It is torque that kills gearboxes.  Most performance tuning reduces torque 
(eg anything that involves a different cam) so is not generally an issue.  
BUT, a lot rpm in first gear is hard on the Spridget boxes.  A turbo (or 
nitrous) is a sure fire way to dramatically shorten the life of the box.
The engine in my car put 100+bhp through a standard ribcase box for years 
including a lot of 7,000rpm (did I mention this was a road car) and never 
gave any trouble.  The car has a 5 speed now.
Paul is the gearbox expert so what does he say?
Daniel1312
In a message dated 26/08/00 03:33:28 GMT Daylight Time, 
bmantz@roanoke.infi.net writes:
<< At what point, other than
 catastrophic failure, do I know that I have reached the limit of the
 tranny?  >>
 
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