to be honest it wont be much of a difference between those two really... theyre both gunna rev high in normal hwy driving if you use it at the strip as long as you dont max out a gear just before the line with the 3.9's then it would bo ok, otherwise go the 3.7's... anyone here with a 5ltr stato that has tested these gears?
no worries mate,i dont do a great deal of hwy driving but i dont really like the idea of the gears reving out real quick,obviously 3.9s r gonna rev out quicker so thats y im leaning towards 3.7s.but is there a massive difference?any help would be great cheers.
Ive got 3.9s in my blown clubby, but its manual so its a bit different.
And im going back down to 3.45s. 3.9s were great for n/a but now with the blower, it revs out too quickly