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Jack it up, put it in neutral, turn the tire, and count the revolutions of the driveshaft for 1 revolution of the tire.  It will get you an idea if you accurately make the yoke and wheel before you start turning.  

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15 hours ago, Hobert62 said:

Jack it up, put it in neutral, turn the tire, and count the revolutions of the driveshaft for 1 revolution of the tire.  It will get you an idea if you accurately make the yoke and wheel before you start turning.  

Make sure the other side stays on the ground or it will spin and throw off your count.

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For the correct count you need wheels at the both sides to turn together. If you have one on the ground (locked from turning) you count must be divided by 2 since the only wheel is forsed to make 2 times more revs by differential.

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Никогда не бывает слишком много грузовиков! leversole 11.2012

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Worth to add. The most accurate count of the reatio is count of actual number of the teeth. But complete carrier remove could be required. Talking about Mack tandem carriers you can count the teeth of the upper (bewel) set of gears through the side cover opened but not the lower (bull) ones.

Никогда не бывает слишком много грузовиков! leversole 11.2012

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5 hours ago, Vladislav said:

For the correct count you need wheels at the both sides to turn together. If you have one on the ground (locked from turning) you count must be divided by 2 since the only wheel is forsed to make 2 times more revs by differential.

You're right, divide by 2. When I have both wheels off the ground, the opposite wheel usually spins backwards, throwing off the ratio count.

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1 hour ago, 1wonton said:

Thank you j, this was helpful.  I found the numbers are depicted in the tech sheet but it doesn't tell me much.  The carrier says CRDP 92.161.66, what does this mean?

 

 

ron

It should be right next to the stuff you found, sometimes stamped, or numbers made by a center punch, sometimes real light.     terry:MackLogo:

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Look more over that square spot on the carrier front. Usually at the right side at the the bottom are numbers indicating the ratio. They're standing apart from the rest. Something like 5.02 or 4.46 or 5.73 etc.

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Никогда не бывает слишком много грузовиков! leversole 11.2012

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Ya, back when power was low, gearing was slow.

What transmission?  If it is single OD, then 55 is likely about it.  My B had 4.62's and would go 65 mph flat out.  A double over would get you closer to 65 mph.

IMG-20180116-202556-655.jpg

Larry

1959 B61 Liv'n Large......................

Charter member of the "MACK PACK"

 

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