Jump to content

Need a tune if you change tire diameters


CRSilverado

Recommended Posts

I know you would need a tune to bring the speedometer in correctly. But assuming you don't tune for the different tire diameters, leaving the speedometer incorrect, would the shift rpm remain the same? This would be a one time change maybe at the track just to see what the truck will do with traction and an equivalent lower gear. Not sure on the trucks where the ECM gets it reading for shifts.

 

I have some drag radials that are 25.4" in diameter, my truck has 29.84 diameter tires. These tires would give an equivalent 4.018 rear differential.

Link to comment
Share on other sites

Speedometer, ABS and TPM sensors would definitely go into a tizzy. That wouldn't have any bearing on power to the wheels. Not too sure about shift rpm. It should follow the speedometer making shift rpm the same even though not the correct speed. But I'm guessing. Just wonder if anyone has actually tried without a tune. Don't want to void this 5 year warranty. Not just yet anyway!

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.