The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

shifty · 06-29-2005, 10:56 PM

It's been asked enough that I know the answer

Put a mark on the driveshaft. Lift one rear tire and release the e-brake. Count how many times you gotta spin the tire for the mark on the driveshaft to make one full rotation. Thta equals (approximately) your gear ratio.

Example: If it takes 3¾ tire spins to make the driveshaft travel around once, you have 3.73 gears or close to it. 3 times would be 3.07 or whatever. 4 would be 4.11 or whatever. I don't know the exact numbers, I'm taking those off my head from reading previous other posts.

06-29-2005, 10:56 PM	#2
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,373	It's been asked enough that I know the answer Put a mark on the driveshaft. Lift one rear tire and release the e-brake. Count how many times you gotta spin the tire for the mark on the driveshaft to make one full rotation. Thta equals (approximately) your gear ratio. Example: If it takes 3¾ tire spins to make the driveshaft travel around once, you have 3.73 gears or close to it. 3 times would be 3.07 or whatever. 4 would be 4.11 or whatever. I don't know the exact numbers, I'm taking those off my head from reading previous other posts. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.