Mark90 Posted March 1, 2006 Share Posted March 1, 2006 Anyone know what the ratio of a GKN overdrive is? Also I know that Ashcrofts underdrive is 2.69 ratio but what ratio are the gears in their low ratio transferbox? Can't seem to find the figures anywhere? Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted March 1, 2006 Share Posted March 1, 2006 http://www.ashcroft-transmissions.co.uk/contact.html The info isn't there anynore! Quote Link to comment Share on other sites More sharing options...
Mark90 Posted March 1, 2006 Author Share Posted March 1, 2006 I know, thought maybe those who had one (Nick, Rob???) might know. Quote Link to comment Share on other sites More sharing options...
white90 Posted March 1, 2006 Share Posted March 1, 2006 JST/Will Warne sent me spread sheets with all the details I can post them onto you later if that helps. (on a different PC to this one) Quote Link to comment Share on other sites More sharing options...
Mark90 Posted March 1, 2006 Author Share Posted March 1, 2006 That would be great thanks Tony defender at blueyonder dot co dot uk Quote Link to comment Share on other sites More sharing options...
darthdicky Posted March 1, 2006 Share Posted March 1, 2006 I seem to remember the low ratio gears being an 80% reduction, bringing low down to about 5.95:1 ish? Overdrives seem to bring revs down from 3000 to 2300 at 70mph, which implies a 30% reduction if my maths is vaguely correct? Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted March 1, 2006 Share Posted March 1, 2006 ... or about twice the 'overdrive' of going from 1.4 to 1.2 t-box. Quote Link to comment Share on other sites More sharing options...
Mark90 Posted March 1, 2006 Author Share Posted March 1, 2006 Tried that but excel didn't understand "about twice the 'overdrive' of going from 1.4 to 1.2 t-box" Quote Link to comment Share on other sites More sharing options...
western Posted March 1, 2006 Share Posted March 1, 2006 Worth a read http://forums.lr4x4.com/index.php?showtopic=2785 Quote Link to comment Share on other sites More sharing options...
Mark90 Posted March 1, 2006 Author Share Posted March 1, 2006 Thanks Ralph. But still no mention of the actual overdrive ratio, is it a big secret? Quote Link to comment Share on other sites More sharing options...
western Posted March 1, 2006 Share Posted March 1, 2006 Don't think so, But there's no mention of the ratio in my GKN O/D's owners booklet/fitting instructions. just found this but no mention of ratio at all http://www.gknservice.co.uk/gkn-ids-uk/res...L_Landrover.pdf at the bottom is a e.mail address, I've spoken to the named guy when my solenoid & speed sensor was playing up, he was most helpful & should know the answer to your question, I haven't found anything about the ratio used. Quote Link to comment Share on other sites More sharing options...
Mark90 Posted March 1, 2006 Author Share Posted March 1, 2006 I have tried google and no mention of it any where I can find. Not essential but would have been a nice to have for a little something I've been playing around with Quote Link to comment Share on other sites More sharing options...
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