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"A" type overdrive mainshaft


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I am currently gathering and sorting parts for the restoration of my early TR4. I have found two "A" type OD units in my parts storage. However, I do not have a gearbox mainshaft for the units. My son, who lives several hundred miles away from me, says he may have the mainshaft or may be able to locate one from his sources. I can't seem to find a good drawing or photo of the mainshaft to send to him. I know how to tell the difference between a non-OD and an OD mainshaft, but how does one tell the difference between the TR3 and TR4 mainshaft? Does anyone have a good photo of the OD mainshaft for a TR3 and a TR4? Photos would be preferred, but a good description of the identifying difference(s) between the two would also be appreciated.

 

thank you,

gary

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