i run a 3.90 rear end and enjoy shifting less. Its not too much of a difference on the lower gears, but on the higher gears i get 5-8 more mph per gear. Lots of things are different but I have kept up or beaten friends making more horsepower as i stay in a lower gear longer. Its all anecdotal, but still has some merit.

 

You guys also have to remember the stock reduction gears when factoring rear end final drive ratios.

AP1 reduction gear is 1.16:1
AP2 reduction gear is 1.20:1

So whatever your rear end ratio is, times by the above number for the model you have.

For example

A 3.9 rear end in a AP1 is effectively a 4.524
A 3.9 rear end in a AP2 is effectively a 4.68

 

I've debated about doing this so thing, so no:P I sold my 4.44 gears when I decided to go turbo and was always wondering if I should be shifting too much with the stock tranny and FD.

 

Aren't most ppg gearsets $$$ ?

I don't see a price.

 

Convert to a slushbox? Its a manual transmission... the ratios are close for a reason... its just part of the ride.

and changing gear ratios so that you can "stay in gear longer" only minimises the torque multiplier at your wheels, so technically, you'd be accelerating slower... but i guess you'd "be in gear longer" so maybe you'll feel faster? dunno...

I'd leave it the way it is, and learn to shift faster than your friends, so that you don't lose as much per shift

 

Depends on your power too. At 500whp+, the stock gearing is far from optimal.