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Discussion Starter · #1 ·
Hi all looking buy a 65 fastback GT but the owners have changed the diff to a 4.11/1 posi-traction. I would like to change it to 3.25.1 ( is that a good option for the street ) so would I need to change the posi-traction or just change ring and pinion gears in the diff head????

Also it has a 4 speed gearbox (orignal) and Hurst shifter, so would that be a top loader from the factory is that what they came out with????

Regards
Coombes.
 

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Yes and yes. 3.25 would be a good choice. It won't have the hole shot of a 4.11 but will have alot better mileage. Yes the toploader is the original type of trans. Excellent 4-speed. None better.
 
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