Reprogramming

2005 DODGE RAM
121,020 MILES • 5.7L • V8 • RWD • AUTOMATIC
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MASOY
  • MEMBER
  • 10 POSTS
Have a 1500. I swapped the rear axle because it went bad. The old axle had 3.21 gear ratio. The replacement axle has 3.92 gear ratio. I know the truck has to be reprogrammed for the new gear ratio.

Am I causing any damage driving the truck "un-programmed" to mechanic to have it reprogrammed?

Thanks
Matt
Jun 24, 2017 at 8:49 AM
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CJ MEDEVAC
  • ✓ASE Certified Mechanic
  • 11,004 POSTS
  • ASE Certified Mechanic
You should be fine.

Basically, it is like you installed smaller tires on it.

The Medic
Jun 24, 2017 at 10:41 AM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
You will have better pulling power, but you are going to lose some gas mileage due to the lower gearing even after it is reprogrammed to the new ratio.
Jun 25, 2017 at 7:00 AM
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