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All though the 26 inch radiator is coded the 3.91 would not be or at least not on my AAR or any other I've seen for that matter.



AARs and TAs only came with 3.55 or 3.91 axle ratios and both those gears required the 26" radiator. You only find the gear ratio for those two cars on the original paperwork (BS, window sticker, etc). Otherwise, the code A31 or A36 will be coded on the tag.