# 1.75ish gear ratio?

Discussion in 'The Garage' started by colbystephens, Oct 10, 2005.

1. ### colbystephens1 ton statusGMOTM Winner

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ok, so i was checking the gear ratio in my front ten bolt today as i am needing to go pick up a rear end for my truck, and when i did the basic spin the wheel once and count how many times the drive shaft spins trick, it only spun about 1.75 times. did i do something wrong? i don't think a gear ratio that high was offered in our trucks. what do you think?

colby stephens
www.web.pdx.edu/~colbys

2. ### BlitzK51/2 ton status

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Yeah I tryed that method once before too and the driveshaft hardly spinned. So I pulled to cover and checked the ring gear to find out. The 14 bolt i got turned out to be 3:73. Most stock blazers were 2.73's or 3.08's.

3. ### colbystephens1 ton statusGMOTM Winner

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you give me hope, but how does that work?

colby stephens

4. ### 4xcrazy3/4 ton status

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if you are spinning only one tire, you have to take into consideration the spider gears spinning as well,,someone else will get in here and explain it some more.

5. ### colbystephens1 ton statusGMOTM Winner

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maybe that's the case - i only had one tire off the ground. i'm not too familiar with the mechanics of differential gears . . . - yet.

6. ### BlitzK51/2 ton status

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There will be a GM number then 4 numbers after that on the side of the ring gear. Take the first 2 numbers and divide and that will be your ratio

7. ### colbystephens1 ton statusGMOTM Winner

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yeah - i've read about that, i just didn't have the time to pull the cover while i was near my truck today. it's about an hour away from home and i was driving thru to pick up parts to take to the machine shop.

8. ### tRustyK5Big meanieStaff MemberSuper ModeratorGMOTM WinnerAuthor

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Spin the tire twice. I'd guess you probably have 3.42's though.

Rene

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