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#1 |
Full Time Loser!
Join Date: Feb 2003
Location: Murfreesboro Tennessee
Posts: 65
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What Final gear ratio?
I am trying to figure out what the final gear ratio is of my 1978 Chevy Silverado. Can anybody help? I looked on the Rear end thinking it may be there but its not. Is there a place on the truck where its located or a way of finding out?
1978 Chevrolet Silverado 350 4bl TH350 12bolt rear end
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1979 C10 - Its being rebuilt. 1978 Silverado - Its being driven. ![]() 1995 Grand Prix GTP - Its stock ![]() |
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#2 |
Happy to be here
![]() Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
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Did you check the glove box? My 77 still has the build tag in there. It shows all the options (or lack of) on my truck, including the gear ratio...
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#3 |
Full Time Loser!
Join Date: Feb 2003
Location: Murfreesboro Tennessee
Posts: 65
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I checked the Glove box and found the Options sheet but it doesn't say what the Rear end is.
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1979 C10 - Its being rebuilt. 1978 Silverado - Its being driven. ![]() 1995 Grand Prix GTP - Its stock ![]() |
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#4 |
Registered User
Join Date: Mar 2003
Location: Walker, LA
Posts: 2,925
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If you have a tach, check your RPM's at 60 MPH and work backwords through a gear calculator
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Gary -1986 SWB: lowered 4/6, SOLD!!! -Best 1/4 mile: 14.51 @ 91.01 MPH -2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!! -2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels |
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#5 |
Happy to be here
![]() Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
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Does it have the original seat in it? There is sometimes a build sheet slipped in the springs under the seat. It may have it on there.
According to the experts, it is on your rear end, but is hard to see. I have never verified mine, so I can't tell you where it's at exactly. If I remember correctly, it is stamped on the back side of the axle tube close to the pumpkin, and (maybe) on the right side... |
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#6 |
Full Time Loser!
Join Date: Feb 2003
Location: Murfreesboro Tennessee
Posts: 65
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No Tach. I will check the Seat tomorrow.
As for the Rear end I looked all over and I could not find it. I will look tomorrow again though.
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1979 C10 - Its being rebuilt. 1978 Silverado - Its being driven. ![]() 1995 Grand Prix GTP - Its stock ![]() |
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#7 |
Registered User
Join Date: Nov 2002
Posts: 272
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Well if its time to change the oil in the rear end just count the teeth and divide the ring by the pinion gear
ex: 37 teeth on ring 12 teeth on pinion =3.08 ratio |
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#8 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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You will have to clean everything real good to see it, but if you look on the passenger side axle tube, on the front side, about 4 to 6 inches out from the center section, there is a stamped code. It's small, about 1/8" or so in size. It's very hard to see sometimes as it was die punched and not cast into it.
Anyway, if you can find this code, let me know what it is and I can tell you what it came with from the factory.
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Mike 1985 Chevy C-10 |
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#9 | |
Happy to be here
![]() Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
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Quote:
I was pretty close, except it's on the "front" side, not the back. Thanks for bailing my failing memory out Mike... |
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