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Old 02-19-2008, 02:53 PM
70 Chevelle SS 396
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Best route for transmission swap

I've been looking into a 5 speed swap for my '79 Triumph Spitfire. There are overdrive units, and 5 speed conversion kits; But, the overdrive units are either pricey or hard to come by. I'm trying to "engineer" my own conversion rather than spend the big money on a pre-made kit (what's the fun in that, anyways? )

I think it would be best to use the Spitfire bell housing and machine an adapter to fit it to the gearbox of choice. My dilemma is how to mate the clutch and trans.
So, my question is: Would I be better off-

A. Trying to find a transmission with the same type input shaft to fit the Spitfire clutch (0.875 x 20 spline, but I've only found FWD transmissions with the same clutch spline size)

B. Mating a clutch from the donor trans to the Spitfire flywheel (which would clear the bell housing)

or C. Mating the spitfire clutch to the donor trans, by means of some kind of splined adapter, or by grafting the Spitfire input shaft to the input shaft of the donor gearbox?

I hope I made some kind of sense. Any suggestions?


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Old 02-19-2008, 09:25 PM
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Hi, I don't know if it will fit, not much on the british cars, but my friend has a good 5 speed out of a Triumph TR-7, I put a Ford 302 and automatic in the car for him, but he only wants 500.00 for it if it will work, might be an easy way put. Keith
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Old 02-21-2008, 05:35 PM
70 Chevelle SS 396
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Anyone know about the TR7 5 speed transmissions?

Maybe a complete engine and 5 speed setup from a TR7 would be a fairly simple swap into the Spit. Would probably require no more special work than fitting an odd gearbox to the Spitfire engine. The TR7 engine is a little bigger (but not too much- maybe 4-500 cc's).

Any Triumph people out there?

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