Transmission Gear Ratio Change Proposal
#29669 from Pamela Richardson · Recommended to the Board · Minutes (2021-01 Fastrack)
In GCR, Section 9.1.6.D.3.a.1.a., change as follows:
"a. Any H-Pattern 4 or 5 speed transmission is permitted with the following gear ratios:
Wide Close
1st gear numerically greater than 2.50 numerically greater than 2.20
2nd gear 1.86 to 2.32 1.50 to 1.81
3rd gear 1.28 to 1.50 1.20 to 1.37
4th gear equal to 1.00 equal to 1.00
5th gear numerically less than .78 numerically less than .80
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Utilizing close ratios are permitted at a weight penalty of 75 lbs. listed on the vehicle spec line (with a tolerance of +/- .05 pergear). 4 speed transmissions must match either 4 speed gear ratios listed on their specification line or one of the car’sspecification line 5 speed gear ratio sets for gears 1 through 4, with a tolerance of +/- .05. Sequential shifting transmissions are
prohibited. Pneumatic, hydraulic or electric actuation of the gear shift mechanism is prohibited. Transmissions that use a gear
engagement mechanism different than stock type (e.g., circular, beveled) are prohibited. Face-tooth engagement gearboxes
(e.g., dog rings) are permitted at a weight penalty of 50 lbs. Any first gear ratio greater than 2.5 is permitted."
In AS, Spec Lines, Chevrolet/Pontiac Camaro & Firebird (82-92), change as follows:
Gear Ratios: "3.42, 2.28, 1.45, 1.00 or 2.95, 1.94, 1.34, 1.00, 0.73 or 3.35, 1.93, 1.29, 1.00, 0.61 See 9.1.6.D.3.a.1.a."
Notes: " Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted."
In AS, Spec Lines, Chevrolet Camaro (10-15), change as follows:
Gear Ratios: "2.95, 1.94, 1.34, 1.00, 0.73 Or 3.35, 1.93, 1.29, 1.00, 0.61 See 9.1.6.D.3.a.1.a."
Notes: " Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted."
In AS, Spec Lines, Ford Mustang Incl. Cobra & Cobra R (79-93), change as follows:
Gear Ratios: "3.07, 1.72, 1.00, 0.70 or 2.95, 1.94, 1.34, 1.00, 0.63 or 3.35, 1.99, 1.33, 1.00, 0.68 See 9.1.6.D.3.a.1.a."
Notes: " Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted."
In AS, Spec Lines, Ford Mustang Incl. Cobra thru 95 (94-98), change as follows:
Gear Ratios: "2.95, 1.94, 1.34, 1.00, 0.63 or 3.35, 1.99, 1.33, 1.00, 0.68 See 9.1.6.D.3.a.1.a."
Notes: " Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted."
In AS, Spec Lines, Ford Mustang Incl. Cobra (99-04), change as follows:
Gear Ratios: "2.95, 1.94, 1.34, 1.00, 0.63 or 3.35, 1.99, 1.33, 1.00, 0.68 See 9.1.6.D.3.a.1.a."
Notes: " Alternate gear ratio sets 2.88, 1.91, 1.33, 1.00 or 3.27, 1.98, 1.34, 1.00, 0.68 are permitted."
In AS, Spec Lines, Mercury Capri (79-86), change as follows:
Gear Ratios: "3.07, 1.72, 1.00, 0.70 or 2.95, 1.94, 1.34, 1.00, 0.63 or 3.35, 1.99, 1.33, 1.00, 0.68 See 9.1.6.D.3.a.1.a."