Verifying Banjo Ratio

1

1932chevy

Member
With the axle on the ground, what would be the correct method in verifying the gear ratio by means of pinion revolution and drum revolution. Do I have to lock up one wheel? Let's say I didn't lock up one wheel and got 2.25 revolutions per drum rev can anyone tell me if its a 4:11 or 3:78?

Any one have a 3:78 rear that they could spin and help me out?
 
The way to do it is lock one wheel from turning and count the turns of the pinion to make the free wheel turn two times. If you did it this way but only made the free wheel turn once and got 2.25 turns, you have an about 4.50 ratio.
 
1932chevy said:
I'm Trying to verify that the gears are original to the housing
Click to expand...

Put in high gear, jack up one wheel and mark it now turn the engine with a wrench or crank and count the revolutions of the crankshaft until the wheel makes two complete revolutions. Three and three quarter turns would be 3.78.
It's a lot easier on a open drive shaft.
Bill
 
Pull the filler plug, mark end of one of the ring gear teeth with either paint or chaulk, turn a wheel with the other wheel down and trans. in neutral and count teeth on ring gear.
 
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