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If it's still there the build sheet is on the glove box door. If it's anything but the defualt axle ration for the year it will be listed. Default in 78 should be 3.08. Towing package on my 79 K5 4x4 was 3.73 gears.
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Grim-Reaper
70 Pontiac LeMans Sport Convertible, worlds longest resto in progress
Looking for 71-72 2wd Blazer or Jimmy Project
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