!972 Vauxhall Ventora with a Powerglide 'box had just 2 speeds, behind a 3.3 litre straight 6.
I had one during the 'eighties, the 2 gears were perfectly adequate & the car was surprisingly economical for it's engine capacity.
I had the manual version, very torquey engine. Four gears, with overdrive on 3rd and 4th. Towing a caravan made little difference to the fuel consumption.

