70 LS1

iTrader: (1)

With 4.56's, will I even use 1st on the street?

NC Guy

Only going up a very steep hill or to impress teenagers with a huge, smokey burnout.

Enjoy your cars.

ChrisB

I have them and use it all the time - why not? Remember our six speeds only have a 2.66 first gear, so it's really not at all that crazy. It's actually *less* gearing than a mustang (3.36 first?) with 3.73 rear gears.


It's about the same as an a4 f-body with 4.00's (a hair less).

Highway gearing is awesome, at about 2200 at 70.

As for *traction* in first gear that's a different matter - it depends on your suspension, tire, and power level.

Chris

LS1derfull

I am a quarter mile freak, so 4;56's are speaking my language, but I just want to mention:
1. remember driveshaft speed is astronomical over 100mph (dangerous)
2. use only synthetic rear end lube to keep gears from overheating
3. ring and pinion with 4;56's is weaker than with for example, 3;42's
I imagine 4;56's would be easier on clutch and tra
ns(wheelspin would lessen shock, and load)
I hope this is helpfull info.

BIGBOS

I think its too much gear if you plan on driving it all over the place...if its strictly a track car thats fine...but if you want good acceleration on the street and the track and not be bothered by the dangers do a 4.10/4.11

ChrisB

And what would the "Dangers" be of a 4.56 gear? What makes it a track only gear?


Chris

BIGBOS

The driveshaft spins a lot faster...thats one of them, they break a lot easier too...

70 LS1

iTrader: (1)

Why would that be OK for the track but not the street? I don't go driving around town at 100 mph. If they are good enough for the track, they are good enough for the street. At least the way I drive, the street is less demanding on my drivetrain. Maybe I am doing something wrong.

BIGBOS

Its not a bad thing to run them on the street, I would if I wanted to, but I don't want to...

Pro Stock John

iTrader: (34)

4.10's in my old 98SS M6 made 2nd gear feel like 1st gear with 3.42's.

I had a buddy with 96Z M6 had 4.56's. He could roll out in 3rd.

No biggie.

I have 4.10's in an A4. <img src="gr_stretch.gif" border="0">

ChrisB

[quote]Originally posted by BIGBOS:
<strong>The driveshaft spins a lot faster...<hr></blockquote></strong>

So we should all run 2.73's then. Yes it spins faster, but what makes it suddenly "dangerous" with 4.56's?

I wouldn't run them with a stock driveshaft - but then if you are taking advantage of them the stock driveshaft won't last to long anyway <img src="gr_images/icons/wink.gif" border="0"> . My Denny's driveshaft is balanced to 9,0000 rpm - I can assure you I am coming no where near that - and there are much fancier driveshafts than what I have.


[quote]<strong>
thats one of them, they break a lot easier too...</strong><hr></blockquote>

Oh? Where they going in a stock rear? I wouldn't bother with that - but then, I wouldn't bother spending any money on a stock rear. I don't think my ford 9" mud paddle gears are in any danger at my power level.

[quote]Its not a bad thing to run them on the street, I would if I wanted to, but I don't want to...<hr></blockquote>

No one is suggesting you should - the response was because you intimated they were dangerous on the street, and by fiat declared them fit for track use only in your previous post.


Chris

LS1derfull

70LS1 with a mild LS1 and 4;56 gears you would probably need 5th gear in the quarter mile. I dont know about you but I dont think powershifting into 5th is a good idea! Thats how I race so thats important. Using 4;56 on street would make first gear pretty useless. Dont want you to waste your time and money to be unhappy.

Pro Stock John

iTrader: (34)

Let's also keep in mind we can go up in tire size too.

I have run 28's before and it drops my rpms thru the traps like 300-400 rpms.