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09-03-2006, 10:49 AM
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#1 |
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Registered User
Join Date: May 2006
Location: Calif
Posts: 43
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Rear end ratio
I recently purchased two 3/4 ton trucks, how do I tell the rear end ratio's? Someone said mark and spin the rear tire and mark the drive shaft, then count the shaft turns but the shaft only spins 2.25 times. How can I tell the ratio? is there a mechanical way and is there a code to tell me what these two different trucks have?
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09-04-2006, 09:07 AM
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#2 |
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Registered User
Join Date: Mar 2005
Location: Edmonton, Alberta Canada
Posts: 30
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Re: Rear end ratio
You might have a code sheet on the glove box door...
GU4 - 3.08 GU6 - 3.42 GT4 - 3.73 GT5 - 4.10
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__________________ Dave '87 Chevy Pickup (Nice)  '75 CB750K Four Honda (beautiful) Quiet (stock exhaust) Till you get on it then she... Sounds Like a Porsche |
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09-05-2006, 06:02 AM
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#3 |
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Junior Member
Join Date: Aug 2006
Location: Henderson,Ky.
Posts: 80
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Re: Rear end ratio
Count the number of teeth on the ring gear and the pinion gear.Divide the pinion number into the ring number.If ring has 41 and the pinion has 11.
41/11=3.727272...round it and it's 3.73.
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Scott C. 84 Custom Deluxe(under Construction) 87 Buick Grand National 91 Gmc Sierra daily driver Last edited by 84Custom; 09-05-2006 at 03:55 PM. |
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09-05-2006, 03:07 PM
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#4 |
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Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Re: Rear end ratio
my 86 has 3.42s
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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09-06-2006, 10:27 PM
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#5 |
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Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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Re: Rear end ratio
If you leave one rear wheel on the ground, you can turn the other one TWO full turns and count the driveshaft turns to get your ratio. Or just double the count if you go one full turn. If both wheels are up, the wheel you can't see will likely turn some and that will throw everything off.
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