CLASS RACER FORUM - View Single Post

bill dedman · 04-01-2010, 09:37 AM

Thanks for the great info, Jim!

The amazing thing was that any of those ('57-up cars {Pontiacs}) would even get out of its own way with that miserable Jetaway/Strato-Flight, dual-coupling transmission. If they'd just left a Dual Range Hydro in those cars for three or four more years, you'd have SEEN some "runners"!!! Oh well, at least it didn't have a torque converter...

To its credit, it did have marginally better ratios than the Dual Range units (3.95; 2.55; 1.55; 1;1 vs.. early Dual Range's 3.81; 2.63; 1.45; 1:1.)

In '56, G.M. engineering gave the Pontiac's Dual Range Hydros a 1.55 third gear which resulted in ratios of 4.08; 2.55; 1.55 and 1:1, a big improvement over that huge 2nd-to-3rd gap in the earlier transmissions.

04-01-2010, 09:37 AM	#3
bill dedman VIP Member Join Date: Feb 2002 Location: Conway, AR Posts: 1,739 Likes: 0 Liked 6 Times in 4 Posts	Re: Oddball Muscle Cars Thanks for the great info, Jim! The amazing thing was that any of those ('57-up cars {Pontiacs}) would even get out of its own way with that miserable Jetaway/Strato-Flight, dual-coupling transmission. If they'd just left a Dual Range Hydro in those cars for three or four more years, you'd have SEEN some "runners"!!! Oh well, at least it didn't have a torque converter... To its credit, it did have marginally better ratios than the Dual Range units (3.95; 2.55; 1.55; 1;1 vs.. early Dual Range's 3.81; 2.63; 1.45; 1:1.) In '56, G.M. engineering gave the Pontiac's Dual Range Hydros a 1.55 third gear which resulted in ratios of 4.08; 2.55; 1.55 and 1:1, a big improvement over that huge 2nd-to-3rd gap in the earlier transmissions. __________________ Bill Last edited by bill dedman; 04-01-2010 at 09:46 AM.