Question for those running 120+mph traps.

I dont really understand the purpose of adding a 3.50 final to 3.77 gears.
It ends up making your 4th gear very very lazy.

What about running a 3.77 or 3.85 final drive in a 3.50 gearset?

That takes a 7000 rpm 4th gear from 154mph (27" slicks, adding some growth to 26's..probably not enough added) to 140mph

On 25" slicks (24.5 growing probably much taller then 25" though) 143mph becomes 130mph.

With big slicks we have the problem of tire growth in 4th gear so a 4th gear that is lazy on a 24" tire becomes dead on a 26" slicks that is probably growing to 28" inches in all reality.

Are people really so sure that gearing down for short track helps enough to be worth killing the top end? Are short gear gains even proven on the short track?
Unless you are trying to extend 3rd gear so far that you never have to use 4th.

The most I can see out of that is 139mph with a 26" slick growing to 28" (narrow rims) and 7500 rpms. So maybe for those reving to 8k there is room but......
28" tire would be needed for most people looking to go faster (30" grown or more).
I sorta doubt I can rev over 7000 safely and 28" slicks are out of the question so I would never be able to go faster then 130mph in 3rd on a low gear hybrid trans.

With big slicks, I dont know if the hybrid trans would even help..maybe more of lag enducer.

I would have to make 600whp to make a stock gears 3.77 trans useful in 4th gear on 26" slicks.