Transmission Ratios
#37908 from American Sedan Committee · Recommended to the Board · Minutes (2025-04 Fastrack)
In GCR, Section 9.1.6.3.a., add the following:
"(Effective 6/1/2025) 3. All Cars
a. Any four speed transmission maybe used with gear ratios 2.20, 1.64, 1.28, 1.00 or 2.88, 1.91, 1.33, 1.00.
If ratios 2.20, 1.64, 1.28, 1.00 are used 50lb weight penalty will be added.
b. Tremec TKX with ratios 2.87, 1.89, 1.28, 1.00, .81 is allowed."