Identify Rear Axle Gear Ratio - Page 2 - Ford Mustang Forum
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I've thought about selling the 3.73 ring & pinion but new they're only around $160 or so. I wouldn't make enough on my used set to make them worth selling.
Sent you a PM couple of days ago

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Was 3.27 a factory option? Seems like it was but maybe I just dreamed that.
I wonder what was the majority produced? I’m thinking probably 2.73. The fox I had had an aod and 2.73. It seems like if one made a boat load of power the 2.73 wouldn’t be all that bad with a T5. 70 mph in second for Pete’s sake, ha. I think you’d probably have to get a custom cam to work well with the gearing though. Mine was a bucking bronco at low speed/low rpm with 2.73 and mild cam.
I had an '89 LX that came with 3:08 stock, I went up to 3:27 in that car, also opened up the air way and would peg the 140 speedo on the highway. Guy's on motorcycles were surprised that I could keep up with them on the highway



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Sent you a PM couple of days ago
I sent you an email


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Originally Posted by 90lxwhite View Post
Was 3.27 a factory option? Seems like it was but maybe I just dreamed that.
I wonder what was the majority produced? I’m thinking probably 2.73. The fox I had had an aod and 2.73. It seems like if one made a boat load of power the 2.73 wouldn’t be all that bad with a T5. 70 mph in second for Pete’s sake, ha. I think you’d probably have to get a custom cam to work well with the gearing though. Mine was a bucking bronco at low speed/low rpm with 2.73 and mild cam.
Yes you were right.The 82-85 auto had the 3:08.The 87-93 had the 3:27.The 3:27 wouldn't be bad in a manual either.Getting a differential out of a wrecked aod 87-93 would be the ticket for a manual with a supercharger/turbo.
Did all AOD’s 3.27? I always thought mine had 2.73.
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Originally Posted by my89foxbody View Post
Quote:
Originally Posted by 90lxwhite View Post
Was 3.27 a factory option? Seems like it was but maybe I just dreamed that.
I wonder what was the majority produced? I’m thinking probably 2.73. The fox I had had an aod and 2.73. It seems like if one made a boat load of power the 2.73 wouldn’t be all that bad with a T5. 70 mph in second for Pete’s sake, ha. I think you’d probably have to get a custom cam to work well with the gearing though. Mine was a bucking bronco at low speed/low rpm with 2.73 and mild cam.
I had an '89 LX that came with 3:08 stock, I went up to 3:27 in that car, also opened up the air way and would peg the 140 speedo on the highway. Guy's on motorcycles were surprised that I could keep up with them on the highway
When my ‘95 was stock and new (2.73) top speed was 130 mph in 4th down a steep hill. It wouldn’t do 130 in 5th.
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It appears 87-93 was:
2:73= standard gear for aod and t5
3:08= optional gear for t5
3:27= optional gear for aod
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Originally Posted by wbrockstar View Post
It appears 87-93 was:
2:73= standard gear for aod and t5
3:08= optional gear for t5
3:27= optional gear for aod
Ah ok. I'm pretty sure my '90 had 2.73's. It cruised at a lower rpm than my '95 with 3.31.
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