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I have a friend that has a ford 9 inch complete rearend out of a 69 mustang he thinks it has 3.36 posi in it and asked me if i wanted it for 200.00. Im thinks about it for my 55 chevy will this thing fit or would i have to do major changes the wheels are not a problem there welds draglites.
 

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I don't know the exact width of a 69 Mustang 9" axle, but it has to be very close to the same as a 55-57.

$200 is a charity price, especially if it has limited slip, even if worn. I don't think you can go wrong, even if the internals are trash.
 

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When I was much younger & stupid I put a 69 Mach 1 piece of junk 9 inch under a 67 Camaro. I did not even change the perchs for the swap, They are the same width as early Camaro or 55-57. They are worth pennys on the dollar compared to a 12 bolt. I have had a 4.88 Mustang tractiuon lock for sale for years.

FYI I dont think the seller really knows what he has 69 Mustang ratios are 2.75, 3.00 3.25 & 3.50 etc. I have scrapped several 100 Ford 9 inches and never seen 3.36 gears.
 

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"never seen 3.36 gears"

And you never will. Though the circle track guys do have a lot of ratios that Ford never built. They can be had in very fine increments.
 

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Here's a list I found with a quick Google:

RacersGuide.com
"If you need something for your stock car, you'll find it here!"
Ford 9 Inch Gear Ratios
Ratio Teeth
2.8 42-15
2.86 40-14
2.91 32-11
2.94 47-16
3.00 39-13
3.07 43-14
3.25 39-12
3.33 40-12
3.45 38-11
3.5 35-10
3.55 39-11
3.6 36-10
3.7 37-10
3.75 45-12
3.82 42-11
3.89 35-9
4.00 36-9
4.11 37-9
4.22 38-9
4.33 39-9
4.44 40-9
4.5 36-8
4.56 41-9
4.63 37-8
4.71 33-7
4.86 34-7
5.00 35-7
5.14 36-7
5.29 37-7
5.43 38-7
5.50 33-6
5.67 34-6
5.83 35-6
6.00 36-6
6.20 31-5
6.33 38-6
6.50 39-6


That's not a complete list, I have a 3.91 gearset myself, that was Ford built, has the oval logo on it. 3.0, 3.25, and 3.50 are the common factory ratios in the low 3's.
 
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