did you notice it much? what kind of rpm increase was there at hwy speeds?

gas mileage drop much?

 

Your RPM and your rear wheel torque will increase by 5.8%. Doesn't seem like a whole lot, but you should be able to feel it. Currently you should be about at about 2,075rpm at 70mph in O/D. The rpm will increase to 2,200.

 

which on a stock 3.4 auto would equal roughly a 9ft-lb increase in torque

 

I did it on my 5-speed 3.4L I noticed the differnce by seat of pants and times...

worth it in my opinon.

 

any mileage decrease???

also at the crank it would be a 12ft-lb increase over stock

 

I wouldnt bother with it . Too little of an increase for all the work and money involved.

 

i went from 3:23 to 3:73 to 3:42. didnt really notice much change on the first swap, but i never had an equal field to judge as i never got traction with the stock gears. but for the amount of highway driving i was doing the 3:73 turned more rpm's then i liked. so i went with 3:42. they do tons better on daily driving, but have not been to the track yet. as far as SOP testing i didnt notice much change in the 3:23 and 3:73, as i had spinning problem with both. but with the 3:42's they feel possibly a little bit slower off the line, but not really noticable. but the car is in the power range a little bit longer and actually feels a bit quicker in the mid range, like passing gear and such.

to sum all this up, if you dont mind running 2500 rpm at 70 and have sticky tires then 3:73 are cool, if you want a good middle of the road gear 3:42 are cool. you get a little more kick on the line and you can still run 75 or 80 without winding your car up to 3000+ rpm. i never really noticed milage differance in any of them. but then again with the cam i have if i go any higher gear i will get a ton of surge at hwy speeds.

 

with what we have planned it would be more work keeping 3.23s

i'd say 9ft-lbs to the ground is a significant increase, esp on a V6 car