RCampbell Posted April 7 Share Posted April 7 (edited) I have just unearthed a Type D Diff in the garage that I am about to put on ebay, it is FR stamped so I know that it is a Type D but im unsire of the ratio, I think it might be a 3.89 but wondered if someone out there could clarify? Ideally I dont want to open it and count teeth! (It will depend on whether I had it for the non overdrive MKIII GT6 or the Overdrive 2l Vitesse) Edited April 7 by RCampbell Typo Quote Link to comment Share on other sites More sharing options...
Clive Posted April 7 Share Posted April 7 FR should be 3.63, spitfire 1500. Often regarded a very good choice foir 2 litre cars. The only way to tell for sure is to mark the input flange. turn BOTH 1/4 shafts exactly 1 rotation, and count how many rotations the input makes. if a smidge under 4, it is 3.89, a bit over 3 1/2 is 3.63. 1 Quote Link to comment Share on other sites More sharing options...
RCampbell Posted April 7 Author Share Posted April 7 3 hours ago, Clive said: Thanks for the very useful information Clive. 1 Quote Link to comment Share on other sites More sharing options...
yorkshire_spam Posted April 8 Share Posted April 8 19 hours ago, Clive said: The only way to tell for sure is to mark the input flange. turn BOTH 1/4 shafts exactly 1 rotation, and count how many rotations the input makes. if a smidge under 4, it is 3.89, a bit over 3 1/2 is 3.63. I've never been massively confident trying this method myself, I struggle to discern the difference between 3.89 / 3.63. I guess if I was more careful about it I could tell by whether the flange is in the "half-past to quarter to" or "quarter-to to on the hour" quadrant when it stops. Out of frustration I've ended up opening the diff up and counting the crown-wheel and the pinion teeth and doing the division. 1 Quote Link to comment Share on other sites More sharing options...
Kevin R Posted April 8 Share Posted April 8 I have never done this myself before so at risk of sounding totally stupid this is only a SUGGESTION.. Turn the 1/4 shafts 10 rotations which would amplify the output to approx 39 / 36 which would be easier to see the difference. Would need the help an assistant. 🤔 Would it work ? 1 Quote Link to comment Share on other sites More sharing options...
Dannyb Posted April 8 Share Posted April 8 Sounds good to me. Danny 1 Quote Link to comment Share on other sites More sharing options...
Clive Posted April 8 Share Posted April 8 58 minutes ago, Kevin R said: I have never done this myself before so at risk of sounding totally stupid this is only a SUGGESTION.. Turn the 1/4 shafts 10 rotations which would amplify the output to approx 39 / 36 which would be easier to see the difference. Would need the help an assistant. 🤔 Would it work ? Yes, that would work. Deffo need an assistant, counting 2 different things would get mighty tricky by yourself. 1 Quote Link to comment Share on other sites More sharing options...
JohnD Posted April 9 Share Posted April 9 21 hours ago, Kevin R said: I have never done this myself before so at risk of sounding totally stupid this is only a SUGGESTION.. Turn the 1/4 shafts 10 rotations which would amplify the output to approx 39 / 36 which would be easier to see the difference. Would need the help an assistant. 🤔 Would it work ? Confuses me! If you're turning the quarter shafts, then you must be counting the turns on the INPUT flange, that bolts to the prop shaft? John Quote Link to comment Share on other sites More sharing options...
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