On the classified page BB made a comment about the S codes all having wide ratio box's.
Yet my books and David Kee's site show both close and wide for S codes of the 67 year.
How was it determined what ratio was installed in a given S code car?

I had a S code 67 with orig close ratio Gord

Most of the s code's came with wide ratio but some came with the close ratio. I had a 1996 fairlane GT that had the wide ratio. What was funny at the time most everone thought the close ratio was better. I installed a 4.11 and with the wide ratio first gear (not sure if it was 2.74 or 2.78 but anyways it was a bear out of the hole although it suffered a little on the top speed the et's were great at the time.

Code "5" is wide ratio "6" is close ratio.


53 F100, Volare clip, 4 wheel disc 390-wide ratio toploader

Basically it depends on the cars rear axle ratio. I don`t know for sure about the 390`s, but on the 70 Mustangs with 351C`s, if you had 3.25 or taller gearing you got the 2.78 low gear wide radio, if you had 3.50 or lower, you were stuck with a 2.32 close ratio.

428 powered Fairmont drag car, Best ET:10.03@132.11MPH, best 60 ft: 1.29
59 Meteor 2 dr. sedan 332, Ford O Matic
74 F350 ramp truck 390 4speed

I had a 67 Rancharo GT with a close ratio but all of my other cars I have picked up have been of the wide ratio type

rear axle ratio of car determined which toploader wide or close raio was installed at the factory.check your door tag for original axle ratio and it will follow the above post used for mustangs.