Lookin for NHRA Stock Class ET/MPH from 1970-71

bill dedman · 06-27-2016, 02:12 AM

1. The problem with a Turboglide was, it held the engine at about 3,500 rpm until it was going about 75 mph... Only then, after it was in 3rd gear (1:1) would the rpms start increasing. A small block Chevy doesn't make much power at 3,500 rpm... so, no, not many people ran them...

2. The Slim Jim was a 3-speed automatic that suffered from having one too few gears; it acted like a 4-speed automatic that was missing second gear... the large rpm drop from 1st to second was excerbated by the fact that second was a direct (mechanical) application of engine torque (had no power going through the fluid coupling) so there was no "slip" at all,and this droppped the rpm even further.. not a good thing.

2. I don't know which transmission the Cox cars ran, but if I had to guess, I would imagine that they all ran the two-fluid-coupling, 4-speed transmission; the Slim-Jim was too fragile and slow to be effective.

Oldsmobile called that big-car transmission "Jetaway HydraMatic", while Pontiac called it "Strato-Flight HydraMatic"..... same transmission. I have never seen either referred to as a "Super HydraMatic."
Sorry I don't know more about the Cox cars... but, I seem to remember that the Cox race cars were always high-performance versions, and as such, would not have come with the Slim Jim boxes.

06-27-2016, 02:12 AM	#28
bill dedman VIP Member Join Date: Feb 2002 Location: Conway, AR Posts: 1,739 Likes: 0 Liked 6 Times in 4 Posts	Re: Lookin for NHRA Stock Class ET/MPH from 1970-71 1. The problem with a Turboglide was, it held the engine at about 3,500 rpm until it was going about 75 mph... Only then, after it was in 3rd gear (1:1) would the rpms start increasing. A small block Chevy doesn't make much power at 3,500 rpm... so, no, not many people ran them... 2. The Slim Jim was a 3-speed automatic that suffered from having one too few gears; it acted like a 4-speed automatic that was missing second gear... the large rpm drop from 1st to second was excerbated by the fact that second was a direct (mechanical) application of engine torque (had no power going through the fluid coupling) so there was no "slip" at all,and this droppped the rpm even further.. not a good thing. 2. I don't know which transmission the Cox cars ran, but if I had to guess, I would imagine that they all ran the two-fluid-coupling, 4-speed transmission; the Slim-Jim was too fragile and slow to be effective. Oldsmobile called that big-car transmission "Jetaway HydraMatic", while Pontiac called it "Strato-Flight HydraMatic"..... same transmission. I have never seen either referred to as a "Super HydraMatic." Sorry I don't know more about the Cox cars... but, I seem to remember that the Cox race cars were always high-performance versions, and as such, would not have come with the Slim Jim boxes. __________________ Bill Last edited by bill dedman; 06-27-2016 at 02:16 AM.