1855 Oliver mfd front/rear ratios

The tag on the front diff says says 24.6 to 1 for a ratio. When I turn the one wheel and count the drive shaft's revolutions however I end up counting 21 for each turn of the tire. I suspect the tag is wrong. I have 18.4x38 GY dyna torque ll tires on the back and have been using it with 14.9x26 FS traction field and road tires on the front.
What is the percent lead for this combination?
What should the true match ratio be for my 1855 with this differential?
This combination seems to work okay, although the front treads wore down after a while. I just changed one front tire with a 14.9x26 GY power torque and will need to change the other in the near future.

We are on flat land but we use this 1855 mostly for moving big heavy round bales in the field or feeding the cattle. I am not sure what is best but I am considering a 2 to 3% lead as a compromise between tire wear and traction.
So given that I have a spare pair of 24" d x 11” w wheels for the front and I also have two pairs of 20.8 Firestone tires
a: Traction field and road R1 or b: Radial all traction I could use on the back.
What combinations of tires can I use?
 
If you are only turning one wheel, the number of revolutions of the driveshaft should be 12.3 with one turn of the tire if the tag was correct. That is due to the differential gears. If you turn both wheels, the driveshaft would be 24.6 turns.
 
axle ratio of 24.6/1 is a bevel set of 6/41 drive shaft revolutions should 24 1/2 for every 2 revolutions of the tire rear axle should have a ratio of 23.7/1 I cant find my tire conversions yet Im looking
 
Remember the front wheel turns twice to one in back! (About) plus the weight of bale on front end.
Tire company's have MFWD tire to help with wear.
 
Well, in my earlier post, I would be correct for sure unless the front axle has a 'no-spin' unit in it. Might be different when you turn one wheel (if you COULD turn only one wheel).
 
It was a couple of years ago but now that you mention it I think I did turn the wheel 2 revolutions I looked up my notes from when I did it and it was 20 revs on the drive shaft. It definitely was not 24.5. I put the transfer case into neutral and jacked one side up. Then turned the free wheel to count the revolutions.
I also think that things are different for the 1755s because they came with 34" rear wheels whereas 1855s came with 38".
If I knew the match ratio it would help as well.
 

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