Loss in top end / speed acceleration

Tiny
TONY GRAYBIL
  • MEMBER
  • 2004 DODGE RAM
  • 4.7L
  • V8
  • RWD
  • MANUAL
  • 110,000 MILES
I recently changed diff gear ratio from 5.40 to 4.11 (due to to reduction in tire size). The end performance resulted in top end speed reducing to 85mph @ 3500rpm in 5th gear. Will not accelerate past this due to the engine cut out. I do know that the computer needs to be re calibrated, and I am looking to find a good programmer in order to do this. Any recommendations you can give me would be appreciated. Thanks.

- Tony Graybill
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Saturday, April 18th, 2015 AT 6:34 AM

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Tiny
HMAC300
  • EXPERT
Check online we don't do that
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Saturday, April 18th, 2015 AT 7:10 AM

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