If you counted the driveshaft revolutions against
one tire rotation with only ONE WHEEL RAISED you need to double your final number,1.8= 3.60/1. It's more acurate to raise both wheels assuming you have a stock open rear. My '55 powerglide car
has a 3.55/1. Not sure what the trucks have.You
can always open the rear and count the ring and
pinion teeth.
