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Hi
I need some help. I need to rebuid a trans for my 66 GT fastback. I have the wide ratio one that came in it and I have a close ratio out of a 69 mustang. Which one would be the better one to use? I am running stock 3.00 rear gears and the engine is approx 250 HP 289 V8. Any help in this matter would be appr.
Thanks Al
 

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Unless you are road racing, stick with the wide ratio. It is better-suited to street driving, IMO.

If you want a little more zip, try going to 3.25 or 3.50 rear gears.
 
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