CK5
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... How can I know my gear ratio from my vin # ???
- Thread starter Saad
- Start date
Dabba
1/2 ton status
Better yet, assuming the axles/gears on your truck is stock. You can look in the glove box for the manufacturing code and look that up or post it here, sure someone will know it.
Slapperbar
Retired Navy NDT Examiner
Need the codes from the glove box. GT3, GT4 or whatever.
Yukon Jack
1/2 ton status
Rather than guessing - a very simple way to figure out your gear ratio is to put a white chalk mark on your rear driveshaft and one on a tire - have someone drive your vehicle slowly forward as you count how many driveshaft rotations happen for one tire rotation. Just over 3 rotations equals 3.08 gears, about 3 3/4 rotations equals 3.73 gears, just over 4 rotations equals 4.10 gears, 4 1/2 rotations equals 4.56 gears.
Just because your diff tag or vin tells you one thing, doesn't mean your gears haven't been changed - this way gives you a definite answer and is simple.
Just because your diff tag or vin tells you one thing, doesn't mean your gears haven't been changed - this way gives you a definite answer and is simple.
Slapperbar
Retired Navy NDT Examiner
Vin won't tell gear ratio.
Slapperbar
Retired Navy NDT Examiner
Vin gives us this:
Country: USA
Model year: 1991
Engine: 350 V8
Series: 1/2 ton (10/15)
Body: Blazer/Jimmy
Plant: Flint
Serial #: 527544
GVWR: 6001-7000 hydraulic
Courtesy of Dremu's web page. http://brochures.slosh.com/
Country: USA
Model year: 1991
Engine: 350 V8
Series: 1/2 ton (10/15)
Body: Blazer/Jimmy
Plant: Flint
Serial #: 527544
GVWR: 6001-7000 hydraulic
Courtesy of Dremu's web page. http://brochures.slosh.com/
resurrected_jimmy
1/2 ton status
if stock it will most likely be 3.42 (not sure if these were popular on the 88-91 trucks) or 3.73 from the vin info posted above
