1935 banjo rear ratio

how can you determine rear ratio without dismantling rear end. i'm getting aprox 2:1 by turning axle one full turn. this doesnt even make sense. Ive done this before on newer rear ends and been at least in the ballpark. rear came out of 1935 ford 4dr sedan. thanks rob drew

 

If you are turning one axle and holding the other from turning you have to go two turns. That would put you at 4:1 ballpark.

 

There are numbers stamped on the bottom of the center section up towards the pinion, divide the smaller one into the larger one and that's your ratio.

example: 34/9= 3.78

 

hate to seem dumb but you are saying 2 turns on axle and 1 turn on pinion=approx 4:1 (if you are keeping 1 axle from turning)

 

If you turn the drive shaft and hold one axle from turning the axle will turn twice as fast as if both axles turn together because of the spider gears.
Because of this if you are only letting one axle turn you must use 2 turns of the axle and count the number of times the d-shaft turns to get the ratio.
Count the number of turns of the driveshaft it takes to make one axle
turn 2 revolutions. D-shaft 4 turns to axle two turns = approx 4-1 or
4:00 ratio. Would probably be 4:11.

 

both wheels off the ground, mark the drive shaft and bottom of one tire. turn the drive shaft and count the turns til the tire mark is on the bottom again. count how many times the drive shaft turned to get tire to the bottom. example. if drive shaft turns 3 1/2 turns to get one revolution of tire, ratio equals 3:50 gear ratio.

 

thanks fellas. I think I got it.

 

most of them are 411's