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General TR Overdrive transmission serial number

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Testing out a couple of overdrives today. One of the transmissions had a serial number of GR27035/7. What is it out of? It looks just like a trans from TR250 or early TR6.
Marv
 

titanic

Jedi Warrior
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Marv-The GR prefix and 7 suffix means a factory rebuild, according to Derek Graham.
Berry
 
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