donnie brooks

Got a question..I have a 99 vert..6 spd that registered 430 rwhp..at the time I had 3:90 gears..now that I have the 3:42 gears back in the car..will my readings stay the same as far as rwhp and torque..any input would be appreciated?
Thanks

pit-man

The 342 gear will read higher dyno numbers but I doubt nothing to even think about

tweeter81

I'm pretty certain it will dyno the same regardless of gearing because all dyno runs are done in 4th gear, which always have a 1:1 gear ratio.

zeevette

The axle ratio will still change the gearing, regardless of using 4th gear for dyno pulls. I have no experience re-dynoing after just changing rear, but I've read that it does make a small difference in numbers.

NukeC5

Yes, the rear end will change it. Even in 4th you're still going through the new rear end ratio. Should read higher by a little. But as was said, nothing to get a boner about.

VGLNTE1

jb35007

do you still have the 390 ring and pinion??? also what was your cruising rpm at around 70mph??? i have a 01 6spd and was thinking about changing out the gear ratio to get some extra light to light response but would like to keep my mpg on the hwy