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TR4/4A Which rear end ratio?

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Rut

Rut

Obi Wan
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Good morning all. I'm starting to work on the drivetrain for the 67 TR4a and I have several rear ends to choose from...3 TR4as and 2 TR6s. I think they are all non OD cars originally and they are 66 & 67 TR4a, 72 & 73 TR6. I also have an OD transmission from a 62 TR4 that I plan on using for this project. Is there a 'best' combination to use? The condition of all these parts is unknown, but they all turn freely without noise and don't appear to leak.
Thanks, Rut
 
It's likely they are all 3.70 ratio. I assume the 4A's are from IRS cars since the TR6 are. I'd remove the back covers and inspect the gears, maybe count the teeth on the crown wheel and see if they are all the same ( I think they will be ) and if they are that would confirm 3.70.
 
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