd the thought that the
cause may be your transfer box stuck in 4-low.  

Look at the front of the transfer box while someone is
shifting from 2high to 4high to 4low to 2high.  You
should be able to see the rods moving back and forth
as the gears engage/disengage.

George Sollish had/has a similar problem of it not
shifting out of 4low once shifted into it.  George,
what did you do to fix it?

Martin


 --- Diana Alan <dianaa@xxxxxxxx.xxx.xx> wrote: 
> Hennie
> 
> The only ratio changes in the gearbox relate to the
> lower gears and occur about the time of the
> introduction of the 2 litre motor in the 80".  The
> top gear is 1:1 direct drive to the transfer box.  I
> believe the Transfer boxes are the all same at
> 1.148:1 giving a final drive at 5.396:1.  see:
> http://users.mrbean.net.au/~rover/gearbox,.htm
> 
> Revs and speed are in a direct relationship.  Even
> if someone fitted 4.88:1 1949 80" diffs, it would
> only make a final drive  5.603:1 which shouldn't
> make as much difference as your reporting.  
> 
> The most likely problems are:
>   a.. Your clutch is slipping? (do you smell burning
> while driving or when you release the clutch, the
> engine revs up, then slows down as the car moves
> off, a bit like a boat.)
>   b.. Your transfer box is stuck in low ratio?
> (I assume you don't have something weird fitted,
> like a rubber band installed between the crankshaft
> and diff or a torque converter instead of a clutch.)
> 
> My other questions are: (and there not meant to be
> offensive)
>   a.. How are you measuring the Revs?
>   1.. If your using an impulse tachometer is it
> calibrated to a 4 cylinder and not something silly
> like 2 or 3 cylinders.  
>   2.. If you are using one with an alternator pick
> up, is it calibrated to the pulley sizes on the
> engine.
>   3.. If you are using one with a magnetic or
> optical pick-up is it working correctly
>   a.. How are you measuring the speed?  
>   1.. Have you checked it by measured distance over
> measured time? 
>   2.. There isn't some sort of reduction device in
> the speedo drive that's malfunctioning?
>   3.. Try using a GPS device to check your speedo.
> Sorry I can't be of more help.
> 
> Diana
> 
> 
> ----- Original Message ----- 
> From: "Hennie Potgieter" <hpotgieter@xxx.xx.xx>
> To: <series1@xxxxxxxxx.xxx>
> Sent: Wednesday, November 10, 2004 10:20 PM
> Subject: RE: SER1 Differential woes.....
> 
> 
> Hi all,
> 
> Thanks for all the really usefull replies to my
> original question.  But
> all of this does not solve my underlying problem. 
> My problem is that my
> 107" SW (with 2.25 petrol engine) only reach a speed
> of 75km/h at 4000
> rpm on open tarmac.  
> 
> Someone mentioned to me that not all S1's had the
> same gearbox ratios
> and that might explain the lack of speed for my van.
>  Can anyone perhaps
> shed some light.......?
> 
> Hennie
> 
>  



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