Jonnylandagent Posted January 30, 2020 Share Posted January 30, 2020 Just putting a 1.2 Transfer box from a Disco into my Defender 200tdi running on standard wheels and tyres. I have removed the 23 tooth red speedo drive to replace it with one to fit the thicker Defender speedo cable. So, should I replace it with another red one or the same one as the original box which I believe is a 20 tooth blue one but can;t get out to check? Also some suppliers list different version with extra letters such as FRC3313C8 - what does the C8 mean? Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted January 30, 2020 Share Posted January 30, 2020 What size tyres do you have Jonny ? It all depends on that. Post up your tyre size and we can give you a definitive answer. HTH Mo Quote Link to comment Share on other sites More sharing options...
Jonnylandagent Posted January 30, 2020 Author Share Posted January 30, 2020 Sorry I can't check as it is some miles away. I believe the radial equivalent of 750s. 5J rim I am pretty sure about - they are Michelin military off-road tyres. Quote Link to comment Share on other sites More sharing options...
Jonnylandagent Posted January 30, 2020 Author Share Posted January 30, 2020 Having looked at a photo I would say that is right - 750 x 16 and I think these would have an aspect ratio of 85%. Very happy to accept advice based on these numbers. Quote Link to comment Share on other sites More sharing options...
western Posted January 30, 2020 Share Posted January 30, 2020 You need the blue 20 tooth FRC3310 drive gear for that size tyre,this drive gear also works with 235/85 & 255/85 tyres, I've run all 3 sizes on my 110 in the last 25 years. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted January 31, 2020 Share Posted January 31, 2020 Indeed, I run a blue gear too with 235s. HTH Mo Quote Link to comment Share on other sites More sharing options...
Jonnylandagent Posted January 31, 2020 Author Share Posted January 31, 2020 Thanks for your help - job sorted. 1 Quote Link to comment Share on other sites More sharing options...
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