Gears
Gears Since I have a pro charger, will I gain much E.T. by changing gears in the rear end, and making boost faster, by getting in power band faster. Will I see much gain in my e.t.'s.
Yes. Superchargers like gears. 3.73 is a nice medium since it will rev nicely and still be very very streetable all around. Some pple go alil more and go 4.10's. Thats too much imho. It just revs way too high up there for my liking. Superchargers like gears because it takes RPM to make boost with most applications, so gears will get you boost=speed much more efficiently depending on the setup. 3.73's for a street car and 4.10's if you like shifting every split second like a maniac 
For 700 hp 4.10/4.11's will work if you have a 28" tall tires out back and have the rev limiter set a little higher than stock. For 26" tall tires I would go with 3.70/3.73 gears, and I hope you don't still have the 10 bolt rear. Bob
Just FYI, I have a D1SC set up that makes about 675 rwhp on a 402 6.0L with an M6. Keep in mind I drive may car on the street as much as I can. I have a 3.73 gear and it is perfect. It all depends on how much you plan on racing the car and how much you plan on driving it. Good luck.
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Traction is something else to be considered. Most guys I know that are N/A and have 4.10's can't hook up worth sh*t, let alone if they put a blower on the car.
Assuming you have all the suspension goodies and can get traction in 1st gear for whatever gear ratio, I would say a bumping from the stock 3.42's to 4.10's might net you an ET gain of possibly up to .3, however you need to also take into consideration about the possible time loss you will have by shifting into 5th with 4.10's. My car has 614 RWHP and I am running 3.73's. To my knowledge, I am one of the few (if not one of the only ones) that can still hook up with street tires (drag radials) in first gear on the street with that power level and those gears. I am able to wind out 4th gear to about 7,000 RPM which puts me at 132 MPH in the 1/4 mile, so I don't have to shift into 5th. However if I had 4.10's I know I wouldn't get the traction I do, and would definatly have to shift into 5th, which would further slow my times.
If I had even more power, I'd probably stay with 3.42's or if I had a shload of power I might even run a 2.73 gear. It all depends on your setup, your power level, and what exactly your looking for by changing the gears.
Assuming you have all the suspension goodies and can get traction in 1st gear for whatever gear ratio, I would say a bumping from the stock 3.42's to 4.10's might net you an ET gain of possibly up to .3, however you need to also take into consideration about the possible time loss you will have by shifting into 5th with 4.10's. My car has 614 RWHP and I am running 3.73's. To my knowledge, I am one of the few (if not one of the only ones) that can still hook up with street tires (drag radials) in first gear on the street with that power level and those gears. I am able to wind out 4th gear to about 7,000 RPM which puts me at 132 MPH in the 1/4 mile, so I don't have to shift into 5th. However if I had 4.10's I know I wouldn't get the traction I do, and would definatly have to shift into 5th, which would further slow my times.
If I had even more power, I'd probably stay with 3.42's or if I had a shload of power I might even run a 2.73 gear. It all depends on your setup, your power level, and what exactly your looking for by changing the gears.
Last edited by CALL911; Jan 24, 2008 at 05:18 PM.
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Traction is something else to be considered. Most guys I know that are N/A and have 4.10's can't hook up worth sh*t, let alone if they put a blower on the car.
Assuming you have all the suspension goodies and can get traction in 1st gear for whatever gear ratio, I would say a bumping from the stock 3.42's to 4.10's might net you an ET gain of possibly up to .3, however you need to also take into consideration about the possible time loss you will have by shifting into 5th with 4.10's. My car has 614 RWHP and I am running 3.73's. To my knowledge, I am one of the few (if not one of the only ones) that can still hook up with street tires (drag radials) in first gear on the street with that power level and those gears. I am able to wind out 4th gear to about 7,000 RPM which puts me at 132 MPH in the 1/4 mile, so I don't have to shift. However if I had 4.10's I know I wouldn't get the traction I do, and would definatly have to shift into 5th, which would further slow my times.
If I had even more power, I'd probably stay with 3.42's or if I had a shload of power I might even run a 2.73 gear. It all depends on your setup, your power level, and what exactly your looking for by changing the gears.
Assuming you have all the suspension goodies and can get traction in 1st gear for whatever gear ratio, I would say a bumping from the stock 3.42's to 4.10's might net you an ET gain of possibly up to .3, however you need to also take into consideration about the possible time loss you will have by shifting into 5th with 4.10's. My car has 614 RWHP and I am running 3.73's. To my knowledge, I am one of the few (if not one of the only ones) that can still hook up with street tires (drag radials) in first gear on the street with that power level and those gears. I am able to wind out 4th gear to about 7,000 RPM which puts me at 132 MPH in the 1/4 mile, so I don't have to shift. However if I had 4.10's I know I wouldn't get the traction I do, and would definatly have to shift into 5th, which would further slow my times.
If I had even more power, I'd probably stay with 3.42's or if I had a shload of power I might even run a 2.73 gear. It all depends on your setup, your power level, and what exactly your looking for by changing the gears.
I'm running a D1 at 7psi on a stock bottom end. When the car was M6 w/4.10s it trapped about 126 at 6500 on 28in tries. Changed to a TH400 - still w4.10s, 28s & trapped 126 at 6950, a little too much RPM IMO. Changed to 3.50s still 28s & it traps 129 at 6100. Didn't slow the car one bit, in fact it got quicker & I'm not over-reving it anymore.