513camarors91

iTrader: (5)

im about to order a s60 rear end and im having a really hard time trying to figure out what gears to get. i have a ls1 t56 in a 91 camaro. i have heads cam ls6 intake making 412hp and 400tq to the wheels. its not my everyday driver. i want it to be a good all around gear which i know you cant have both. it would mainly be driven on the street but would see track time as well.let me know what you guys have or what you recomend. and i plan on building the car more once the rear is in and money comes around. i heard ppl like 410s with a t56 but i also heard that they spend alot more time shifting gears just driving around. thanx for the help ahead of time. so 373 or 410?

solidws6

i run 4.10's in my s60. 2001 ws6 t56(ratios-2.66, 1.78, 1.30, 1.00, .74, .50)
bolt-ons/cam/weight reduction/315 mt dr. tooling around town i'm easily in 5th sometimes 6th. i haven't topped it out yet. in town speeds are 40-55mph. freeway speeds are 70-85mph. i shift alot more when cruising around but when it's time to goose it....it hauls *** for the power it has. freeway pulls are good. digs are where it's @ though. keep in mind- it takes more power to turn a dana 60 compared to other 3/4 & 1 ton setups. i believe it's due to the location of the ring to pinion contact(not sure though). off subject-i come from the rock crawling crowd where 9's & 12 bolts implode on a regular basis. in that arena, it's d60/d70/ford 10.5/14bolt or leave it on the trailer. haha

513camarors91

iTrader: (5)

i forgot to mention that i have a mn12 trans out of a 04 gto so the gears are already alittle bit steeper than a f body trans....anyone else?

513camarors91

iTrader: (5)

my mn12 trans ratios are alittle steeper than urs 2.97,2.07,1.43,1.00,.84,.56. so i cruise mainly but i want it to pull hard wen i want it to. i think with the steeper gears 4.10 might be too much. anyone else want to chime in?

Blu99T/A

iTrader: (5)

I have 4.10's in my S60 and just cruising around 1st is almost not needed. Like stated earlier, when I hit the go pedal, I am glad I have the 4.10's.

high impact

iTrader: (5)

I have 3.73 and wish I had the 4.10 or even 4.56 with the t56. I will be switching gears some day soon hopefully.

LS1T56FTW

iTrader: (3)

OP, with the shorter ratio gears you have in your trans, I personally would run 3.90 gears. LS motors love 1 of 2 things - Nitrous, or really short gears. Both of which solve the 'high RPM requirement' that these motors have to REALLY move out. With your trans, 1st gear would only take you like 40MPH at 6500 RPM if you ran 4.10s. That is actually still longer than most Mustang setups (my buddy only gets like 35 out of his car since 1st is so short).

513camarors91

iTrader: (5)

you cant do 3.90 with the s60...you can only run 373 or 410. i know most of you run 410 with a f body trans with the less steeper gears but if i run them in the mn12 i think it might be to steep for a cruiser...i am going to the track but its mainly going to be a street machine

370ci_NBM_SS

I've got 3:73 with 450hp & 450tq to the wheels, t56, moves good, highway in 6th pulling about 1800rpms, on a side note you said that you are gonna build the car up more.....gotta plan ahead and figure out which route you are gonna go with, nitrous, turbo,etc. I plan on spraying these gears and when I switch to turbo i will be going to the 3:54. Spraying with 4:10s you will prob. Run out of gear before the 1/4. All tho they would prob. Make your combo feel real strong
Good luck

513camarors91

iTrader: (5)

i do plan on spraying down the road and like you said i dont want the 4.10 to run out of gear.. and i dont feel like swaping out gears again when i do.. thats why im trying to do it right the first time...thanx for you help....im thinking 3.73 are better to n20 or boost correct?

370ci_NBM_SS

3:73 are alot better than 4:10 for spray and boost. 4:10 and higher are more for n/a and 1/8th mile racing IMO. 3:73 will be good on the street and just hit n20 at the track

murphinator

iTrader: (2)

off your direct discussion a bit but pertinent : 373 with a shorter tire would/can be like 390's , 411 with a taller tire would also , fine tune your final ratio with tire height/rollout

513camarors91

iTrader: (5)

that good information to know i didn't think of it like that...

guppymech

iTrader: (7)

IMO NMB's advice is right on the money. If you don't want to change gears in the future then plan ahead with the 3.73s for when you spray it. 4.10s are great NA but you will need DRs to put the power to the ground on the street. You want to plan your gears for the MPH you'll run at the track through the traps in 4th gear, avoid 5th. There is a good mph/gear calculator at f-body.org that you can manually input your trans ratios into.
http://www.f-body.org/gears/

513camarors91

iTrader: (5)

the m12 trans which i have come in gto ctsv corvette z06....ive been seeing what those guys run in there cars or what they upgrade too.. ctsv comes stock with 3.73 land alot of z06 guys upgrade to 3.73...im not planning on n20 till down the road but im afraid of putting 4.10 in the car with a m12 and being way to steep to enjoy and drive on the street.i know it would be bad a$$ on the strip... i now have a stock 3rdgen 3.08 gear in it and i can blow the tires off of it now...so thats why im thinking 3.73 gears so it can be a good cruiser and still be good on track....i also plan on maybee auto crossing it and 4.10 prob would not be good for that...thanx for the help....

BOBS99SS

iTrader: (2)

4.10s in a 6 speed will put a smile on your face!

oldmano2z

here's my 2 bits an old crew member of dicky harrels told me once that it really doesn't matter what gears you have as long as you have the horsepower to push it. on the other hand. i daily drive mine @ 3.54 and have a blast on the street, but i realize a lot of you guys realy like the launch. more power to you . i decided my ratio by what i do (the street) 5 and 6 highway and with 3'54 the downshift is not so abrupt when dumping to 4th or 3rd on the highway. course the thought being 1/4 and 1/8 guys don't worry of down shifts.