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#1 |
Registered User
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Location: Hendersonville, TN
Posts: 1,528
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What's my ratio?
I marked a spot on the driveshaft and then turned my hub and counted the revolutions. My driveshaft only went around a little less that 2 turns to the hubs 1. So, what's my ratio?
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BRENT ![]() -'68 Stepside Project -'98 Z71 Daily Driver -Enough extra parts to build another truck and a half |
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#2 |
Senior Member
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Location: Estherville, Iowa
Posts: 3,371
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Re: What's my ratio?
Turn the wheel around twice, or if you have the time, turn it 20 times, that will get you a spot on answer. For instance, if you turn the wheel 20 times and the ds goes around exactly 41 times, you have a 4.10 rear.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#3 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,516
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Re: What's my ratio?
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You can look on the housing (for Location see the pics below) then go here and look up the code: http://www.americanclassic.com/paint.htm You just need the first two or three letters.... LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#4 |
Registered User
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Location: Hendersonville, TN
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Re: What's my ratio?
Ok, I tried it again and got this
Wheel/DS 10/18 20/37 30/56 I don't understand your math, but according to that would that make mine a 3.73??
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BRENT ![]() -'68 Stepside Project -'98 Z71 Daily Driver -Enough extra parts to build another truck and a half |
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#5 |
Registered User
Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: What's my ratio?
Yes. 3.73. Now put a posi in it, and your golden.
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'70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60 |
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#6 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: What's my ratio?
How do we come up with 3.73?
3.73 would aprox.3 3/4 driveshaft turns to 1 axle turn.You`re coming up with around 2:1.
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#7 |
*************
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Location: Pensacola, FL
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Re: What's my ratio?
For a "one legger" I always multiply by 2......
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#8 |
Registered User
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Location: Hendersonville, TN
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Re: What's my ratio?
I still don't understand the reasoning, but I would trust it to be a 3.73 long before 1.80.
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BRENT ![]() -'68 Stepside Project -'98 Z71 Daily Driver -Enough extra parts to build another truck and a half |
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#9 |
Registered User
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Location: WAYNE, WV.
Posts: 675
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Re: What's my ratio?
I had my check and it came up with a2-1 the friend checking it said was coming up right so i pulled the cover it was a 373
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#10 |
GEARHEAD
Join Date: Aug 2003
Location: MN
Posts: 6,122
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Re: What's my ratio?
Because of the spider gears, if you have one wheel down and not turning, the ratio is half. If you were to roll the axle, both wheels down, the pinion would turn twice as fast. I just did this myself friday and figured it out. I don't think it works this way for a posi axle, but I'm not positive of that.
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