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There is no rhyme or reason. Some cars they work on, and some others they have no benefit. Too many suspension variables to factor in. The General Rule > is to try one and see what happens.

1965 thru 1967 'A-904' Transmission 'Heavy-Throttle' Upshift Points ~ Dart, Valiant and Barracuda Gear Upshift ........273 {2-Barrel} ............ 273 {4-Barrel} * 1st to 2nd .......... 42 MPH ...................... 45 MPH * 2nd to 3rd .......... 67 MPH ...................... 80 MPH...

* High-Speed Governor {Allowed for higher up-shift points} * Wider Ring-Gear for the Torque-Converter Things get cloudy with the Torque-Converter. The standard 273 {2-Barrel} unit was rated at 1800 RPM's. Though Fred Hines, who ran a 1965 Barracda '237 Commando' in F/SA for the factory...

'Factory Stock' A-904 Torque-Converters 1967 and earlier ......... 18" Spline Input Shaft 1967 and earlier.......... 10.75" Diameter 1967 and earlier ......... 1800 RPM 'Stall-Rate'

A-904 Torque Converter * Stock Stall Rate ....... 1800 RPM's * 185/75 R-15 ............ 25.0" Tire Diameter * Gears ..................... 3.23 * Comp-Cams #260AH-8 'Magnum Muscle' * Type ....................... Hydraulic * Lift ......................... .444"/.444" * Duration...

Johnny Fix-It, Go with 27" tall tires, and go for the newer ratio > 3.73's. Johnny likes the 3.73's with the Lunati 'VooDoo' 268* Camshaft.

Engine Combination * Edelbrock Air-Gap * Holley 650 Double-Pumper * Lunati 'Voodoo' 268 {#60403} Doesn't everything point to a little more RPM's. Going down to 3.23's may suffocate that 340 during 'around town hopping'.

Tire Size ...... 245 - 60 x 15" ........ 26.6" Tall Old School .... F70 x 14 ............... 26.2" Tall Everything points to +3.55's with the VooDoo 268 Camshaft, if it's the #60403 Bumpstick. And the Holley 650 Double-Pumper. Too bad you couldn't get a taller tire.