Its only a matter of time before a tooth will break/chip off of the diff gears,lock the diff gear and cause the diff to 'exit' via the side off the gearcase.Drag racing an MTX75 with the stoc diff is plain stupid...I rebuild transmissions daily and have welded up many 'air conditioned' gear cases...if you want to play I'd advise you pay,for a Quaife at least,Vs an expensive repair and a quaife...!I had many examples of diff/gear failure at the Spring Zing...'be scared..be very scared!!!!

V6 MTX
'Don't p**s up my back then tell me it's raining!!!"
'Its only nuts & bolts!'
'If I build it,fix it,upgrade it or modify it...MAYBE they will come....!
Haines Motor Sports Inc,
Dealer for 'Quaife America' & 'Autotech Sport Tuning'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
Get a Turbo for you Zetec from HMS Inc...by 'The Demon' ...www.DemonDynamics.co.uk
..don't talk about it DO IT !!!