Checking rear-end gear ratio.
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Joined: May 2001
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From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
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St. Jude Donor '06-'10, '13
Checking rear-end gear ratio.
I understand there is a way to do this by turning the rear wheel once and counting how many times the driveshaft turns.
At least this is how I thought it would work.
Mine, I turn the wheel once, and the driveshaft turns 1 1/2 times.
What does this mean I have for a ratio.
P.S. -- it's not the Vette, but another Chevy -- 12 bolt.
Also, is there an external way to check if it's posi ?
At least this is how I thought it would work.
Mine, I turn the wheel once, and the driveshaft turns 1 1/2 times.
What does this mean I have for a ratio.
P.S. -- it's not the Vette, but another Chevy -- 12 bolt.
Also, is there an external way to check if it's posi ?
Drifting
Joined: Mar 2001
Posts: 1,514
Likes: 1
Re: Checking rear-end gear ratio. (BSeery)
To answer need to know if the other wheel spun while you were spinning the first one. Because if it spun the same way, then it's probably a posi rear end and you have a really funky rear end ratio :lol: If it spun the opposite way, not a posi and can't really figure the ratio. If it didn't spin at all you have a 3.50 : 1 ratio . Now it's 5am I just got home , have a wedding I'm the best man in tommorrow so there's a good chance there's a fault in my logic :lol: :lol:
Scott
Scott
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Joined: Dec 1999
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From: Forked River NJ
Re: Checking rear-end gear ratio. (Scott78)
Spin the one wheel and if the oppisite side turns the same way it is a posi. If it spins in the other direction it is a non posi. If it is a non posi the rotating the wheel trick does not always work. If you can with a non posi leave one wheel on the ground and spin the other. This should give you the proper rear ratio.
Drifting
Joined: Feb 1999
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From: Brandon FL
Re: Checking rear-end gear ratio. (Gordonm)
If the turns are accurate, sounds like you might have a 3.55. If it's a 3.55 posi, you'd have some folks kill for that gear. They can be hard to find. :smash:
Thread Starter
Team Owner
Joined: May 2001
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From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
CI 6-7-8 Veteran
CI-VIII Burnout Champ
St. Jude Donor '06-'10, '13
Re: Checking rear-end gear ratio. (joevette57)
Well, both wheels turned alright, but not the same direction. I dropped one side down and just spun one wheel. That is when I got 1 1/2 driveshaft turns to one wheel turn. Couldn't figure out the math as to what ratio that would mean.
I want a lower gear. This is for the truck that hauls parts for my C3.
By the way, the 1980 just got back from the shop. New rear bearings, bushings, strut rods, e-brake parts, shocks, u-joints, brake lines, AND installed 3.73 rear gears to go with my 700R4 transmission.
With the low first gear in the tranny, and the 3.73's in back, 1st gear is a very short one !
I want a lower gear. This is for the truck that hauls parts for my C3.
By the way, the 1980 just got back from the shop. New rear bearings, bushings, strut rods, e-brake parts, shocks, u-joints, brake lines, AND installed 3.73 rear gears to go with my 700R4 transmission.
With the low first gear in the tranny, and the 3.73's in back, 1st gear is a very short one !
