***TECH TIP: CHEVETTE GEAR RATIO CHART***

[DOCTOR FIELDS]

Chevette Rear Axle Specifications:

Ring Gear Diameter: 6.5"
Pinion Shaft Offset: 1.125"

Ring And Pinion Ratios Available For The Chevrolet Chevette: (3.36:1) (3.62:1) (3.70:1) (4.11:1)

1976 - 3.70:1 Except 4.11:1 w/1.6 Liter Engine
1977 - 3.70:1 Except 4.11:1 w/1.4 Liter Engine, Or Automatic Transmission
1978 - 3.70:1
1979 - 3.70:1
1980 - 3.70:1
1981 - 3.70:1 Except 3.36:1 (Scooter)
1982 - 3.36:1
1983 - 3.36:1
1984 - 3.36:1 Or 3.62:1
1985 - 3.36:1 Or 3.62:1
1986 - 3.36:1
1987 - 3.36:1

The 4.11:1 ratio was an option in 1978, and was dropped in 1979.

[troyk3]

Hey Fields do you know the numbers on the rear end gears, I am looking for a 362 and was wondeing what numbers to look for


Thanks

[troyk3]

Also does anybody know the gear ratio's in the 4 speed chevette trans

Thanks

[DOCTOR FIELDS]

4 Speed Gear Ratios

Gear Ratio
1st 3.76:1
2nd 2.16:1
3rd 1.38:1
4th 1.00:1

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3.62 = 13 teeth Pinion Gear / 47 teeth Ring Gear

The photo below is NOT a 3.62 it is a 3.36, but gives you an idea of the location of the numbers stamped on the ring gear. 3.36 = 14 / 47

[troyk3]

Thanks, thats wanted I needed

[troyk3]

Hey Fields, this is what Im coming up with the formula
but on the track ( 1/4 ) I am running about 7800 rpm around 60 mph with a 336 gear , I wanted to see if I could bump it up to a 3.62 but something doesnt look right. Am I forgetting something in the formula or doing it wrong

(5280/((215*.60*.0787+13)*.2618))*3.36*2.16*1 = 6322 rpm's

(5280/((215*.60*.0787+13)*.2618))*3.62*2.16*1 = 6811 rpm's

(5280/((215*.60*.0787+13)*.2618))*3.70*2.16*1 = 6961 rpm's

(5280/((215*.60*.0787+13)*.2618))*4.11*2.16*1 = 7733 rpm's