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Topic: Gear Ratio

in Forum: C3 Driveline Components


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Gear Ratio

Posted: 10/19/06 8:16am Message 1 of 4
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OH6A
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Cadiz, KY - USA
Joined: 8/26/2002
Posts: 249
Vette(s): 74 Convertible
73 automatic transmission, 190 HP, nothing fancy.  Assuming everything is still standard, what is my gear ratio.  I can't find the numbers on the case.


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Gear Ratio

Posted: 10/19/06 8:48am Message 2 of 4
71Shark
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Edmond, OK - USA
Joined: 7/13/2006
Posts: 400
Vette(s): 1971 Brands Hatch Green L48 Coupe Automatic Driver - restored 1995

My book shows standard as a 3.36:1 with optionals of 3.70:1, 3.08:1, 3.55:1 and 4.11:1.  Personally I thought the standard ratio was 3.08:1.  Put it in the air and give it a spin.




Gear Ratio

Posted: 10/19/06 11:04am Message 3 of 4
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20219
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Most automatic L48s had the 3.36 ratios, but the 3.08 is the standard ratio...
These are the only two ratios available for the 400 with the L48.

The axle code(s) will be on the very bottom of the diff., just in front of the spring, close to where the cover bolts onto the diff housing.

AW = 3.08
AX = 3.36
LR = 3.36Adams' Apple2006-10-19 18:31:41


Joel Adams
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Gear Ratio

Posted: 10/19/06 7:56pm Message 4 of 4
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Redwingvette
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Waterford, MI - USA
Joined: 9/13/2002
Posts: 1755
Vette(s): 1973 Red coupe
mine came with a auto and the 3.08 gears. I replaced it with a 3.55 even before I put in the od trans. What rpm's do you see at 70mph? With the 3.55 I was almost 3300rpm's.  with a 3.08 you should see around 2700rpm's. Here is a calculator: http://richmondgear.com/101032.html


Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans
Borgeson Steering box
 


in Forum: C3 Driveline Components


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