LASTOFTHEBREED02T/A

iTrader: (15)

Im gearing the rear end... And want to know what was the performance diffence from stock gears. 1/4 gains, ET, Trap. And never the less...

Top End!?

I8UR4RD

iTrader: (16)

I picked up a .2 tenths going from 3:23's to 3:73's without my converter. it was not as good on gas on the highway. 2700 rpm at 70-75 ish id say. been a while since i drove it.

LASTOFTHEBREED02T/A

iTrader: (15)

Did you ever try top end?

Thx, for posting!

senicalj4579

iTrader: (41)

I just had 3.73 installed along with heads cam intake. The car is a beast is all I can say right now. Im still getting used to it.

RPM WS6

iTrader: (3)

Do you currently have 3.23s? If so, ET reduction from a 3.73 swap with the 3800 stall already in your sig will be limited to about 1 tenth.

LASTOFTHEBREED02T/A

iTrader: (15)

I do have 3.23s... So gear swap will not be too beneficial? And Top end is sacrificed. right?

SexyTransAm

iTrader: (6)

4.10s or more dont be a *****. 4.56s FTW!

TyCZ28

I had 3.73 in my 97 z28... with the longtubes ORY and cutout open it was a mean SOB... i could roast the hell out of the tires at will. The Butt-O-Meter approved.

deez01ls1

iTrader: (2)

I just had 373's installed..its a big time accelerstion improvement over the 273's...im also getting used to them

RPM WS6

iTrader: (3)

3.23 to 3.73 swap isn't worth much in the way of ET reduction once you have a 3500+ stall. Some of the people responding who have done this swap seem to still have stock stalls, which is entirely different than doing the swap with a 3800 stall already in place. Unless you need a new rear anyway, or are able to do the labor yourself and only pay for the gears, it's not worth the cost IMO. But if you're running out of other things to do and you want every last ounce of ET reduction, or if you don't like the street manners of the 3800 stall and want a "tighter" feel around town, then this could be a good option. Don't expect significant gains though. Even a 2.73 to 3.73 swap isn't worth much in the way of ET reduction with a 3500+ stall already in place.

Yes, top end will be reduced some with the 3.73s, but you'd still be able to hit around 130mph at ~6500 rpm with a stock tire diameter in 3rd gear (much higher if your trans can handle a WOT upshift into OD).

You will lose MPG with the 3.73s though. Not a huge difference, but there will be a loss. Just something else to consider.

TyCZ28

Cheaper solution... Find a rear end out of an M6 car with low miles and 3.42's you might even be able to trade...

RPM WS6

iTrader: (3)

3.23 to 3.42 swap would be almost imperceptible in terms of performance improvement, and even if you find a great deal on the axle and install it yourself, there will still be the cost of a retune for shift point and speedo correction (unless you have your own tuning software).

But I understand your reasoning, and think this would be (and is) a good option for 2.73 cars that want more gear.

bww3588

iTrader: (49)

With 3.23's, like rpm said, I wouldn't mess with it unless you can install them yourself. If your paying someone, it would be no where near worth the cost involved. Save your money for a 9 inch and worry about gear ratio then.

00MaroonZ28

iTrader: (3)

Wouldn't recommend doing the 4.10's or higher if it's a DD car. I'm doing 2500 rpm's at 70 in mine. The get up is nice but not fun when cruising down the highway. Gas mileage suffers.

TXZ28LS1

iTrader: (5)

I noticed a huge performance feel going from 2.73 to 3.73. I also had a 3200 stall and then swapped to a 4000 stall. I loved it..

I sold that car and now looking into another fbody with 3.73.. But my car wont really be a DD so im wondering how a 4000 stall and 4.10 gears in an auto will perform.

ULTIMATEORANGESS

iTrader: (4)

lol i agree. i like having 4.10s. it sucks gas but i dont care it compliments my setup perfectly but im nowhere near stock.

FirstYrLS1Z

iTrader: (4)

Had 4.56s' A4 for 4 years,just recently went back to the OEM 3.23s'. 1st & 2nd were wicked,mpg was good and freeway running was OK. Damn,I miss those 4.56s',but the 4.56 rearend is complete so I can put it back in anytime.

whitess1

iTrader: (2)

In my opinion if ur trying to better ur 1/4 mile times would look at converters o went from 2.73 to 3.73 picked up 2 tenths added a yank 4000 ss picked up 4 tenths more car still drove good on the street but I know every set up is different. Good luck

usnfenix

iTrader: (11)

no not in your position

and how often do you exceed 130mph anyway.

00MaroonZ28

iTrader: (3)

I really liked my 3.73's when I had my 10 bolt. Good on the highway and still had good get-up. I'd do the 3.73's for a nice street car. You can really roast the tires with the 4.10's though which is fun and you do notice quicker acceleration. Just not a fun highway car.