Gear Ratio Question

From what I recall, an acert liked to be ran lower rpms. What transmission do you have? I would think 3.36 would be much better. You say light loads, do you mean tandem van? Light loads to one guy could be heavy to another.

 

Is your truck a tandem spec truck? 12 front, 40 rears? If so, drop 3.36 gear sets in. Have your ecm recalibrated for different gearing, and while doing that, have a file put in it for increased fuel mileage. Where are you located?

 

Is Mr. Haney still around? From what I remember, he worked magic on the Cats.

 

It won’t be cheap because you have heavy rear ends, and with the current cost of fuel it will take a long time to recover the cost of doing the swap. But basically you take the guts out of your pumpkins and put new guts in, same as if your rear end went out, only you’re doing it with a different ratio than you currently have.

 

What he said ^

46 rears will be costly to swap to 3.36. Then you also have the issue of an odd gear ratio in a heavy spec truck when the time comes to sell.

I know for just a 40 rear setup you’d probably be looking at 10g to swap. 46’s, probably closer to 15g.

 

Won’t know for sure till you price it out. Take your vin to the dealer or any shop and they can quote your gear sets and labor. All I know is I had to replace a 3.70 front gear set and power divider. Cost was $5000.