roadtrip120

iTrader: (29)

I realize alot of things factor in for this decision.

Bolt on only car, going for low 12's with a M6

Which gear will help 60ft?

I am trying not to bog like i am now with 3.42's

Which gear will help total quarter mile time?

I need the Et's to drop considerably.

Keep in mind i will only have around 320rwhp and i need to pull 1.6 60fts.

Any helpful info please, i know alot of people run the 4.10's so they will probably be more popular.

thanks Roadtrip

DietCoke

iTrader: (18)

4.56 is a lot of gear, you may be happier with 4.30s if those are available for a 10 bolt.

METALBEAST

iTrader: (1)

4.10s should be more than enough gear. Your problem is going to be in your suspension.

Elysian

With an otherwise stock motor, unless you want to shift into 5th before finishing the 1/4 mile, I wouldn't go higher than 4.11's. With 4.11's, 108mph comes up in 4th gear at 6500rpm (which, unless I'm mistaken, the stock LT1 computer can't rev that high); with 4.56's, 98mph comes up at 6500rpm. And the dude is right about your suspension - work on that first. A good suspension is just as important to '60 times as gearing. After that, get some sticky tires. To be quite honest, I wouldn't invest much $$$ in that 10 bolt - especially since you're an M6. Any traction you get is going to be taking years off its life.

stik6shift93

at 5700(redline) in 4th you'll max out at 106 with 410s, you'll max out at 98 with 456s at the same rpm.

2MuchRiceMakesMeSick

4.10 in a 10 bolt with a 6 speed =
of course any gear steeper then that will just propell the

dhdenney

iTrader: (53)

Steep gears are more for small motor, 1/8 cars IMHO.

-IH8RICE-

iTrader: (2)

I would think the 4.56's would be considerably weaker than the 4.10's. I say go with the 4.10's and work on the suspension.

roadtrip120

iTrader: (29)

Thanks for the info, i think 4.10's will be on the list

5432LT1

why dont you just save the money and buy a complete 12 bolt and pick whatever gears you like...because ive got 5 bucks that says yourE* gonna need it anyway.

2MuchRiceMakesMeSick

Make that 20 But seriously, you may want to consider a 12 bolt or 9" rear end

roadtrip120

iTrader: (29)

I thought the 9" weigh alot? True they are stronger and i wont have problems. But i am low budget racing right now. 4.10's and a locker should work fine for now. I will up grade when she goes.

Thanks for the help

Gangly

with the little power you have, you can run 4.56's safely, even with a 6 spd tranny despite what many people think. with 4.11's or 4.56s, your gonna need to run an ET Street with the 6 spd and since you are gonna be running a taller tire, go with the 4.56's, your mph wont be affected as much with the taller tire so you can be relieved about that. your PCM can handle 6,800 or 7,200 rpm i think, cant remember which, but i might be mistaken, will have to look again tonight. suspension will be a big issue though. with those gears(4.11's or 4.56), you will get wheel hop because being an LT1, your shocks are old, torque arm is weak, and bushings probably on their last leg. if you plan on doing power mods later on, go with the 4.11's, but if you plan on staying with your current power levels and trying to run low #'s, you wont have any problems with a 4.56 gear breaking. wait till your about 375 rwhp before having to worry about breaking the 4.56's, and thats only if your still using the stock 10 bolt.

Elysian

I have my rev limiter set on 7200rpm; control it more precisely with the MSD6AL.

Race Car Driver

I installed 4.11s in my T56 LS1 and they work well around town, and they make 6th gear much more useable. I wouldn't go any lower.

Elysian

4.11's are a compromise between a highway and a race gear, IMO. With headers, cam and an exhaust, things start to drone around 65-70mph or so. Can get kinda monotonous for highway driving. Depends on what you want the car for.

2MuchRiceMakesMeSick

9" shipping weight is 199lbs
12 bolt shipping weight is 191lbs
10 bolt is around 150-160

I guess 8lbs is alot

atljar

iTrader: (2)

I ran 4.33s in a 12 bolt during bolt on days with 26x11.5x16 ET streets and always did fairly well. Car had opti issues and fuel pump issues, so only trapped 102.xx, but i did manage 13.1 with those traps so the car was leaving hard.

On the ECM issues....
obd1 computers crash out if you hit 7k
obd2 computers will run past 7k, but how the tables are set up, you need to do some major tuning on the dyno to get them to run well up there.

roadtrip120

iTrader: (29)

Well 160 to 190 is a lot. Thats what i ment. I didn't know the weight of the rear ends.

Thanks for the info, might as well but the 9" .

2MuchRiceMakesMeSick

Not really, when you consider how much harder you can beat on a 9". Clutch dumps at 6k on slicks should make up for the difference