SOURCE: 1972 Triumph Spitfire 4 Transmission lubrication for 4 speed standard with overdrive
I have a 1973 Triumph GT6 The Gearbox is the same except it has different ratios. The best oil I have found to use is Castrol Multitrax 80/140 with 10% moreys additive.(no additive with overdrive)
SOURCE: 1972 Triumph Spitfire, 3rd gear grinding
Jumping out of third was a common problem with the Spitfire quick changing up from forth gear would beat the syncro and chip the teeth on the drive dog then the bits would stop the syncro from engaging fully and it would jump out. If you replaced the syncro and the drive hub it may just be a bit stiff, the selector also wore quite quickly and misaligned the drive hub causing it to be hard to select.
I will scratch about in my very old manuals and see if I can find the spitfire gearbox manual, If I can I will post it.
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