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biged68

gears ?

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i recently tore the rear pinion out of my truck. i have 3.55 gear in my dana 70. i have a guy i go to church with that is gonna give me a free set of 4.56 gears that cam out of a 90 model dana 60 front and dana 70 rear. my question is, will the 4.56 be to low of a gears for pulling with my setup? im pulling with 35x12.50 tires

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will the 4.56 be to low of a gears for pulling with my setup? im pulling with 35x12.50 tires

 

It would greatly depend on your gear ratio of the transmission and transfer case whether or not they will work. It's overall ratio that is most important. And this number is dependant on power level and planned rpm (somewhat on tire diameter). This will tell you if the 4.56 is the way to go (or not).

 

Example: trans 3.58 x case 1.96 x axle 4.10 = 28.76

 

If I were to change from 4.10's to 4.56's, it would now be 31.99, over a 3 point difference in overall ratio. This would significantly lower my wheel speed and increase rpm.

 

Do the math on your truck and see what works for you. I know that diesels run ratio's much higher (numerically lower) gear than gas, but principal is the same.

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