Verifying Banjo Ratio
 

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?

Re: Verifying Banjo Ratio
 

Near impossible with a torque tube.

Re: Verifying Banjo Ratio
 

Sorry for not clarifying, the rear is of the car. No torque tube.

Re: Verifying Banjo Ratio
 

The bottom rib under pinion has numbers stamped-example 9-34 divide is 3.777777.

Re: Verifying Banjo Ratio
 

I'm Trying to verify that the gears are original to the housing

Re: Verifying Banjo Ratio
 

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.

Re: Verifying Banjo Ratio
 

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

Re: Verifying Banjo Ratio
 

Here is an old post that has a slightly different approch on how to do this......

http://www.fordbarn.com/forum/showth...rear+end+ratio

Re: Verifying Banjo Ratio
 

Andy I didn't lock the opposing wheel, stupid me. Well worst case, I'd have to spend 300+ for a new 3:78 gear set

Re: Verifying Banjo Ratio
 

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.

Re: Verifying Banjo Ratio
 

This turned out to be the best option for me, thanks.

Re: Verifying Banjo Ratio
 

And the ratio is...? Just curious:cool: