need help speedometer drive gear setup - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**gmc 2500 4x4** · 12-24-2014, 11:49 AM

what i have is a '69 gmc p/u 3/4ton 4x4 w/sm465/221 t/c. i need to swap out the 4:56 gears and want to go with 3:54 gears. i went and bought what i thought were correct parts and they are not. #3866919, 3866742 plus a reducer marked 1.3000 j (stewart-warner) round gear has 7 teeth, and longer gear has 22 teeth. what i pulled out (longer gear) has 12 teeth. 3866919 is much larger than what i have on top pic.

does any one know what i need to correct my problem?

12-24-2014, 11:49 AM	#1
gmc 2500 4x4 Senior Member Join Date: Mar 2012 Location: ripley ny Posts: 2,974	need help speedometer drive gear setup what i have is a '69 gmc p/u 3/4ton 4x4 w/sm465/221 t/c. i need to swap out the 4:56 gears and want to go with 3:54 gears. i went and bought what i thought were correct parts and they are not. #3866919, 3866742 plus a reducer marked 1.3000 j (stewart-warner) round gear has 7 teeth, and longer gear has 22 teeth. what i pulled out (longer gear) has 12 teeth. 3866919 is much larger than what i have on top pic.does any one know what i need to correct my problem? Attached Images

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