Gearing and MPH question

[SolarFlare]

I have an 6r80, Procharger and 3.55s revving to 7000. Anyone know how to calculate the top speed in 3rd and 4th gear? And what would those 2 speeds be with the temporary 265/40-18 ET street SS Im rocking now. Thanks

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[TooSoonJunior]

Here are your gears:

Stock GT and V6 Auto ratios:
4.17
2.34
1.52
1.14
0.87
0.69

Your current tire is 26.9" assuming you made a typo and are running 285/40/18, they dont make a 265/40/18.

Go nuts here: http://www.wallaceracing.com/calcmph.php

EDIT: Updated the link to the correct calculator

 

[SolarFlare]

It is infact a 265/40-18

 

[SolarFlare]

well, unless I'm doing something wrong I put in...

Rpm 7000
Rear gear 3.55
Tire height 26.35
Trans gear 1.14 (4th)

I get 135mph. So it shouldn't shift to 5th at the track.

 

[TooSoonJunior]

Interesting must have discontinued that size, they don't list them anymore.

I am not familiar with your mods, but what you calculated looks right.

 

[EFI]

well, unless I'm doing something wrong I put in...

Rpm 7000
Rear gear 3.55
Tire height 26.35
Trans gear 1.14 (4th)

I get 135mph. So it shouldn't shift to 5th at the track.

135 is correct for that combo.

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