NewOrleansLT1

Anybody with a 4L60e went from 3.73 gears to 4.10 gears and noticed a difference in performance?? I run a 275/50/15 tire out back and been thinking about making the swap to pic up a few mph in the quarter..

HioSSilver

iTrader: (8)

You're better off with the 3.73 gear.

BALLSS

4:10's with a 4L60E.....for a track only car. Fwy speeds can be high RPMs with 4:10's but some have them

IMHO
auto 3:73
T56 4:10's

NewOrleansLT1

Well the car is a weekend toy.. I do very little highway driving.. I'm just wondering if it'll pick up some in the quarter. Just trying to see if it's worth it. The car run high 11.3X's at 119mph in good air.. Trying to get it in the 11.2X's or 11.1X's

jrwilliams95z28

I am interested in this thread. I am looking into either 4:10, 3:90, or 3.73 gears for my m6 from stock 3.42.
mostly street driven, autocross and odd 1/4 day.

jrwilliams95z28

from what i read it depends on your mods, because yes 4:10's are faster but might screw up what gear you finish in. maybe not for auto though.

speed2b

I have a 1995 z28 4l60e I went from 3.42 to 4.10 it made a big difference my trans was built for it . First day I got them in I put nitto 555R on and bent an axle but after that it was a blast . This's my toy it would suck as a daily driver but red light to red light it's a sleeper a lot of fun and a handful and you need to invest in a heavy duty trasns mount

bfd811

4:10's if its a true street/strip car otherwise i'd go with 3:73's or maybe even 3:90's

Cajun ELESS-ONE

iv got 4.11s in mine. the acceleration is real nice. on the highway the rpms are pretty high. getting the trans rebuilt right now

HioSSilver

iTrader: (8)

3.90's are great. 4.10's are to much....even for me and I spin it to 7000rpm.

You guy's need to match your gear to your tq curve/rpm range/speed you want to attain. More gear does not = better.

bfd811

This is the truth

NewOrleansLT1

My limiter is set at 6600. My car made peak power at 6200 and held flat till 6500 where we stopped the pull. I shift at 6400. That was with mid tubes. Torque was peaked around 4500/4700 somewhere in that range.. I now have long tubes and haven't redynoed yet.. But I'm sure all the peak numbers went up higher in the rpm range..

nitrous2fast

iTrader: (2)

I went from 3.23 to 4.10 and saw a huge difference. But I also shelled two sets of 4.10's. I moved to 3.73's and love the good use of torque. With the 4.10's on the street it would blow thru the tires unless running on DR's or slicks; even then it might. I am thinking about switching to 3.90's. But I love to spray so the 3.73's make better use of the added torque.

Cajun ELESS-ONE

when i raced a buddy of mine who has a full exhaust/lid/tune 01 ss 6speed, i got the jump by a car from a 20 roll. just drop it in 1st or 2nd (depending on speed) and hit it.

4K+Converter

The old racer trope is to match the rpm you'll cross the finish line at while in your 1:1 gear to your rear gear set (and tire height).

Google "fbody gear calculator." Dump in your numbers and see if 4.10s are worth it. I've seen a few guys run 4.30s or 4.56s, depending on the combo.

HioSSilver

iTrader: (8)

I always thought the old timers like to run out of gear about the 1000' mark for best et. But that don't make a very nice street car gear typically.

ThoR294

iTrader: (6)

I've got 3.73s with my T56, debating on 4.10s if i need a rebuild. very good info in here

pancho toco loco

iTrader: (8)

4.10's here and love them. Buddy of mine with a similar setup and a smaller stall 2800 vs my 4000. Lost .1-.2 and 1-2mph when he went down to 373's but this was on a 27in tall tire and few different tracks, different days, you get the point. but it was a solid .2
I have no problem driving my 4.10's on long trips, I just cruise at 65-70 with the occasional 80mph. The motor is well within its operating range, mpg may suffer and if your exhaust doesn't do much muffling it can get old.

HioSSilver

iTrader: (8)

^^^Funny.....cause me and a bud got his 3.73 geared mild bolt-on m6 Z28 to go 11.9 @ 116.x. A full .4 faster than you 4.10 geared car with 9mph on top. With a .25 worse 60'.

Jake99

iTrader: (2)

Few things to consider, lower gear makes your converter tighter so to get the full affect you would need to get the converter loosened up a little. Also most old school guys runs 350 or 400 trannys which have a much taller first gear then the other gears are closer together so they gain more with getting a shorter gear cause them with 4.10s is like us with 3.42s in first. I still kind of want to do it to mine, I don't think there will be much et gain but short gears and tighter converters are much more fun to drive