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#11
09-25-2025, 09:31 PM
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The speedo adaptor was an external gear reducer that screwed in between the speedo cable and the transmission. It was only used on turbo hydramatic transmissions when a 3.90 or 4.33 axle was selected. This was because the th400 didn’t have the right combination of drive and driven speedometer gears for those ratios. The alternative was to have a different speedo drive gear on the output shaft. This would have required a different transmission application. It was cheaper to just have an external screw on device that corrected the cable speed, especially for the very low volume of cars needing it. The manual transmissions used different gears and didn’t have that ratio limitation.
To think that that 1946 is less than 20 years separated from the muscle car era. It’s amazing how much cars changed in a decade back then.
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My Break Away Squad 1969 Fbird (base OHC, 350, 400HO & Sprint Cvt’s - 400HO & TA ht’s) 1969 Custom S 2dr ht 1969 LeMans (2dr & 4dr ht & Cvt) 1969 LeMans Safari wagon 1969 GTO (2 Cvt, 2 ht & Judge ht) 1969 Cat (3 Cvt’s & a 2dr ht) 1969 Ventura wagon 2 seat 1969 Exec 4dr post 1969 2 Bonnie Cvt's & 2 wagons 1969 Bonnie Brougham (4dr ht & Cvt) 1969 Grand Prix 2 SJ’s 1969 2+2 2dr ht (Canadian) |
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