GEAR VENDOR OVERDRIVE

Hey Fred,
I was told by GV that you can't have the power going into the unit on the outshift. That is to say you can put full power into it on the upshifts; as in from first into 1-od or from second into 2-od, etc. But when going from 1-od into second, the power has to be interrupted until the box has outshifted. And as you have discovered,that control module has a time-delay in it, so that really sucks.
<< You might want to call them and verify that this applies to automatics, too>>

Here are the ratios;...... 2.45-1.91-1.45-1.13-1.00-.78od (GV in red)
and the splits;............... .78---.76---.78---.88---.78
So that looks pretty good.

Say you have 27 in tall tires,
and your power peak is at 5200, and your shift rpm is 5500, just saying.

>If you gear this to hit peak power at 60Mph, in 1-od, you will be blazing fast.
This might be 3.73s,for 60=5565, or 3.91s for 60=5850,or 4.10s for 6130
>Say your combo can hit 88 in the 1/8. The optimum overall ratio might be 4.79. So if you were to hit it in 3rd gear, you'd probably use 4.56s or 4.88s. In second you might use a 3.23 gear. And in 2od, you might use 4.30s
>Say your combo can hit 106 in the 1/4 mile. The optimum overall ratio might be 3.98. So if you hit it in Direct, you would use 3.91s, or maybe 4.10s. To use second-OD, you would use 3.55s. To use Third-od you would use 5.13s.

So as you can see, there is no one-gear that will cover all the bases. But 4.10s do a pretty close job. With 4.10s your Rs would be;
60=6130 in First-od
88=5323 in Second-od
106=5670 in Direct
65=2582 in Direct-od at zero-slip, 2700 at 5%slip,

As you can see, the GVOD can be used, very successfully in 3 out of 4 cases, always as the final shift, never as a splitter....And it's always nice at the top of the track,to have one more gear to shift into.