djn

I think "Vitesse Engineering" are currently developing an MX5 gearbox conversion for the GT6, which would also suit the Vitesse. I am thinking of going down that road if it comes off. https://www.vitesse-ltd.com/ (Spitfire 2.5 efi with 3.63 diff)

Found this on the web recently. https://www.triumphexp.com/forum/spitfire-and-gt6-forum.8/j-type-od-for-spitfire-vs-gt6.1332997.1854586/page-3#msg-1854586 First post on page 3.

Hi, It might have already been suggested but try disconnecting the electrical side of things to see if the issue stops?

Thanks for all the advice. I will have a go at getting a refund.

Hi, I enclose my correspondence with Bastuck Dear Sir,Thank you for the message. We are not aware of any problem with the shafts so far. When mounting the shaft, always check the clearances. If this had been done correctly, the problem would have been detected immediately and no damage would have occurred. Of course, you could have returned the shaft or adjusted the Bush accordingly. Perhaps the problem was not with the shaft but with the installed bush.Please accept our apologies. Unfortunately, we cannot help you.Kind regardsTeam BastuckAndré KronbergNachrichtentext:Hi, I bought one of your type D overdrive gearbox mainshafts for my Vitesse gearbox. The 2nd gear bush & cog seized onto the shaft. Measured your shaft and it is slightly over the recommended max diameter (22.215mm). Max should be 22.194mm. Gearbox badly damaged. Can you help. Advised to contact you by TSSC member.

Hi, Thanks for the various responses. I sourced a spare non-overdrive gearbox from triumphspitfirespares which seems to be in very good condition. I used the internals and built them round another OD mainshaft which has slight wear on the tip. I am hoping a good machine shop can salvage the bastuck shaft by grinding it to the correct tolerances and hopefully rebuild the box over the winter with the salvaged or another replacement od mainshaft. Any recommendations of a source for a good mainshaft would be helpful. Thanks

Bastuck replied and said I should have checked the dimensions. No further assistance offered. Older and wiser now!

Thanks. Sent an email to Bastuck. Will let you know what I hear from them.

Hi Johhy. Original shaft measures 22.175mm, Bastuck shaft 22.215mm.Thanks for the info. Waiting on a replacement gearbox to see what parts I can use for rebuilding. Will let you know how I get on.

Will check when I get a chance. A cheap micrometer but good enough to check there is a difference between the old & new shafts.

Hi, Has anyone had any issues with Bastuck mainshafts for type d OD vitesse/gt6 gearboxes. My second gear cog & bush seized solid to the shaft and stripped the teeth off the layshaft cluster. Measured the Bastuck shaft and it is about 0.03mm thicker than the original. The bushes were a bit stiff to push on to the shaft when I fitted them but I assumed the original was worn and that they were meant to be a tight fit?

Thanks for the reply Nick. Will let you know how I get on once I get the wide band fitted and the roads get cleaned of salt. DJN

Hi Keith, I think my cam is a standard early TR6 pi cam. Will be fitting a wide band O2 sensor soon and will have another go at set up. No rolling roads anywhere near me but planning a trip to one up in Wick later in the spring to hopefully smooth things out. DJN

Hi Nick, A wide band O2 is on my shopping list so I will have a play around with things once it is fitted. Bonnet clearance is tight but it shuts and so far so good. My throttle body is a 46mm. Thanks for the reply and I will update my progress after I get to the bottom of my noisy back axle area. DJN

Hi Roger, Yes, it came with the kit from "Trigger Wheels".