My 68 Firebird with 428 and RAIV cam runs a TKO-600 with a 3.5 rear gear. Overall, the gearing is perfect for the first 4 gears. 5th requires me to be doing 50mph minimum to use. On a highway at 70mph, its terrific.
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Regards,
Leigh
Pontiacs I’ve owned….
1960 Laurentian 283
1963 Laurentian 283
1976 Trans Am 400
1977 Trans Am 400
1951 Chieftain Flat head 6
1967 Firebird 400 convertible
1967 Firebird 400 coupe
1979 Trans Am 403
1971 Formula 455 (clone)
1969 Firebird 350
1968 Firebird 428 manual.
Sydney, Australia
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