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Rear end swap

Tiny
MASOY
  • MEMBER
  • 2005 DODGE RAM
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
  • 120,000 MILES
Have swapped rear ends in truck. I went from the original rear end axle assembly which had 3.21 ratio to 3.92. Do I need to reprogram the computer to the higher gear ratio? If so how much would that cost? Or can I rent a programmer and do it myself?
Wednesday, April 19th, 2017 AT 5:14 PM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
No, you cannot rent a programmer. Either the dealer or some high tech independents will have the equipment. Average cost about $150.00.
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Wednesday, April 19th, 2017 AT 6:08 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,414 POSTS
Yes the PCM will need to be reprogrammed to correct the speedometer, shift pattern and engine management to match the new ratio.
Cost depends on who does the work so you would want to call a couple places to get an accurate price. I do not know of anyone who rents programming equipment, far to easy to turn a working PCM into a brick.
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Wednesday, April 19th, 2017 AT 6:09 PM

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