Got 4.10s, speedo is off-Need some help.

Finally! I got the 4.10s in the car. It feels good, but of course I can't get on it yet because of the break in period. I'm really eager to try out a WOT charge!

I have an auto and a diablosport tuner. I tuned the car's axle to the 4.09 setting, but I am almost positive the speedometer is still off. Why would it still be off? I thought the 2003 cars would tune the speedo with a diablosport.

Thanks for the help!

I think my speed is still off!

crew_dawg16 said:

if you flashed the computer for 4.09 then your speedo should be right on.

Gears DO have a break in period of about 300-500 miles. You should drive them a good distance and then let them cool off then you can really start to get on them.

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Well, I definitely flashed the car at 4.09. It does not feel right at all though as far as speed and the car. I could just be so used to the old RPMs and the speed matchup that it's just difficult to get used to, but I am doubting it.

I used the Factory HP tune instead of the Diablo tune to do it. Maybe I should try the Diablo tune instead. The reason I didn't want to do that though is because I drive a lot and don't want to have to put 93 gas in with the price it is. I put the mid grade in right now because my car will pre-ping at WOT on the 1-2 shift with anything less stock. It didn't do that until about 17,000 miles.

If worst comes to worst, I'll either drive behind someone that I know is going 55 and see where it matches up, or I'll get lucky and see one of those "Your Speed" police radar guns around somewhere I can match it up to.

Anyone else got any help for me? Can you think of anything I'm missing?