LSTSS02

Can someone give me some feedback about switching from a 3.42 to a 4.10 (M6 car).......

What kind of gains did you see and how did it change your RPM on the highway?

I know there are formulas to give me an idea but I would like actual #'s.

Thanks!!!!

ls1wannabe

iTrader: (2)

my friend put one in his ive been in it just to tell you ur in 4th gear in the subs and it pulls in 4th and on the highway 6th gear is like a overdrive gear rpms arent that high but in the lower gears your in and out real quick as far as gains i'd say two to three tenths in the 1/4 mile

89lx-ls1

iTrader: (23)

With only 410's in my 99 camaro i went from 8.71 to an 8.53 with evrything else stock and i did great on the interstate

mellowyellow

iTrader: (11)

ok at 70mph i'm doing 2000rpm .45mph i'm in 5th gear . 3rd to 4th gear it pulls like a mother f**ker . I would do it over and over again. Any other specific ?'s just ask...

Judd

iTrader: (1)

Went from consistant 13.0-13.10s to a 12.60 with an UD pulley and 4.10 gears. Here is a pretty good gear calculator- http://www.f-body.org/gears/

LSTSS02

Thanks for the information, much appreciated! Another question.....at the track does would it finish in fourth? Approximately what RPM?

Thanks!!!!!!!!

ace68

iTrader: (15)

4th going through the traps at 6100- 6200

777

iTrader: (21)

I went from 3.73's to 4.10's My rpms at 80 went from about 2100 to 2400

Judd

iTrader: (1)

I have pulled 116mph in the quarter. If you take a look at the F-Body gear calculator, you will see that I finish the 1/4 mile at around 6200 or so rpm. Bout perfect sice my rev limit is 6400.

If you now your mph in the 1/4 mile, just fill out the calculator for your tire size and gear. Then submit it and look in the forth gear column for your mph and rpm.

If you ever get faster than around 120 mph in the 1/4 mile, you will either have to have a very high rev limit, taller tires or you would have to swap back to 3.73s. Remember that 120mph is something like low 11s in the 1/4 mile for most street cars.

LSTSS02

Thanks............so what would everyone suggest........3.73 or 4.10? I do not drive the car that much but also don't want to ruin the highway portion of it........

Judd

iTrader: (1)

You won't ruin the Hwy driving part feller. I suggest the 4.10s if you are going to do a gear swap. If you are not sure, go to the web site I gave you and plug some numbers in. I can cruise at eighty miles an hour at about 2000 rpms. Before I did a cam I was getting around 28 mpg with the 4.10s. What do you get with the 3.42s? Probably bout what I got, 28-29mpg at Hwy speeds. If that's excessive then go with the 3.73s I reckon. If anthing, 4.10s make driving in 6th gear more enjoyable.

LSTSS02

I have never checked my MPG.............don't really care about it........I just didn't want a screaming motor down the highway.

Thanks for the advice though........pretty easy decision to make. 4.10 it is!