auyt Posted May 18, 2018 Share Posted May 18, 2018 Hi all, I appreciate this question has probably been asked many times however bear with me , I was considering fitting a T9 box to get a fifth gear. However the chassis is set for an Escort box and the bulk of the cast iron case and the 5th gear extension housing interferes with the chassis mounts.Has any one successfully done this or should I just s tick with the 4 speed.many thanks in advance. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted May 18, 2018 Share Posted May 18, 2018 Pretty sure there's something in the archives on this, many have done it so it can certainly be done. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 18, 2018 Member Share Posted May 18, 2018 Three threads with details of the work: 1, 2, 3.And the full search.(I'd keep the box and optimise the ratios, including the final drive.)Jonathan Link to comment Share on other sites More sharing options...
Duckpit Posted May 18, 2018 Share Posted May 18, 2018 Yes its possible & I have done it. However the four speed box is far nicer and I think more reliable and I do regret it sometimes.I bought a fabrication which moved the gear box mounting bracket backwards from (I think ) Brent Chiswick and proceeds went to nuke the luke, who you should be able to blat mail.You cut out the old mounting & rivet in the fabrication & its fairly easy. A word of warning, the standard type 9 ratios leave a lot of room for improvement for a 7 Link to comment Share on other sites More sharing options...
Stridey Posted May 18, 2018 Share Posted May 18, 2018 Deffo been done. I picked up a now refurbed 4 Speed off a chap who was fitting a five. He showed me where the chsssis had been modded and talked about the tunnel?i can reccomend BGH Gearttech for any type 9 issues, gearbox gurus.http://www.bghgeartech.co.ukthey refurbed my four speed. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted May 18, 2018 Share Posted May 18, 2018 The BGH ratios are still wide of the mark for a Caterham, Speak to Steve here for a top spec gearkit https://www.tracsport.com/gearkits Link to comment Share on other sites More sharing options...
auyt Posted May 18, 2018 Author Share Posted May 18, 2018 Thank you all for the links and the good suggestions, and after reading all the info, I'll leave the gearbox that's in the car as it is for now.Physically the T9 wont fit, unless I remove the complete saddle from the existing mount. The T9 mount needs to effectively be at the floor skin and hence the redesign by Caterham of the chassis in that area. Link to comment Share on other sites More sharing options...
Wrightpayne Posted May 19, 2018 Share Posted May 19, 2018 Does that mean you have a spare 5 speed now? Mate is looking for one for his herald project!Ian Link to comment Share on other sites More sharing options...
auyt Posted May 19, 2018 Author Share Posted May 19, 2018 Yes However is he in Australia? Link to comment Share on other sites More sharing options...
Wrightpayne Posted May 19, 2018 Share Posted May 19, 2018 Hmmm - postage might be prohibitive! Link to comment Share on other sites More sharing options...
auyt Posted May 19, 2018 Author Share Posted May 19, 2018 Added to the cost, as Sierra’s we’re not sold in Australia, so a second box Not overhauled will set you back an average of 550UKP plus... Link to comment Share on other sites More sharing options...
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