Section : General

General 2000/2500/2.5 messages

Please Help Triumph 2000 Diff

Posted By : Kevin Smith, 26-Jul-2007, 12:27pm

Hi can anyone tell me if a diff (complete axel) off a 2500s will fit onto my 2000 mk2 as my diff is whining more than the missus at the moment and a 2500s is the only replacement resonably priced i can find at the moment.

Followups :

Please Help Triumph 2000 Diff

Posted By : Mark Hammond, 26-Jul-2007, 01:44pm

It should physically fit, but the ratios may be different. If this is the case you will need to change the speedometer to the same as the car that the diff was intended for or at least get your speedo recalibrated.

Mark
- Please Help Triumph 2000 Diff
  
  Posted By : Clive Speaks, 26-Jul-2007, 07:23pm
  
  I would think long and hard before fitting a diff from a 2.5S.
  
  This would give you a final drive ratio of 3.45:1 as against 3.7:1 for a 2000 diff. A standard Triumph 2000 would have trouble pulling itself along with that high a ratio. For that matter, a standard tune 2.5S has trouble pulling itself along on that ratio. I should know, it was one of the main reasons I worked on the engine of my old 2.5S.
  
  2.5 S Manual with overdrive: 26mph/1000rpm in 4th overdrive
  
  2000 Manual with overdrive: 23.8mph/1000rpm in 4th overdrive
  
  The net result would be you spending a lot of time in 3rd overdrive rather than 4th.
  - Please Help Triumph 2000 Diff
    
    Posted By : Mark Hammond, 26-Jul-2007, 07:28pm
    
    Clive, isn't O/D 3rd more or less the same ratio as 4th?
    
    Mark
    - Please Help Triumph 2000 Diff
      
      Posted By : Clive Speaks, 26-Jul-2007, 07:34pm
      
      Mark, on a 2000, overdrive 3rd is 3.99:1
      direct 4th is 3.70:1
      
      or in other words at the red line 5800 rpm, 51 mph and 77 mph respectively.
      - Please Help Triumph 2000 Diff
        
        Posted By : Mark Hammond, 26-Jul-2007, 08:13pm
        
        So a "true" 6 speed 'box then?
        
        M.